From ca3e4d73a55608c7bf541a555e43f03dfa98e8cb Mon Sep 17 00:00:00 2001
From: Gandalf <gordon@i3omb.com>
Date: Sun, 14 Jun 2026 08:34:34 +0100
Subject: [PATCH] feat: implement telemetry persistence, data visualization,
 and improved bluetooth stream parsing with frame statistics (#9)

Reviewed-on: https://git.i3omb.com/gronod/esp32-aldl-android/pulls/9
Co-authored-by: Gandalf <gordon@i3omb.com>
Co-committed-by: Gandalf <gordon@i3omb.com>
---
 .github/workflows/release.yml                 |  56 ++
 .gitignore                                    |   1 +
 .idea/appInsightsSettings.xml                 |  26 +
 .idea/deploymentTargetSelector.xml            |   7 +
 .idea/gradle.xml                              |   1 +
 .idea/planningMode.xml                        |  11 +
 24_INT10_mod.adx                              | 786 ++++++++++++++++++
 LICENSE                                       |  21 +
 README.md                                     | 149 ++--
 app/build.gradle.kts                          |  12 +
 app/src/main/AndroidManifest.xml              |  10 +
 .../esp32aldldashboard/AldlApplication.kt     |  41 +
 .../example/esp32aldldashboard/Navigation.kt  |   2 +-
 .../bluetooth/BluetoothForegroundService.kt   | 136 +++
 .../bluetooth/BluetoothService.kt             | 190 ++++-
 .../data/database/SessionEntity.kt            |  13 +
 .../data/database/TelemetryDao.kt             |  31 +
 .../data/database/TelemetryDataPointEntity.kt |  47 ++
 .../data/database/TelemetryDatabase.kt        |  29 +
 .../esp32aldldashboard/logging/CsvLogger.kt   | 100 +++
 .../logging/RawStreamLogger.kt                |  98 +++
 .../esp32aldldashboard/parser/ALDLParser.kt   | 311 ++++---
 .../parser/DerivedTelemetry.kt                |  22 +
 .../parser/TroubleCodeDictionary.kt           |  36 +
 .../repository/BLMTableRepository.kt          | 122 +++
 .../repository/ChartPreferencesRepository.kt  |  96 +++
 .../repository/SettingsRepository.kt          | 205 +++++
 .../repository/TelemetryRepository.kt         | 144 ++++
 .../ui/blm/BLMTableScreen.kt                  | 229 +++++
 .../ui/blm/BLMTableViewModel.kt               |  32 +
 .../ui/charts/ChartParameter.kt               |  84 ++
 .../ui/charts/ChartsScreen.kt                 | 347 ++++++++
 .../ui/components/Gauges.kt                   | 125 +++
 .../ui/main/DashboardScreen.kt                | 511 ++++++++++++
 .../esp32aldldashboard/ui/main/MainScreen.kt  | 710 ++--------------
 .../ui/main/MainScreenViewModel.kt            |  44 +-
 .../ui/main/MainScreenViewModelFactory.kt     |  20 +
 .../ui/settings/LogFilesDialog.kt             | 137 +++
 .../ui/settings/SettingsScreen.kt             | 143 ++++
 .../esp32aldldashboard/ALDLParserTest.kt      |  97 ++-
 .../esp32aldldashboard/RingBufferTest.kt      |  27 +
 .../ui/main/MainScreenViewModelTest.kt        |  65 +-
 build.gradle.kts                              |   1 +
 gradle.properties                             |   1 +
 gradle/libs.versions.toml                     |  16 +-
 ksp_versions.xml                              | 169 ++++
 46 files changed, 4505 insertions(+), 956 deletions(-)
 create mode 100644 .github/workflows/release.yml
 create mode 100644 .idea/appInsightsSettings.xml
 create mode 100644 .idea/planningMode.xml
 create mode 100644 24_INT10_mod.adx
 create mode 100644 LICENSE
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/AldlApplication.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/bluetooth/BluetoothForegroundService.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/data/database/SessionEntity.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/data/database/TelemetryDao.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/data/database/TelemetryDataPointEntity.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/data/database/TelemetryDatabase.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/logging/CsvLogger.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/logging/RawStreamLogger.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/parser/DerivedTelemetry.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/parser/TroubleCodeDictionary.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/repository/BLMTableRepository.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/repository/ChartPreferencesRepository.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/repository/SettingsRepository.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/repository/TelemetryRepository.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/ui/blm/BLMTableScreen.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/ui/blm/BLMTableViewModel.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/ui/charts/ChartParameter.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/ui/charts/ChartsScreen.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/ui/components/Gauges.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/ui/main/DashboardScreen.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/ui/main/MainScreenViewModelFactory.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/ui/settings/LogFilesDialog.kt
 create mode 100644 app/src/main/java/com/example/esp32aldldashboard/ui/settings/SettingsScreen.kt
 create mode 100644 app/src/test/java/com/example/esp32aldldashboard/RingBufferTest.kt
 create mode 100644 ksp_versions.xml

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..e4632d6
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,56 @@
+name: Build and Release APK
+
+on:
+  push:
+    branches:
+      - main
+      - master
+      - v2
+
+jobs:
+  build-and-release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+
+      - name: Setup Android SDK
+        uses: android-actions/setup-android@v3
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v3
+
+      - name: Make gradlew executable
+        run: chmod +x ./gradlew
+
+      - name: Run Unit Tests
+        run: ./gradlew test
+
+      - name: Build Debug APK
+        run: ./gradlew assembleDebug
+
+      - name: Get Short SHA
+        id: vars
+        run: echo "short_sha=$(git rev-parse --short HEAD)" >> $GITHUB_ENV
+
+      - name: Rename APK
+        run: |
+          mv app/build/outputs/apk/debug/app-debug.apk app/build/outputs/apk/debug/esp32-aldl-dashboard-${{ env.short_sha }}.apk
+
+      - name: Create Gitea Release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: "build-${{ env.short_sha }}"
+          name: "Build ${{ env.short_sha }}"
+          files: app/build/outputs/apk/debug/esp32-aldl-dashboard-${{ env.short_sha }}.apk
+          prerelease: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.gitignore b/.gitignore
index aa724b7..0a2467a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,4 @@
 .externalNativeBuild
 .cxx
 local.properties
+.windsurf/workflows/gitea-interaction.md
diff --git a/.idea/appInsightsSettings.xml b/.idea/appInsightsSettings.xml
new file mode 100644
index 0000000..371f2e2
--- /dev/null
+++ b/.idea/appInsightsSettings.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AppInsightsSettings">
+    <option name="tabSettings">
+      <map>
+        <entry key="Firebase Crashlytics">
+          <value>
+            <InsightsFilterSettings>
+              <option name="connection">
+                <ConnectionSetting>
+                  <option name="appId" value="PLACEHOLDER" />
+                  <option name="mobileSdkAppId" value="" />
+                  <option name="projectId" value="" />
+                  <option name="projectNumber" value="" />
+                </ConnectionSetting>
+              </option>
+              <option name="signal" value="SIGNAL_UNSPECIFIED" />
+              <option name="timeIntervalDays" value="THIRTY_DAYS" />
+              <option name="visibilityType" value="ALL" />
+            </InsightsFilterSettings>
+          </value>
+        </entry>
+      </map>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/deploymentTargetSelector.xml b/.idea/deploymentTargetSelector.xml
index ca16a99..b9263f9 100644
--- a/.idea/deploymentTargetSelector.xml
+++ b/.idea/deploymentTargetSelector.xml
@@ -4,6 +4,13 @@
     <selectionStates>
       <SelectionState runConfigName="app">
         <option name="selectionMode" value="DROPDOWN" />
+        <DropdownSelection timestamp="2026-06-12T14:39:35.370192038Z">
+          <Target type="DEFAULT_BOOT">
+            <handle>
+              <DeviceId pluginId="PhysicalDevice" identifier="serial=38021FDJG009WV" />
+            </handle>
+          </Target>
+        </DropdownSelection>
         <DialogSelection />
       </SelectionState>
     </selectionStates>
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index cdbc250..02c4aa5 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
diff --git a/.idea/planningMode.xml b/.idea/planningMode.xml
new file mode 100644
index 0000000..8b57a96
--- /dev/null
+++ b/.idea/planningMode.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="PlanningModeManager">
+    <option name="approvalStates">
+      <map>
+        <entry key="20260611-222122-a9e9a066-af5b-42dc-aff4-518967db385e" value="false" />
+        <entry key="736035b4-cfea-4311-a3cb-e5170b1c7e0a" value="false" />
+      </map>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/24_INT10_mod.adx b/24_INT10_mod.adx
new file mode 100644
index 0000000..7b67c25
--- /dev/null
+++ b/24_INT10_mod.adx
@@ -0,0 +1,786 @@
+<ADXFORMAT version="1.01">
+  <!-- Written 06/12/2026 09:10:11 -->
+  <ADXHEADER>
+    <guid>2c5735e5-97cf-4284-b768-67c83cc3bac1</guid>
+    <flags>0x10001</flags>
+    <objectcount>55</objectcount>
+    <userversion>2</userversion>
+    <author>Gordon Bolton</author>
+    <desc>Credit to Robert Saar - modified to reference byte 9 for INT, and added AA 55 header per ESP32-ALDL code - https://git.i3omb.com/gronod/ESP32-ALDL</desc>
+    <baud>4800</baud>
+    <DEFAULTS datasizeinbits="8" sigdigits="2" outputtype="3" baud="0" signed="0" lsbfirst="0" float="0" />
+    <monitorcmd>SMART</monitorcmd>
+  </ADXHEADER>
+
+  <ADXMONITOR id="MONIMPORT" idhash="0xC5C183FF" title="Imported Mon">
+    <mainbkgcolor>0x00FFFFFF</mainbkgcolor>
+    <plotbkgcolor>0x00F0F0F0</plotbkgcolor>
+    <plotoutlinecolor>0x00000000</plotoutlinecolor>
+    <titlecolor>0x00000000</titlecolor>
+    <timeaxiscolor>0x00000000</timeaxiscolor>
+    <entrycount>0</entrycount>
+  </ADXMONITOR>
+
+  <ADXDASHBOARD id="DASHIMPORT" idhash="0x5D4D481F" title="Imported Dash">
+    <entrycount>6</entrycount>
+    <ADXDGENTRY gaugetype="1" left="0" top="0" right="33" bottom="50" />
+    <ADXDGENTRY gaugetype="1" left="33" top="0" right="66" bottom="50" />
+    <ADXDGENTRY gaugetype="1" left="66" top="0" right="99" bottom="50" />
+    <ADXDGENTRY gaugetype="1" left="0" top="50" right="33" bottom="100" />
+    <ADXDGENTRY gaugetype="1" left="33" top="50" right="66" bottom="100" />
+    <ADXDGENTRY gaugetype="1" left="66" top="50" right="99" bottom="100" />
+  </ADXDASHBOARD>
+
+  <ADXCLISTENPACKET id="SMART" idhash="0xE82E2B75" title="Data Transfer" flags="0x00000001">
+    <listentimeout>400</listentimeout>
+    <packetbodylength>25</packetbodylength>
+    <packetoffsetinbody>2</packetoffsetinbody>
+    <packetsize>27</packetsize>
+    <headerstring size="2">AA55</headerstring>
+  </ADXCLISTENPACKET>
+
+  <ADXLOOKUPTABLE id="52" idhash="0xDE689CB0" title="MAT C">
+    <desc>&lt;Comments&gt;</desc>
+    <inputtype>1</inputtype>
+    <outputtype>3</outputtype>
+    <lookupmode>0</lookupmode>
+    <entrycount>39</entrycount>
+    <tableentry input="1.000000" output="200.000000" />
+    <tableentry input="13.000000" output="150.000000" />
+    <tableentry input="14.000000" output="145.000000" />
+    <tableentry input="15.000000" output="140.000000" />
+    <tableentry input="17.000000" output="135.000000" />
+    <tableentry input="19.000000" output="130.000000" />
+    <tableentry input="22.000000" output="125.000000" />
+    <tableentry input="24.000000" output="120.000000" />
+    <tableentry input="27.000000" output="115.000000" />
+    <tableentry input="31.000000" output="110.000000" />
+    <tableentry input="35.000000" output="105.000000" />
+    <tableentry input="40.000000" output="100.000000" />
+    <tableentry input="45.000000" output="95.000000" />
+    <tableentry input="51.000000" output="90.000000" />
+    <tableentry input="57.000000" output="85.000000" />
+    <tableentry input="65.000000" output="80.000000" />
+    <tableentry input="73.000000" output="75.000000" />
+    <tableentry input="82.000000" output="70.000000" />
+    <tableentry input="93.000000" output="65.000000" />
+    <tableentry input="103.000000" output="60.000000" />
+    <tableentry input="115.000000" output="55.000000" />
+    <tableentry input="127.000000" output="50.000000" />
+    <tableentry input="140.000000" output="45.000000" />
+    <tableentry input="153.000000" output="40.000000" />
+    <tableentry input="166.000000" output="35.000000" />
+    <tableentry input="178.000000" output="30.000000" />
+    <tableentry input="190.000000" output="25.000000" />
+    <tableentry input="200.000000" output="20.000000" />
+    <tableentry input="210.000000" output="15.000000" />
+    <tableentry input="219.000000" output="10.000000" />
+    <tableentry input="226.000000" output="5.000000" />
+    <tableentry input="232.000000" output="0.000000" />
+    <tableentry input="238.000000" output="-5.000000" />
+    <tableentry input="242.000000" output="-10.000000" />
+    <tableentry input="246.000000" output="-15.000000" />
+    <tableentry input="248.000000" output="-20.000000" />
+    <tableentry input="251.000000" output="-25.000000" />
+    <tableentry input="252.000000" output="-30.000000" />
+    <tableentry input="256.000000" output="-40.000000" />
+  </ADXLOOKUPTABLE>
+
+  <ADXLOOKUPTABLE id="53" idhash="0xDE6883B0" title="MAT F">
+    <desc>&lt;Comments&gt;</desc>
+    <inputtype>1</inputtype>
+    <outputtype>3</outputtype>
+    <lookupmode>0</lookupmode>
+    <entrycount>39</entrycount>
+    <tableentry input="1.000000" output="392.000000" />
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+    <tableentry input="232.000000" output="32.000000" />
+    <tableentry input="238.000000" output="23.000000" />
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+    <tableentry input="251.000000" output="-13.000000" />
+    <tableentry input="252.000000" output="-22.000000" />
+    <tableentry input="256.000000" output="-40.000000" />
+  </ADXLOOKUPTABLE>
+
+  <ADXVALUE id="4" idhash="0x86F3533B" title="Vehicle Speed">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <units>MPH</units>
+    <packetoffset>0x05</packetoffset>
+    <range low="0.000000" high="255.000000" />
+    <alarms low="0.000000" high="255.000000" />
+    <digcount>2</digcount>
+    <outputtype>1</outputtype>
+    <MATH equation="X">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="7" idhash="0x86F35DBB" title="Engine Speed">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <units>RPM</units>
+    <packetoffset>0x07</packetoffset>
+    <range low="0.000000" high="6375.000000" />
+    <alarms low="0.000000" high="6375.000000" />
+    <digcount>2</digcount>
+    <outputtype>3</outputtype>
+    <MATH equation="X * 25.000000 + 0.000000">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="8" idhash="0x86F350FB" title="TPS">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <units>Volts</units>
+    <packetoffset>0x08</packetoffset>
+    <range low="0.000000" high="5.000000" />
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+    <MATH equation="X * 0.019608 + 0.000000">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="2" idhash="0x86F34E3B" title="Coolant Temp">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <units>C</units>
+    <packetoffset>0x04</packetoffset>
+    <range low="-40.000000" high="151.250000" />
+    <alarms low="-40.000000" high="151.250000" />
+    <digcount>2</digcount>
+    <outputtype>3</outputtype>
+    <MATH equation="X * 0.750000 + -40.000000">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="3" idhash="0x86F3513B" title="Coolant Temp">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <units>F</units>
+    <packetoffset>0x04</packetoffset>
+    <range low="-40.000000" high="304.250000" />
+    <alarms low="-40.000000" high="304.250000" />
+    <digcount>2</digcount>
+    <outputtype>3</outputtype>
+    <MATH equation="X * 1.350000 + -40.000000">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="49" idhash="0xDE6A7930" title="MAT">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
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+    <MATH equation="X" lookupidhash="0xDE689CB0">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="50" idhash="0xDE688850" title="MAT">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <units>F</units>
+    <packetoffset>0x16</packetoffset>
+    <range low="392.000000" high="-40.000000" />
+    <alarms low="392.000000" high="-40.000000" />
+    <digcount>2</digcount>
+    <outputtype>3</outputtype>
+    <MATH equation="X" lookupidhash="0xDE6883B0">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="5" idhash="0x86F3445B" title="MAP">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <units>Volts</units>
+    <packetoffset>0x06</packetoffset>
+    <range low="0.000000" high="5.000000" />
+    <alarms low="0.000000" high="5.000000" />
+    <digcount>2</digcount>
+    <outputtype>3</outputtype>
+    <MATH equation="X * 0.019608 + 0.000000">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="6" idhash="0x86F347FB" title="MAP">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <units>kPa</units>
+    <packetoffset>0x06</packetoffset>
+    <range low="10.350000" high="104.449997" />
+    <alarms low="10.350000" high="104.449997" />
+    <digcount>2</digcount>
+    <outputtype>3</outputtype>
+    <MATH equation="X * 0.369000 + 10.354000">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="45" idhash="0xDE6A7AD0" title="BLM">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <packetoffset>0x12</packetoffset>
+    <range low="0.000000" high="255.000000" />
+    <alarms low="0.000000" high="255.000000" />
+    <digcount>2</digcount>
+    <outputtype>1</outputtype>
+    <MATH equation="X">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="9" idhash="0x86F347BB" title="INT">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <packetoffset>0x09</packetoffset>
+    <range low="0.000000" high="255.000000" />
+    <alarms low="0.000000" high="255.000000" />
+    <digcount>2</digcount>
+    <outputtype>1</outputtype>
+    <MATH equation="X">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="10" idhash="0xDE6A9050" title="O2 Sensor">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <units>mV</units>
+    <packetoffset>0x0A</packetoffset>
+    <range low="0.000000" high="1132.199951" />
+    <alarms low="0.000000" high="1132.199951" />
+    <digcount>2</digcount>
+    <outputtype>3</outputtype>
+    <MATH equation="X * 4.440000 + 0.000000">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="46" idhash="0xDE6A7970" title="Rich/Lean Transitions">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <units>Crosses</units>
+    <packetoffset>0x13</packetoffset>
+    <range low="0.000000" high="255.000000" />
+    <alarms low="0.000000" high="255.000000" />
+    <digcount>2</digcount>
+    <outputtype>1</outputtype>
+    <MATH equation="X">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="51" idhash="0xDE688610" title="BPW">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <units>mS</units>
+    <packetoffset>0x17</packetoffset>
+    <sizeinbits>16</sizeinbits>
+    <range low="0.000000" high="1000.010010" />
+    <alarms low="0.000000" high="3.890000" />
+    <digcount>2</digcount>
+    <outputtype>3</outputtype>
+    <MATH equation="X * 0.015259 + 0.000000">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="48" idhash="0xDE6A6E70" title="EGR Duty Cycle">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <units>%</units>
+    <packetoffset>0x15</packetoffset>
+    <range low="0.000000" high="100.000000" />
+    <alarms low="0.000000" high="100.000000" />
+    <digcount>2</digcount>
+    <outputtype>3</outputtype>
+    <MATH equation="X * 0.392157 + 0.000000">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="47" idhash="0xDE6A6330" title="Spark Advance">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <units>*</units>
+    <packetoffset>0x14</packetoffset>
+    <range low="0.000000" high="89.650002" />
+    <alarms low="0.000000" high="89.650002" />
+    <digcount>2</digcount>
+    <outputtype>3</outputtype>
+    <MATH equation="X * 0.351563 + 0.000000">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="44" idhash="0xDE6A6DB0" title="Battery Voltage">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <units>Volts</units>
+    <packetoffset>0x11</packetoffset>
+    <range low="0.000000" high="25.500000" />
+    <alarms low="0.000000" high="25.500000" />
+    <digcount>2</digcount>
+    <outputtype>3</outputtype>
+    <MATH equation="X * 0.100000 + 0.000000">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXVALUE id="1" idhash="0x86F3549B" title="IAC Position">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <units>Steps</units>
+    <packetoffset>0x03</packetoffset>
+    <range low="0.000000" high="255.000000" />
+    <alarms low="0.000000" high="255.000000" />
+    <digcount>2</digcount>
+    <outputtype>1</outputtype>
+    <MATH equation="X">
+      <VAR varID="X" type="native" />
+    </MATH>
+  </ADXVALUE>
+
+  <ADXBITMASK id="19" idhash="0xDE6A8D30" title="12 Crank Sensor/System Check">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0B</packetoffset>
+    <operand>0x00000080</operand>
+    <bitop>AND</bitop>
+    <result>0x00000080</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="18" idhash="0xDE6A9A70" title="13 O2 Sensor">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0B</packetoffset>
+    <operand>0x00000040</operand>
+    <bitop>AND</bitop>
+    <result>0x00000040</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="17" idhash="0xDE6A9730" title="14 Coolant High">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0B</packetoffset>
+    <operand>0x00000020</operand>
+    <bitop>AND</bitop>
+    <result>0x00000020</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="16" idhash="0xDE6A8D70" title="15 Coolant Low">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0B</packetoffset>
+    <operand>0x00000010</operand>
+    <bitop>AND</bitop>
+    <result>0x00000010</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="15" idhash="0xDE6A8ED0" title="21 TPS High">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0B</packetoffset>
+    <operand>0x00000008</operand>
+    <bitop>AND</bitop>
+    <result>0x00000008</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="14" idhash="0xDE6A99B0" title="22 TPS Low">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0B</packetoffset>
+    <operand>0x00000004</operand>
+    <bitop>AND</bitop>
+    <result>0x00000004</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="13" idhash="0xDE6A9BB0" title="23 MAT Low">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0B</packetoffset>
+    <operand>0x00000002</operand>
+    <bitop>AND</bitop>
+    <result>0x00000002</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="12" idhash="0xDE6A84B0" title="24 VSS">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0B</packetoffset>
+    <operand>0x00000001</operand>
+    <bitop>AND</bitop>
+    <result>0x00000001</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="25" idhash="0xDE69DAD0" title="25 MAT High">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0C</packetoffset>
+    <operand>0x00000080</operand>
+    <bitop>AND</bitop>
+    <result>0x00000080</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="24" idhash="0xDE69CDB0" title="32 EGR">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0C</packetoffset>
+    <operand>0x00000020</operand>
+    <bitop>AND</bitop>
+    <result>0x00000020</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="23" idhash="0xDE69CFB0" title="33 MAP High">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0C</packetoffset>
+    <operand>0x00000010</operand>
+    <bitop>AND</bitop>
+    <result>0x00000010</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="22" idhash="0xDE69D0B0" title="34 MAP Low">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0C</packetoffset>
+    <operand>0x00000008</operand>
+    <bitop>AND</bitop>
+    <result>0x00000008</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="21" idhash="0xDE69CA10" title="35 IAC">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0C</packetoffset>
+    <operand>0x00000004</operand>
+    <bitop>AND</bitop>
+    <result>0x00000004</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="20" idhash="0xDE69C450" title="42 EST">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0C</packetoffset>
+    <operand>0x00000001</operand>
+    <bitop>AND</bitop>
+    <result>0x00000001</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="32" idhash="0xDE6A30B0" title="43 Knock Sensor">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0D</packetoffset>
+    <operand>0x00000080</operand>
+    <bitop>AND</bitop>
+    <result>0x00000080</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="31" idhash="0xDE6A2A10" title="44 O2 Lean">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0D</packetoffset>
+    <operand>0x00000040</operand>
+    <bitop>AND</bitop>
+    <result>0x00000040</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="30" idhash="0xDE6A2450" title="45 O2 Rich">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0D</packetoffset>
+    <operand>0x00000020</operand>
+    <bitop>AND</bitop>
+    <result>0x00000020</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="29" idhash="0xDE69D930" title="51 PROM">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0D</packetoffset>
+    <operand>0x00000010</operand>
+    <bitop>AND</bitop>
+    <result>0x00000010</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="28" idhash="0xDE69CE70" title="52 CAL-PACK">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0D</packetoffset>
+    <operand>0x00000008</operand>
+    <bitop>AND</bitop>
+    <result>0x00000008</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="27" idhash="0xDE69C330" title="53 Battery Voltage High">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0D</packetoffset>
+    <operand>0x00000004</operand>
+    <bitop>AND</bitop>
+    <result>0x00000004</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="26" idhash="0xDE69D970" title="55 ADU">
+    <flags>0x00000004</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ERROR</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0D</packetoffset>
+    <operand>0x00000001</operand>
+    <bitop>AND</bitop>
+    <result>0x00000001</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="34" idhash="0xDE6A2DB0" title="BLM Enable">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>YES</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0E</packetoffset>
+    <operand>0x00000002</operand>
+    <bitop>AND</bitop>
+    <result>0x00000002</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="35" idhash="0xDE6A3AD0" title="Quasi Pulse">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>YES</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0E</packetoffset>
+    <operand>0x00000008</operand>
+    <bitop>AND</bitop>
+    <result>0x00000008</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="36" idhash="0xDE6A3970" title="Async Pulse">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>YES</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0E</packetoffset>
+    <operand>0x00000010</operand>
+    <bitop>AND</bitop>
+    <result>0x00000010</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="37" idhash="0xDE6A2330" title="Rich/Lean">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>RICH</truestring>
+    <falsestring>LEAN</falsestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0E</packetoffset>
+    <operand>0x00000040</operand>
+    <bitop>AND</bitop>
+    <result>0x00000040</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="38" idhash="0xDE6A2E70" title="Loop Status">
+    <flags>0x00000008</flags>
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>CLOSED</truestring>
+    <falsestring>OPEN</falsestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0E</packetoffset>
+    <operand>0x00000080</operand>
+    <bitop>AND</bitop>
+    <result>0x00000080</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="39" idhash="0xDE6A3930" title="A/C">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <falsestring>ENABLED</falsestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0F</packetoffset>
+    <operand>0x00000020</operand>
+    <bitop>AND</bitop>
+    <result>0x00000020</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="40" idhash="0xDE6A6450" title="P/N Switch">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>PARK/NEUTRAL</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x0F</packetoffset>
+    <operand>0x00000080</operand>
+    <bitop>AND</bitop>
+    <result>0x00000080</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="41" idhash="0xDE6A6A10" title="A/C Clutch">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ENABLED</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x10</packetoffset>
+    <operand>0x00000001</operand>
+    <bitop>AND</bitop>
+    <result>0x00000001</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="42" idhash="0xDE6A70B0" title="TCC">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>LOCKED</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x10</packetoffset>
+    <operand>0x00000004</operand>
+    <bitop>AND</bitop>
+    <result>0x00000004</result>
+  </ADXBITMASK>
+
+  <ADXBITMASK id="43" idhash="0xDE6A6FB0" title="Power Steering Cramp">
+    <parentcmdidhash>0xD05BBA9A</parentcmdidhash>
+    <truestring>ACTIVE</truestring>
+    <ALARMONSET color="0x000000FF" />
+    <ALARMONNOTSET color="0x0000FF00" />
+    <packetoffset>0x10</packetoffset>
+    <operand>0x00000020</operand>
+    <bitop>AND</bitop>
+    <result>0x00000020</result>
+  </ADXBITMASK>
+
+  <ADXLISTVIEW id="DEFAULTVIEW" idhash="0x38ADC566" title="Default View">
+    <entrycount>49</entrycount>
+    <ADXLVENTRY entrytype="0" itemidhash="0x86F3533B" />
+    <ADXLVENTRY entrytype="0" itemidhash="0x86F35DBB" />
+    <ADXLVENTRY entrytype="0" itemidhash="0x86F350FB" />
+    <ADXLVENTRY entrytype="0" itemidhash="0x86F34E3B" />
+    <ADXLVENTRY entrytype="0" itemidhash="0x86F3513B" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A7930" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE688850" />
+    <ADXLVENTRY entrytype="0" itemidhash="0x86F3445B" />
+    <ADXLVENTRY entrytype="0" itemidhash="0x86F347FB" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A7AD0" />
+    <ADXLVENTRY entrytype="0" itemidhash="0x86F347BB" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A9050" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A7970" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE688610" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A6E70" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A6330" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A6DB0" />
+    <ADXLVENTRY entrytype="0" itemidhash="0x86F3549B" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A8D30" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A9A70" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A9730" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A8D70" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A8ED0" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A99B0" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A9BB0" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A84B0" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE69DAD0" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE69CDB0" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE69CFB0" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE69D0B0" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE69CA10" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE69C450" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A30B0" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A2A10" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A2450" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE69D930" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE69CE70" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE69C330" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE69D970" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A2DB0" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A3AD0" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A3970" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A2330" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A2E70" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A3930" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A6450" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A6A10" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A70B0" />
+    <ADXLVENTRY entrytype="0" itemidhash="0xDE6A6FB0" />
+  </ADXLISTVIEW>
+</ADXFORMAT>
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..a17e96a
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright Gordon Bolton (c) 2026
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
index 6e2034c..da20fa9 100644
--- a/README.md
+++ b/README.md
@@ -1,119 +1,76 @@
-# ESP32 ALDL Dashboard
+# ESP32 ALDL Dashboard Android Application
 
-An Android application built using Jetpack Compose to display real-time engine telemetry from a **1986 Pontiac Fiero 2.8L V6 (1227170 ECM)**. The app connects to a Bluetooth serial device named **ESP32-ALDL** and decodes a raw binary stream of 27-byte frames containing ECM data packets under the `$24` mask specifications.
+A modern, high-performance Android application designed to interface with GM OBD1 systems—specifically the **1986 Pontiac Fiero 1227170 ECM**—using a custom ESP32 Bluetooth SPP bridge. The app decodes the low-speed 160-baud ALDL (Assembly Line Diagnostic Link) datastream in real-time, displaying live telemetry, logging diagnostic parameters, and generating tuning heatmaps.
 
 ---
 
-## Technical Specifications
+## 🌟 Key Features
 
-### Data Stream Frame Structure
-The ESP32 reads the raw 160-baud unidirectional ALDL stream from the ECM and encapsulates it in a 27-byte packet transmitted over Bluetooth SPP.
-
-| Byte Index | Length | Value / Field | Description |
-| :--- | :--- | :--- | :--- |
-| **0 - 1** | 2 bytes | `AA 55` | Frame Sync Header (added by ESP32) |
-| **2 - 26** | 25 bytes | Raw Data Payload | 1227170 ECM data stream (0-indexed indices 0 to 24) |
+*   **Real-Time Instrumentation Dashboard:** 
+    *   Vibrant, animated Canvas-based components including a radial RPM gauge and a Throttle Position Sensor (TPS) bar graph.
+    *   Instantaneous readouts for Engine Speed (RPM), Vehicle Speed (MPH), Coolant Temperature, Manifold Air Temp (MAT), Manifold Absolute Pressure (MAP), TPS voltage, O2 Sensor voltage, and Battery voltage.
+    *   **Status Flags:** Instant visibility into critical operating states like Closed Loop Mode, Rich/Lean Mixture, Torque Converter Clutch (TCC) Lockup, and A/C Clutch requests.
+    *   **Derived Metrics:** Real-time calculated estimates of Engine Load and Fuel Flow Hints.
+*   **BLM & INT Fuel Trim Heatmap Grid (New):**
+    *   A real-time diagnostic table indexing fuel trim metrics across **14 RPM bands** (600 to 4800 RPM) and **17 MAP bands** (20 to 100 kPa).
+    *   Color-coded cell visualisations using dynamic RGB interpolation: Green for lean fuel trims ($\le 120$), Blue for stoichiometric neutral ($128$), and Red for rich fuel trims ($\ge 150$).
+*   **Multi-Parameter Line Charting (New):**
+    *   A dynamic telemetry visualizer toggling between a **Single Chart Mode** (large-scale view of any metric) and a **Multi Chart Mode** displaying up to 4 selected metrics in a 2x2 grid.
+    *   Supports charting for **12 distinct parameters**: RPM, Coolant Temp, MAP, TPS, O2 Sensor, Battery Voltage, Spark Advance, Base Pulse Width (BPW), MAT, BLM, Integrator, and Idle Air Control (IAC) Position.
+*   **Trouble Code Diagnostic Engine:**
+    *   Decodes active ECM trouble codes into human-readable alerts (e.g., *Code 14 - Coolant Temperature Sensor High*) dynamically displayed at the bottom of the dashboard screen.
+*   **Dual-Logging Framework:**
+    *   **Room Database Sessions:** Saves all active telemetry packets to a local SQLite database using Jetpack Room.
+    *   **TunerPro RT CSV Export:** Automatically compiles sessions into `.csv` log files fully compatible with TunerPro RT, exported to `Downloads/ALDLLogs` using Android MediaStore.
+    *   **Raw Binary Stream Logging (New):** Optional raw capture recording direct 27-byte diagnostic datastream packets (incorporating `AA 55` headers and 25-byte payloads) to `.bin` files for advanced playback and diagnostic troubleshooting.
+*   **Logged Files Manager (New):**
+    *   An in-app browser inside the Settings panel that scans `Downloads/ALDLLogs` for CSV and BIN logs, enabling users to view details, open logs with default viewers, or share files via the Android Sharesheet.
+*   **Persistent Preferences & Guardrails:**
+    *   DataStore-backed settings for Temperature Unit toggle (°C/°F), Auto-Logging toggles, Coolant alert thresholds, Low Battery alert thresholds, and Raw Binary Stream recording toggles.
 
 ---
 
-## Parameter Offsets & Decoding Formulas
+## 🛠️ Architecture & Technical Highlights
 
-The telemetry parameters are parsed from the `$24` / `$24A` ECM mask definitions (`24-INT10.ads`). In TunerPro's `.ads` file, the byte numbers are 1-indexed (e.g. `btByteNumber = 4` maps to raw payload byte index `3`).
-
-### 1. Primary Sensors & Measurements
-
-| Parameter | Payload Index | Raw Size | Formula / Conversion | Units |
-| :--- | :--- | :--- | :--- | :--- |
-| **IAC Position** | Index 3 (Byte 4) | 8-bit | $Value = Raw$ | Steps |
-| **Coolant Temp** | Index 4 (Byte 5) | 8-bit | $C = (Raw \times 0.75) - 40$<br>$F = (Raw \times 1.35) - 40$ | °C / °F |
-| **Vehicle Speed** | Index 5 (Byte 6) | 8-bit | $Value = Raw$ (Operation 3) | MPH |
-| **MAP** | Index 6 (Byte 7) | 8-bit | $Volts = Raw \times 0.019608$<br>$kPa = (Raw \times 0.369) + 10.354$ | Volts / kPa |
-| **Engine Speed** | Index 7 (Byte 8) | 8-bit | $RPM = Raw \times 25$ | RPM |
-| **TPS** | Index 8 (Byte 9) | 8-bit | $Volts = Raw \times 0.019608$ | Volts |
-| **Integrator (INT)** | Index 9 (Byte 10) | 8-bit | $Value = Raw$ | — |
-| **O2 Sensor** | Index 10 (Byte 11) | 8-bit | $mV = Raw \times 4.44$ | mV |
-| **Battery Voltage** | Index 17 (Byte 18) | 8-bit | $Volts = Raw \times 0.1$ | Volts |
-| **BLM** | Index 18 (Byte 19) | 8-bit | $Value = Raw$ | — |
-| **Rich/Lean Crosses** | Index 19 (Byte 20) | 8-bit | $Value = Raw$ | Crosses |
-| **Spark Advance** | Index 20 (Byte 21) | 8-bit | $Degrees = Raw \times 0.351563$ | Degrees |
-| **EGR Duty Cycle** | Index 21 (Byte 22) | 8-bit | $Percent = Raw \times 0.392157$ | % |
-| **Manifold Air Temp (MAT)** | Index 22 (Byte 23) | 8-bit | **Linear Table Interpolation** (see below) | °C / °F |
-| **Base Pulse Width (BPW)** | Index 23-24 (Byte 24-25) | 16-bit | $Raw = (HighByte \ll 8) \vert LowByte$<br>$ms = Raw \times 0.015259$ | Milliseconds (ms) |
+*   **Jetpack Compose & MVVM:** Developed with a clean Model-View-ViewModel architecture. State emission is managed via reactive `StateFlow` and `SharedFlow` streams to guarantee lag-free rendering.
+*   **Circular Buffering & Packet Validation (New):**
+    *   Ingests raw Bluetooth stream buffers using an `ArrayDeque<Byte>` circular buffer.
+    *   Employs a **27-byte lookahead validation algorithm** to search for authentic `AA 55` frame headers, preventing sync misalignment or telemetry corruption from noisy serial lines.
+*   **TunerPro ADS Translation:** Uses an advanced [ALDLParser](file:///home/gordon/esp32-aldl-android/app/src/test/java/com/example/esp32aldldashboard/ALDLParserTest.kt) mapping raw 25-byte payloads into physical metrics using exact scale conversions, offsets, and non-linear lookup interpolations (derived from the `24-INT10.ads` definition file).
+*   **Foreground Service Operations (New):**
+    *   Runs a persistent `BluetoothForegroundService` to keep the Bluetooth socket open and stream telemetry continuously in the background, even when the phone screen is locked or the app is minimized.
+*   **Firebase Integration:** Incorporates Firebase Crashlytics to monitor application stability and track runtime exceptions.
 
 ---
 
-### 2. MAT Linear Interpolation Tables
-The Manifold Air Temperature (MAT) is read from Index 22. It is mapped to degrees C or F using interpolation curves specified in tables 52 and 53:
+## 📱 Requirements
 
-*   **Celsius (`MAT C` - Table 52):**
-    *   `0` -> `200.0`, `12` -> `150.0`, `13` -> `145.0`, `14` -> `140.0`, `16` -> `135.0`, `18` -> `130.0`, `21` -> `125.0`, `23` -> `120.0`, `26` -> `115.0`, `30` -> `110.0`, `34` -> `105.0`, `39` -> `100.0`, `44` -> `95.0`, `50` -> `90.0`, `56` -> `85.0`, `64` -> `80.0`, `72` -> `75.0`, `81` -> `70.0`, `92` -> `65.0`, `102` -> `60.0`, `114` -> `55.0`, `126` -> `50.0`, `139` -> `45.0`, `152` -> `40.0`, `165` -> `35.0`, `177` -> `30.0`, `189` -> `25.0`, `199` -> `20.0`, `209` -> `15.0`, `218` -> `10.0`, `225` -> `5.0`, `231` -> `0.0`, `237` -> `-5.0`, `241` -> `-10.0`, `245` -> `-15.0`, `247` -> `-20.0`, `250` -> `-25.0`, `251` -> `-30.0`, `255` -> `-40.0`
-*   **Fahrenheit (`MAT F` - Table 53):**
-    *   `0` -> `392.0`, `12` -> `302.0`, `13` -> `293.0`, `14` -> `284.0`, `16` -> `275.0`, `18` -> `266.0`, `21` -> `257.0`, `23` -> `248.0`, `26` -> `239.0`, `30` -> `230.0`, `34` -> `221.0`, `39` -> `212.0`, `44` -> `203.0`, `50` -> `194.0`, `56` -> `185.0`, `64` -> `176.0`, `72` -> `167.0`, `81` -> `158.0`, `92` -> `149.0`, `102` -> `140.0`, `114` -> `131.0`, `126` -> `122.0`, `139` -> `113.0`, `152` -> `104.0`, `165` -> `95.0`, `177` -> `86.0`, `189` -> `77.0`, `199` -> `68.0`, `209` -> `59.0`, `218` -> `50.0`, `225` -> `41.0`, `231` -> `32.0`, `237` -> `23.0`, `241` -> `14.0`, `245` -> `5.0`, `247` -> `-4.0`, `250` -> `-13.0`, `251` -> `-22.0`, `255` -> `-40.0`
+*   **Android Device:** Android 8.0 (API Level 26) or higher.
+*   **Bluetooth Permissions:** Requires Nearby Devices (Android 12+) and Legacy Bluetooth Admin access.
+*   **ESP32 Transceiver:** Bridge hardware programmed to output 160-baud serial data from the ALDL pin and stream it over Classic Bluetooth SPP (named `ESP32-ALDL`).
 
 ---
 
-### 3. Stored Fault Trouble Codes
+## 🚀 Setup & Usage
 
-Malfunction Indicator Codes are mapped as bit flags across three specific status bytes:
-
-#### Codes Byte 1 (Payload Index 11 / Byte 12)
-*   **Bit 7:** Code 12 - Crank Sensor / System Check
-*   **Bit 6:** Code 13 - O2 Sensor
-*   **Bit 5:** Code 14 - Coolant High Temp
-*   **Bit 4:** Code 15 - Coolant Low Temp
-*   **Bit 3:** Code 21 - TPS Voltage High
-*   **Bit 2:** Code 22 - TPS Voltage Low
-*   **Bit 1:** Code 23 - MAT Voltage Low
-*   **Bit 0:** Code 24 - Vehicle Speed Sensor (VSS)
-
-#### Codes Byte 2 (Payload Index 12 / Byte 13)
-*   **Bit 7:** Code 25 - MAT Voltage High
-*   **Bit 5:** Code 32 - EGR System
-*   **Bit 4:** Code 33 - MAP Sensor High
-*   **Bit 3:** Code 34 - MAP Sensor Low
-*   **Bit 2:** Code 35 - IAC Position
-*   **Bit 0:** Code 42 - Electronic Spark Timing (EST)
-
-#### Codes Byte 3 (Payload Index 13 / Byte 14)
-*   **Bit 7:** Code 43 - Electronic Spark Control (Knock Sensor)
-*   **Bit 6:** Code 44 - O2 Sensor Lean Exhaust
-*   **Bit 5:** Code 45 - O2 Sensor Rich Exhaust
-*   **Bit 4:** Code 51 - PROM Error
-*   **Bit 3:** Code 52 - Cal-Pack Error
-*   **Bit 2:** Code 53 - System Battery Over-Voltage
-*   **Bit 0:** Code 55 - ADU Error
+1.  Pair the `ESP32-ALDL` Bluetooth module in your Android system settings.
+2.  Launch the application and grant all requested permissions.
+3.  Tap **Connect BT** on the main dashboard to establish connection and start telemetry.
+4.  Navigate between screens (Dashboard, Charts, BLM Table, Settings) using the bottom navigation bar.
+5.  Configure logging preferences or browse logged CSV/BIN files in the **Settings** menu.
 
 ---
 
-### 4. Engine Status & Bit Flags
+## 🧪 Testing & Verification
 
-#### Misc Byte 1 (Payload Index 14 / Byte 15)
-*   **Bit 1:** BLM Enabled (1 = Yes)
-*   **Bit 3:** Quasi Pulse Mode (1 = Yes)
-*   **Bit 4:** Async Pulse Mode (1 = Yes)
-*   **Bit 6:** Rich/Lean Status (1 = Rich, 0 = Lean)
-*   **Bit 7:** Loop Status (1 = Closed, 0 = Open)
+The parsing logic, scaling calculations, and boundary conditions are validated by a unit test suite located in [ALDLParserTest.kt](file:///home/gordon/esp32-aldl-android/app/src/test/java/com/example/esp32aldldashboard/ALDLParserTest.kt).
 
-#### Misc Byte 2 (Payload Index 15 / Byte 16)
-*   **Bit 5:** A/C Status (0 = Enabled, 1 = Disabled/Idle)
-*   **Bit 7:** Park/Neutral Switch (1 = Park/Neutral, 0 = In Gear)
+To run the unit tests, execute the following Gradle command in the root project directory:
+```bash
+./gradlew test
+```
 
-#### Misc Byte 3 (Payload Index 16 / Byte 17)
-*   **Bit 0:** A/C Clutch Command (1 = Enabled)
-*   **Bit 2:** Torque Converter Clutch (TCC) (1 = Locked)
-*   **Bit 5:** Power Steering Cramp Switch (1 = Active)
-
----
-
-## App Features & Architecture
-
-1.  **Bluetooth Thread Management:**
-    *   Queries for paired devices and connects directly to `"ESP32-ALDL"` over standard SPP RFCOMM sockets.
-    *   Robust frame synchronization: buffers incoming streams and aligns on the double-byte header `0xAA 0x55`.
-2.  **State Management:**
-    *   State flows from the Bluetooth thread through Kotlin `StateFlow` to Compose UI.
-3.  **Modern Dash Dashboard UI:**
-    *   Dynamic animations for RPM and TPS sweeps.
-    *   Metrics displayed in responsive tiles with custom indicator colors (e.g. engine loop states, fuel trims, battery health).
-    *   Live trouble code alert panel.
-    *   Diagnostic pane displaying real-time raw hex buffers for physical signal verification.
\ No newline at end of file
+### Coverage Areas
+*   **Sample Frame Decoding:** Parses a real-world telemetry payload and verifies the output of IAC position, coolant/manifold temperatures, MAP, TPS, battery voltage, BLM, integrator, spark advance, base pulse width, closed-loop flags, and active trouble codes.
+*   **Boundary Guards:** Ensures outlier protection for engine speeds, battery voltages, TPS, and coolant temperatures, rejecting out-of-range sensor values as invalid data packets.
+*   **Lookahead Stability:** Validates parser behavior against truncated or incomplete frame fragments.
\ No newline at end of file
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 0cf9aef..aab8ae8 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -2,6 +2,7 @@ plugins {
   alias(libs.plugins.android.application)
   alias(libs.plugins.compose.compiler)
   alias(libs.plugins.kotlin.serialization)
+  alias(libs.plugins.ksp)
 }
 
 android {
@@ -61,6 +62,8 @@ dependencies {
   implementation(libs.androidx.compose.ui)
   implementation(libs.androidx.compose.ui.tooling.preview)
   implementation(libs.androidx.compose.material3)
+  implementation(libs.androidx.compose.material.icons.core)
+  implementation(libs.androidx.compose.material.icons.extended)
   // Tooling
   debugImplementation(libs.androidx.compose.ui.tooling)
   // Instrumented tests
@@ -70,6 +73,7 @@ dependencies {
   // Local tests: jUnit, coroutines, Android runner
   testImplementation(libs.junit)
   testImplementation(libs.kotlinx.coroutines.test)
+  testImplementation(libs.mockk)
 
   // Instrumented tests: jUnit rules and runners
   androidTestImplementation(libs.androidx.test.core)
@@ -81,4 +85,12 @@ dependencies {
   implementation(libs.androidx.navigation3.ui)
   implementation(libs.androidx.navigation3.runtime)
   implementation(libs.androidx.lifecycle.viewmodel.navigation3)
+
+  // Room
+  implementation(libs.androidx.room.runtime)
+  implementation(libs.androidx.room.ktx)
+  ksp(libs.androidx.room.compiler)
+
+  // DataStore
+  implementation(libs.androidx.datastore.preferences)
 }
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 86887e4..3efe2fe 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -13,8 +13,14 @@
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" android:maxSdkVersion="30" />
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" android:maxSdkVersion="30" />
 
+    <!-- Foreground Service & Notifications -->
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_CONNECTED_DEVICE" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+
 
     <application
+        android:name=".AldlApplication"
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
@@ -22,6 +28,10 @@
         android:supportsRtl="true"
         android:windowSoftInputMode="adjustResize"
         android:theme="@style/Theme.ESP32ALDLDashboard">
+        <service
+            android:name=".bluetooth.BluetoothForegroundService"
+            android:foregroundServiceType="connectedDevice"
+            android:exported="false" />
         <activity
             android:name=".MainActivity"
             android:exported="true">
diff --git a/app/src/main/java/com/example/esp32aldldashboard/AldlApplication.kt b/app/src/main/java/com/example/esp32aldldashboard/AldlApplication.kt
new file mode 100644
index 0000000..e693533
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/AldlApplication.kt
@@ -0,0 +1,41 @@
+package com.example.esp32aldldashboard
+
+import android.app.Application
+import com.example.esp32aldldashboard.bluetooth.BluetoothService
+import com.example.esp32aldldashboard.repository.BLMTableRepository
+import com.example.esp32aldldashboard.repository.ChartPreferencesRepository
+import com.example.esp32aldldashboard.repository.SettingsRepository
+import com.example.esp32aldldashboard.repository.TelemetryRepository
+import com.example.esp32aldldashboard.logging.CsvLogger
+import com.example.esp32aldldashboard.logging.RawStreamLogger
+import com.example.esp32aldldashboard.data.database.TelemetryDatabase
+
+class AldlApplication : Application() {
+    lateinit var bluetoothService: BluetoothService
+    lateinit var telemetryRepository: TelemetryRepository
+    lateinit var settingsRepository: SettingsRepository
+
+    lateinit var csvLogger: CsvLogger
+    lateinit var rawStreamLogger: RawStreamLogger
+    lateinit var chartPreferencesRepository: ChartPreferencesRepository
+    lateinit var blmTableRepository: BLMTableRepository
+
+    override fun onCreate() {
+        super.onCreate()
+        val database = TelemetryDatabase.getDatabase(this)
+        settingsRepository = SettingsRepository(this)
+        chartPreferencesRepository = ChartPreferencesRepository(this)
+        blmTableRepository = BLMTableRepository()
+        csvLogger = CsvLogger(this)
+        rawStreamLogger = RawStreamLogger(this)
+        bluetoothService = BluetoothService(this, rawStreamLogger, settingsRepository)
+        telemetryRepository = TelemetryRepository(
+            this,
+            bluetoothService,
+            database.telemetryDao(),
+            csvLogger,
+            settingsRepository,
+            blmTableRepository
+        )
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/Navigation.kt b/app/src/main/java/com/example/esp32aldldashboard/Navigation.kt
index 757ef4b..61fce57 100644
--- a/app/src/main/java/com/example/esp32aldldashboard/Navigation.kt
+++ b/app/src/main/java/com/example/esp32aldldashboard/Navigation.kt
@@ -20,7 +20,7 @@ fun MainNavigation() {
     entryProvider =
       entryProvider {
         entry<Main> {
-          MainScreen(onItemClick = { navKey -> backStack.add(navKey) }, modifier = Modifier.safeDrawingPadding().padding(16.dp))
+          MainScreen(modifier = Modifier.safeDrawingPadding().padding(horizontal = 0.dp))
         }
       },
   )
diff --git a/app/src/main/java/com/example/esp32aldldashboard/bluetooth/BluetoothForegroundService.kt b/app/src/main/java/com/example/esp32aldldashboard/bluetooth/BluetoothForegroundService.kt
new file mode 100644
index 0000000..f1dabcd
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/bluetooth/BluetoothForegroundService.kt
@@ -0,0 +1,136 @@
+package com.example.esp32aldldashboard.bluetooth
+
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.app.Service
+import android.content.Intent
+import android.os.Build
+import android.os.IBinder
+import androidx.core.app.NotificationCompat
+import com.example.esp32aldldashboard.AldlApplication
+import com.example.esp32aldldashboard.MainActivity
+import com.example.esp32aldldashboard.R
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.launch
+
+class BluetoothForegroundService : Service() {
+
+    private val CHANNEL_ID = "ALDL_BT_CHANNEL"
+    private val NOTIFICATION_ID = 101
+
+    private val serviceScope = CoroutineScope(Dispatchers.Main + Job())
+    private lateinit var bluetoothService: BluetoothService
+
+    companion object {
+        const val ACTION_START = "ACTION_START"
+        const val ACTION_STOP = "ACTION_STOP"
+        const val ACTION_DISCONNECT = "ACTION_DISCONNECT"
+    }
+
+    override fun onCreate() {
+        super.onCreate()
+        val app = application as AldlApplication
+        bluetoothService = app.bluetoothService
+        createNotificationChannel()
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        when (intent?.action) {
+            ACTION_START -> {
+                startForeground(NOTIFICATION_ID, createNotification("Connected to ESP32-ALDL"))
+                observeTelemetry()
+            }
+            ACTION_DISCONNECT -> {
+                bluetoothService.disconnect()
+                stopForeground(STOP_FOREGROUND_REMOVE)
+                stopSelf()
+            }
+            ACTION_STOP -> {
+                bluetoothService.disconnect()
+                stopForeground(STOP_FOREGROUND_REMOVE)
+                stopSelf()
+            }
+        }
+        return START_NOT_STICKY
+    }
+
+    private fun observeTelemetry() {
+        serviceScope.launch {
+            bluetoothService.latestFrame.collectLatest { frame ->
+                if (frame != null) {
+                    updateNotification("RPM: ${frame.engineSpeedRpm} | Coolant: ${String.format("%.1f", frame.coolantTempC)}°C")
+                }
+            }
+        }
+        
+        serviceScope.launch {
+            bluetoothService.connectionState.collectLatest { state ->
+                when (state) {
+                    ConnectionState.DISCONNECTED, ConnectionState.ERROR -> {
+                        stopForeground(STOP_FOREGROUND_REMOVE)
+                        stopSelf()
+                    }
+                    else -> {}
+                }
+            }
+        }
+    }
+
+    private fun createNotification(contentText: String): Notification {
+        val intent = Intent(this, MainActivity::class.java)
+        val pendingIntent = PendingIntent.getActivity(
+            this, 0, intent, PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
+        )
+
+        val disconnectIntent = Intent(this, BluetoothForegroundService::class.java).apply {
+            action = ACTION_DISCONNECT
+        }
+        val disconnectPendingIntent = PendingIntent.getService(
+            this, 1, disconnectIntent, PendingIntent.FLAG_IMMUTABLE
+        )
+
+        return NotificationCompat.Builder(this, CHANNEL_ID)
+            .setContentTitle("ALDL Telemetry Active")
+            .setContentText(contentText)
+            .setSmallIcon(R.mipmap.ic_launcher) // Use app icon for now
+            .setContentIntent(pendingIntent)
+            .addAction(0, "Disconnect", disconnectPendingIntent)
+            .setOngoing(true)
+            .setPriority(NotificationCompat.PRIORITY_LOW)
+            .setOnlyAlertOnce(true)
+            .build()
+    }
+
+    private fun updateNotification(contentText: String) {
+        val manager = getSystemService(NotificationManager::class.java)
+        manager.notify(NOTIFICATION_ID, createNotification(contentText))
+    }
+
+    private fun createNotificationChannel() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            val serviceChannel = NotificationChannel(
+                CHANNEL_ID,
+                "Bluetooth Connection Service",
+                NotificationManager.IMPORTANCE_LOW
+            )
+            val manager = getSystemService(NotificationManager::class.java)
+            manager.createNotificationChannel(serviceChannel)
+        }
+    }
+
+    override fun onBind(intent: Intent?): IBinder? {
+        return null
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        serviceScope.launch { 
+            // cancel jobs if needed 
+        }
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/bluetooth/BluetoothService.kt b/app/src/main/java/com/example/esp32aldldashboard/bluetooth/BluetoothService.kt
index b47cd23..5fd1957 100644
--- a/app/src/main/java/com/example/esp32aldldashboard/bluetooth/BluetoothService.kt
+++ b/app/src/main/java/com/example/esp32aldldashboard/bluetooth/BluetoothService.kt
@@ -9,6 +9,9 @@ import android.content.Context
 import android.util.Log
 import com.example.esp32aldldashboard.parser.ALDLFrame
 import com.example.esp32aldldashboard.parser.ALDLParser
+import com.example.esp32aldldashboard.logging.RawStreamLogger
+import com.example.esp32aldldashboard.repository.SettingsRepository
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
@@ -23,7 +26,11 @@ enum class ConnectionState {
     ERROR
 }
 
-class BluetoothService(private val context: Context) {
+class BluetoothService(
+    private val context: Context,
+    private val rawStreamLogger: RawStreamLogger,
+    private val settingsRepository: SettingsRepository
+) {
 
     private val TAG = "ALDLBluetoothService"
     private val SPP_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB")
@@ -37,9 +44,73 @@ class BluetoothService(private val context: Context) {
     private val _rawHexLog = MutableStateFlow<List<String>>(emptyList())
     val rawHexLog: StateFlow<List<String>> = _rawHexLog
 
+    private val _framesReceived = MutableStateFlow(0)
+    val framesReceived: StateFlow<Int> = _framesReceived
+
+    private val _parseErrors = MutableStateFlow(0)
+    val parseErrors: StateFlow<Int> = _parseErrors
+
+    private val _currentFrameRate = MutableStateFlow(0)
+    val currentFrameRate: StateFlow<Int> = _currentFrameRate
+
     private val _errorMessage = MutableStateFlow("")
     val errorMessage: StateFlow<String> = _errorMessage
 
+    private data class HeaderResult(val found: Boolean, val index: Int = -1)
+
+    /**
+     * Finds a valid AA 55 header in the buffer using 27-byte lookahead validation.
+     * If another AA 55 is found within 27 bytes of a detected header, the first is treated
+     * as false (payload data) and search continues.
+     */
+    private fun findValidHeader(buffer: ArrayDeque<Byte>): HeaderResult {
+        if (buffer.size < 27) return HeaderResult(false)
+        
+        val bytes = buffer.toList()
+        var searchStart = 0
+        
+        while (searchStart < bytes.size - 1) {
+            // Look for AA 55 starting at searchStart
+            var headerIdx = -1
+            for (i in searchStart until bytes.size - 1) {
+                val prev = bytes[i].toInt() and 0xFF
+                val curr = bytes[i + 1].toInt() and 0xFF
+                if (prev == 0xAA && curr == 0x55) {
+                    headerIdx = i
+                    break
+                }
+            }
+            
+            if (headerIdx == -1) {
+                return HeaderResult(false) // No header found
+            }
+            
+            // Check if there's another AA 55 within 27 bytes (indicating false header)
+            val lookAheadEnd = minOf(headerIdx + 27, bytes.size - 1)
+            var foundFalseHeader = false
+            
+            for (i in headerIdx + 2 until lookAheadEnd) {
+                if (i + 1 >= bytes.size) break
+                val prev = bytes[i].toInt() and 0xFF
+                val curr = bytes[i + 1].toInt() and 0xFF
+                if (prev == 0xAA && curr == 0x55) {
+                    // Found another header within 27 bytes - first one is likely false
+                    foundFalseHeader = true
+                    searchStart = headerIdx + 1 // Continue searching from after first AA
+                    break
+                }
+            }
+            
+            if (!foundFalseHeader) {
+                // Valid header found
+                return HeaderResult(true, headerIdx)
+            }
+            // Otherwise continue loop to find next candidate
+        }
+        
+        return HeaderResult(false)
+    }
+
     private var connectionJob: Job? = null
     private var socket: BluetoothSocket? = null
     private var isConnected = false
@@ -68,6 +139,12 @@ class BluetoothService(private val context: Context) {
         _errorMessage.value = ""
 
         connectionJob = CoroutineScope(Dispatchers.Default).launch {
+            // Start raw recording if enabled
+            val shouldRecordRaw = settingsRepository.recordRawDataFlow.first()
+            if (shouldRecordRaw) {
+                rawStreamLogger.startRecording()
+            }
+
             var simStep = 0
             val basePayload = byteArrayOf(
                 0x20.toByte(), 0x00.toByte(), 0x2A.toByte(), 0x5F.toByte(), 0x59.toByte(),
@@ -157,14 +234,26 @@ class BluetoothService(private val context: Context) {
                 payload[24] = bpwLowRaw.toByte()
 
                 val parsed = ALDLParser.parseFrame(payload)
-                if (parsed != null) {
-                    _latestFrame.value = parsed
+                if (parsed is com.example.esp32aldldashboard.parser.ALDLParseResult.Success) {
+                    _latestFrame.value = parsed.frame
                     val hexString = payload.joinToString(" ") { String.format("%02X", it) }
                     addRawHexLog("AA 55 $hexString (SIMULATED)")
+                    
+                    // Log raw frame if recording is enabled
+                    if (rawStreamLogger.isRecording()) {
+                        val rawFrame = ByteArray(27)
+                        rawFrame[0] = 0xAA.toByte()
+                        rawFrame[1] = 0x55.toByte()
+                        payload.copyInto(rawFrame, 2, 0, 25)
+                        rawStreamLogger.logFrame(rawFrame)
+                    }
                 }
 
                 delay(1000)
             }
+            
+            // Stop raw recording when simulation ends
+            rawStreamLogger.stopRecording()
         }
     }
 
@@ -218,8 +307,17 @@ class BluetoothService(private val context: Context) {
                     _connectionState.value = ConnectionState.CONNECTED
                 }
 
+                // Start raw recording if enabled
+                val shouldRecordRaw = settingsRepository.recordRawDataFlow.first()
+                if (shouldRecordRaw) {
+                    rawStreamLogger.startRecording()
+                }
+
                 readDataStream(socket!!.inputStream)
 
+                // Stop raw recording when connection ends
+                rawStreamLogger.stopRecording()
+
             } catch (e: Exception) {
                 Log.e(TAG, "Connection failed: ${e.message}", e)
                 withContext(Dispatchers.Main) {
@@ -233,7 +331,9 @@ class BluetoothService(private val context: Context) {
 
     private suspend fun readDataStream(inputStream: InputStream) {
         val readBuffer = ByteArray(128)
-        val syncBuffer = ArrayList<Byte>()
+        val syncBuffer = ArrayDeque<Byte>(128)
+        var lastFrameTime = System.currentTimeMillis()
+        var framesInCurrentSecond = 0
 
         while (currentCoroutineContext().isActive && isConnected) {
             try {
@@ -245,55 +345,83 @@ class BluetoothService(private val context: Context) {
                 }
 
                 for (j in 0 until bytesRead) {
-                    syncBuffer.add(readBuffer[j])
+                    syncBuffer.addLast(readBuffer[j])
                 }
 
                 // Check for frame matches in buffer
                 while (syncBuffer.size >= 27) {
-                    var foundHeader = false
-                    for (idx in 0 until syncBuffer.size - 1) {
-                        if ((syncBuffer[idx].toInt() and 0xFF) == 0xAA && (syncBuffer[idx + 1].toInt() and 0xFF) == 0x55) {
-                            // Discard garbage preceding header
-                            if (idx > 0) {
-                                for (d in 0 until idx) {
-                                    syncBuffer.removeAt(0)
-                                }
+                    val headerResult = findValidHeader(syncBuffer)
+                    
+                    if (headerResult.found) {
+                        val headerIdx = headerResult.index
+                        
+                        // Discard garbage preceding header
+                        if (headerIdx > 0) {
+                            _parseErrors.value += 1
+                            for (i in 0 until headerIdx) {
+                                syncBuffer.removeFirst()
                             }
-                            foundHeader = true
-                            break
                         }
-                    }
 
-                    if (foundHeader) {
+                        // Validate we have enough data for full frame
                         if (syncBuffer.size >= 27) {
-                            val payload = ByteArray(25)
-                            for (p in 0 until 25) {
-                                payload[p] = syncBuffer[p + 2]
-                            }
+                            syncBuffer.removeFirst() // AA
+                            syncBuffer.removeFirst() // 55
 
-                            // Consume the 27 bytes from buffer
-                            for (r in 0 until 27) {
-                                syncBuffer.removeAt(0)
+                            val payload = ByteArray(25)
+                            val rawFrame = ByteArray(27) // Include header for raw logging
+                            rawFrame[0] = 0xAA.toByte()
+                            rawFrame[1] = 0x55.toByte()
+                            
+                            for (p in 0 until 25) {
+                                payload[p] = syncBuffer.removeFirst()
+                                rawFrame[p + 2] = payload[p]
                             }
 
                             val parsed = ALDLParser.parseFrame(payload)
-                            if (parsed != null) {
-                                withContext(Dispatchers.Main) {
-                                    _latestFrame.value = parsed
-                                    val hexString = payload.joinToString(" ") { String.format("%02X", it) }
-                                    addRawHexLog("AA 55 $hexString")
+                            when (parsed) {
+                                is com.example.esp32aldldashboard.parser.ALDLParseResult.Success -> {
+                                    _framesReceived.value += 1
+                                    framesInCurrentSecond++
+                                    
+                                    val now = System.currentTimeMillis()
+                                    if (now - lastFrameTime >= 1000) {
+                                        _currentFrameRate.value = framesInCurrentSecond
+                                        framesInCurrentSecond = 0
+                                        lastFrameTime = now
+                                    }
+
+                                    withContext(Dispatchers.Main) {
+                                        _latestFrame.value = parsed.frame
+                                        val hexString = payload.joinToString(" ") { String.format("%02X", it) }
+                                        addRawHexLog("AA 55 $hexString")
+                                    }
                                 }
+                                is com.example.esp32aldldashboard.parser.ALDLParseResult.InvalidData -> {
+                                    _parseErrors.value += 1
+                                    Log.w(TAG, "Invalid frame: ${parsed.reason}")
+                                }
+                                com.example.esp32aldldashboard.parser.ALDLParseResult.Incomplete -> {
+                                    // Handled by size check
+                                }
+                            }
+                            
+                            // Log raw frame if recording is enabled
+                            if (rawStreamLogger.isRecording()) {
+                                rawStreamLogger.logFrame(rawFrame)
                             }
                         } else {
                             // Header found, but waiting for full 27-byte frame
                             break
                         }
                     } else {
-                        // Header sequence not found, purge all but last byte if it is part of a potential header
+                        // No valid header found, purge all but potential header start
                         val lastByte = syncBuffer.last()
                         syncBuffer.clear()
                         if ((lastByte.toInt() and 0xFF) == 0xAA) {
-                            syncBuffer.add(lastByte)
+                            syncBuffer.addLast(lastByte)
+                        } else {
+                            _parseErrors.value += 1
                         }
                         break
                     }
diff --git a/app/src/main/java/com/example/esp32aldldashboard/data/database/SessionEntity.kt b/app/src/main/java/com/example/esp32aldldashboard/data/database/SessionEntity.kt
new file mode 100644
index 0000000..fe49715
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/data/database/SessionEntity.kt
@@ -0,0 +1,13 @@
+package com.example.esp32aldldashboard.data.database
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "sessions")
+data class SessionEntity(
+    @PrimaryKey(autoGenerate = true) val id: Long = 0,
+    val startTime: Long,
+    val endTime: Long? = null,
+    val name: String = "",
+    val isSimulation: Boolean = false
+)
diff --git a/app/src/main/java/com/example/esp32aldldashboard/data/database/TelemetryDao.kt b/app/src/main/java/com/example/esp32aldldashboard/data/database/TelemetryDao.kt
new file mode 100644
index 0000000..2cbc0c0
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/data/database/TelemetryDao.kt
@@ -0,0 +1,31 @@
+package com.example.esp32aldldashboard.data.database
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.Query
+import kotlinx.coroutines.flow.Flow
+
+import kotlin.jvm.JvmSuppressWildcards
+
+@Dao
+@JvmSuppressWildcards
+interface TelemetryDao {
+
+    @Insert
+    suspend fun insertSession(session: SessionEntity): Long
+
+    @Query("UPDATE sessions SET endTime = :endTime WHERE id = :sessionId")
+    suspend fun endSession(sessionId: Long, endTime: Long): Int
+
+    @Insert
+    suspend fun insertDataPoints(dataPoints: List<TelemetryDataPointEntity>): List<Long>
+
+    @Query("SELECT * FROM sessions ORDER BY startTime DESC")
+    fun getAllSessions(): Flow<List<SessionEntity>>
+
+    @Query("SELECT * FROM telemetry_data_points WHERE sessionId = :sessionId ORDER BY timestamp ASC")
+    fun getSessionData(sessionId: Long): Flow<List<TelemetryDataPointEntity>>
+
+    @Query("DELETE FROM sessions WHERE id = :sessionId")
+    suspend fun deleteSession(sessionId: Long): Int
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/data/database/TelemetryDataPointEntity.kt b/app/src/main/java/com/example/esp32aldldashboard/data/database/TelemetryDataPointEntity.kt
new file mode 100644
index 0000000..1ecc084
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/data/database/TelemetryDataPointEntity.kt
@@ -0,0 +1,47 @@
+package com.example.esp32aldldashboard.data.database
+
+import androidx.room.Entity
+import androidx.room.ForeignKey
+import androidx.room.Index
+import androidx.room.PrimaryKey
+
+@Entity(
+    tableName = "telemetry_data_points",
+    foreignKeys = [
+        ForeignKey(
+            entity = SessionEntity::class,
+            parentColumns = ["id"],
+            childColumns = ["sessionId"],
+            onDelete = ForeignKey.CASCADE
+        )
+    ],
+    indices = [
+        Index(value = ["sessionId", "timestamp"])
+    ]
+)
+data class TelemetryDataPointEntity(
+    @PrimaryKey(autoGenerate = true) val id: Long = 0,
+    val sessionId: Long,
+    val timestamp: Long,
+    val rawBytes: ByteArray
+) {
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as TelemetryDataPointEntity
+
+        if (id != other.id) return false
+        if (sessionId != other.sessionId) return false
+        if (timestamp != other.timestamp) return false
+        return rawBytes.contentEquals(other.rawBytes)
+    }
+
+    override fun hashCode(): Int {
+        var result = id.hashCode()
+        result = 31 * result + sessionId.hashCode()
+        result = 31 * result + timestamp.hashCode()
+        result = 31 * result + rawBytes.contentHashCode()
+        return result
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/data/database/TelemetryDatabase.kt b/app/src/main/java/com/example/esp32aldldashboard/data/database/TelemetryDatabase.kt
new file mode 100644
index 0000000..6555bc1
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/data/database/TelemetryDatabase.kt
@@ -0,0 +1,29 @@
+package com.example.esp32aldldashboard.data.database
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+
+@Database(entities = [SessionEntity::class, TelemetryDataPointEntity::class], version = 1, exportSchema = false)
+abstract class TelemetryDatabase : RoomDatabase() {
+
+    abstract fun telemetryDao(): TelemetryDao
+
+    companion object {
+        @Volatile
+        private var INSTANCE: TelemetryDatabase? = null
+
+        fun getDatabase(context: Context): TelemetryDatabase {
+            return INSTANCE ?: synchronized(this) {
+                val instance = Room.databaseBuilder(
+                    context.applicationContext,
+                    TelemetryDatabase::class.java,
+                    "telemetry_database"
+                ).build()
+                INSTANCE = instance
+                instance
+            }
+        }
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/logging/CsvLogger.kt b/app/src/main/java/com/example/esp32aldldashboard/logging/CsvLogger.kt
new file mode 100644
index 0000000..45f9023
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/logging/CsvLogger.kt
@@ -0,0 +1,100 @@
+package com.example.esp32aldldashboard.logging
+
+import android.content.ContentValues
+import android.content.Context
+import android.os.Build
+import android.os.Environment
+import android.provider.MediaStore
+import com.example.esp32aldldashboard.parser.ALDLFrame
+import java.io.OutputStream
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+
+class CsvLogger(private val context: Context) {
+
+    private var currentOutputStream: OutputStream? = null
+
+    fun startNewSession(isSimulation: Boolean): Boolean {
+        val timeStamp: String = SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US).format(Date())
+        val fileName = "ALDL_Log_${if(isSimulation) "SIM_" else ""}$timeStamp.csv"
+
+        try {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                val resolver = context.contentResolver
+                val contentValues = ContentValues().apply {
+                    put(MediaStore.MediaColumns.DISPLAY_NAME, fileName)
+                    put(MediaStore.MediaColumns.MIME_TYPE, "text/csv")
+                    put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_DOWNLOADS + "/ALDLLogs")
+                }
+
+                val uri = resolver.insert(MediaStore.Downloads.EXTERNAL_CONTENT_URI, contentValues)
+                if (uri != null) {
+                    currentOutputStream = resolver.openOutputStream(uri)
+                }
+            } else {
+                // For older Android versions, we'd need WRITE_EXTERNAL_STORAGE and write to Environment.getExternalStoragePublicDirectory.
+                // We'll skip legacy support for this specific snippet to keep it concise, assuming target is modern Android.
+                return false 
+            }
+
+            // Write CSV Header
+            val header = "Timestamp,Raw_Hex,RPM,Coolant_C,Coolant_F,MAP_kPa,MAP_Volts,TPS_Volts,O2_mV,Battery_V,Spark_Adv,IAC,BPW_ms,Speed_MPH,MAT_C,MAT_F,BLM,INT,EGR_Duty,Rich_Crosses,Closed_Loop,Rich\n"
+            currentOutputStream?.write(header.toByteArray())
+            return true
+        } catch (e: Exception) {
+            e.printStackTrace()
+            return false
+        }
+    }
+
+    fun logFrame(frame: ALDLFrame) {
+        val out = currentOutputStream ?: return
+        
+        val hexString = frame.rawBytes.joinToString(" ") { String.format("%02X", it) }
+        val dateString = SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS", Locale.US).format(Date(frame.timestamp))
+
+        val row = String.format(
+            Locale.US,
+            "%s,%s,%d,%.1f,%.1f,%.1f,%.3f,%.3f,%.1f,%.1f,%.1f,%d,%.2f,%d,%.1f,%.1f,%d,%d,%.1f,%d,%b,%b\n",
+            dateString,
+            hexString,
+            frame.engineSpeedRpm,
+            frame.coolantTempC,
+            frame.coolantTempF,
+            frame.mapKpa,
+            frame.mapVolts,
+            frame.tpsVolts,
+            frame.o2SensorMv,
+            frame.batteryVolts,
+            frame.sparkAdvance,
+            frame.iacPosition,
+            frame.bpwMs,
+            frame.vehicleSpeedMPH,
+            frame.matC,
+            frame.matF,
+            frame.blm,
+            frame.integrator,
+            frame.egrDutyCycle,
+            frame.richLeanCrosses,
+            frame.isClosedLoop,
+            frame.isRich
+        )
+
+        try {
+            out.write(row.toByteArray())
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+    }
+
+    fun endSession() {
+        try {
+            currentOutputStream?.close()
+        } catch (e: Exception) {
+            e.printStackTrace()
+        } finally {
+            currentOutputStream = null
+        }
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/logging/RawStreamLogger.kt b/app/src/main/java/com/example/esp32aldldashboard/logging/RawStreamLogger.kt
new file mode 100644
index 0000000..41a06d0
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/logging/RawStreamLogger.kt
@@ -0,0 +1,98 @@
+package com.example.esp32aldldashboard.logging
+
+import android.content.ContentValues
+import android.content.Context
+import android.net.Uri
+import android.os.Build
+import android.os.Environment
+import android.provider.MediaStore
+import java.io.OutputStream
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+
+/**
+ * Logs raw binary ALDL data streams for debugging purposes.
+ * Records full 27-byte frames (AA 55 header + 25-byte payload) to Downloads/ALDLLogs/
+ */
+class RawStreamLogger(private val context: Context) {
+
+    private var currentOutputStream: OutputStream? = null
+    private var currentUri: Uri? = null
+    private var isRecording = false
+
+    /**
+     * Starts a new raw recording session.
+     * @return true if recording started successfully, false otherwise
+     */
+    fun startRecording(): Boolean {
+        if (isRecording) return true
+
+        val timeStamp: String = SimpleDateFormat("yyyy-MM-dd_HH-mm-ss", Locale.US).format(Date())
+        val fileName = "raw_$timeStamp.bin"
+
+        return try {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                val resolver = context.contentResolver
+                val contentValues = ContentValues().apply {
+                    put(MediaStore.MediaColumns.DISPLAY_NAME, fileName)
+                    put(MediaStore.MediaColumns.MIME_TYPE, "application/octet-stream")
+                    put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_DOWNLOADS + "/ALDLLogs")
+                }
+
+                val uri = resolver.insert(MediaStore.Downloads.EXTERNAL_CONTENT_URI, contentValues)
+                if (uri != null) {
+                    currentUri = uri
+                    currentOutputStream = resolver.openOutputStream(uri)
+                    isRecording = true
+                    true
+                } else {
+                    false
+                }
+            } else {
+                // Legacy support not implemented for this debug feature
+                false
+            }
+        } catch (e: Exception) {
+            e.printStackTrace()
+            false
+        }
+    }
+
+    /**
+     * Logs a single 27-byte frame (including AA 55 header).
+     * @param frame The complete 27-byte frame to log
+     */
+    fun logFrame(frame: ByteArray) {
+        if (!isRecording || frame.size != 27) return
+
+        try {
+            currentOutputStream?.write(frame)
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+    }
+
+    /**
+     * Stops the current recording session and closes the file.
+     */
+    fun stopRecording() {
+        if (!isRecording) return
+
+        try {
+            currentOutputStream?.flush()
+            currentOutputStream?.close()
+        } catch (e: Exception) {
+            e.printStackTrace()
+        } finally {
+            currentOutputStream = null
+            currentUri = null
+            isRecording = false
+        }
+    }
+
+    /**
+     * Returns whether a recording session is currently active.
+     */
+    fun isRecording(): Boolean = isRecording
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/parser/ALDLParser.kt b/app/src/main/java/com/example/esp32aldldashboard/parser/ALDLParser.kt
index 5cbe560..b472906 100644
--- a/app/src/main/java/com/example/esp32aldldashboard/parser/ALDLParser.kt
+++ b/app/src/main/java/com/example/esp32aldldashboard/parser/ALDLParser.kt
@@ -45,93 +45,78 @@ data class ALDLFrame(
     }
 }
 
+sealed class ALDLParseResult {
+    data class Success(val frame: ALDLFrame) : ALDLParseResult()
+    data class InvalidData(val reason: String) : ALDLParseResult()
+    object Incomplete : ALDLParseResult()
+}
+
+object ALDLConstants {
+    const val PAYLOAD_SIZE = 25
+    
+    // Scale Factors
+    const val COOLANT_SCALE_C = 0.75f
+    const val COOLANT_OFFSET_C = -40.0f
+    const val COOLANT_SCALE_F = 1.35f
+    const val COOLANT_OFFSET_F = -40.0f
+    
+    const val MAP_VOLTS_SCALE = 0.019608f
+    const val MAP_KPA_SCALE = 0.369f
+    const val MAP_KPA_OFFSET = 10.354f
+    
+    const val RPM_SCALE = 25
+    const val TPS_VOLTS_SCALE = 0.019608f
+    const val O2_MV_SCALE = 4.44f
+    
+    const val BATTERY_VOLTS_SCALE = 0.1f
+    const val SPARK_ADVANCE_SCALE = 0.351563f
+    const val EGR_DUTY_CYCLE_SCALE = 0.392157f
+    const val BPW_MS_SCALE = 0.015259f
+
+    // Plausibility Limits
+    const val MAX_RPM = 8000
+    const val MIN_TEMP_C = -45.0f
+    const val MAX_TEMP_C = 220.0f
+    const val MIN_BATTERY_V = 5.0f
+    const val MAX_BATTERY_V = 20.0f
+    const val MAX_TPS_V = 5.1f
+
+    // Bitmasks
+    const val BIT_0 = 0x01
+    const val BIT_1 = 0x02
+    const val BIT_2 = 0x04
+    const val BIT_3 = 0x08
+    const val BIT_4 = 0x10
+    const val BIT_5 = 0x20
+    const val BIT_6 = 0x40
+    const val BIT_7 = 0x80
+
+    // MAT C interpolation table
+    val MAT_TABLE_C = listOf(
+        0 to 200.0f, 12 to 150.0f, 13 to 145.0f, 14 to 140.0f, 16 to 135.0f,
+        18 to 130.0f, 21 to 125.0f, 23 to 120.0f, 26 to 115.0f, 30 to 110.0f,
+        34 to 105.0f, 39 to 100.0f, 44 to 95.0f, 50 to 90.0f, 56 to 85.0f,
+        64 to 80.0f, 72 to 75.0f, 81 to 70.0f, 92 to 65.0f, 102 to 60.0f,
+        114 to 55.0f, 126 to 50.0f, 139 to 45.0f, 152 to 40.0f, 165 to 35.0f,
+        177 to 30.0f, 189 to 25.0f, 199 to 20.0f, 209 to 15.0f, 218 to 10.0f,
+        225 to 5.0f, 231 to 0.0f, 237 to -5.0f, 241 to -10.0f, 245 to -15.0f,
+        247 to -20.0f, 250 to -25.0f, 251 to -30.0f, 255 to -40.0f
+    )
+
+    // MAT F interpolation table
+    val MAT_TABLE_F = listOf(
+        0 to 392.0f, 12 to 302.0f, 13 to 293.0f, 14 to 284.0f, 16 to 275.0f,
+        18 to 266.0f, 21 to 257.0f, 23 to 248.0f, 26 to 239.0f, 30 to 230.0f,
+        34 to 221.0f, 39 to 212.0f, 44 to 203.0f, 50 to 194.0f, 56 to 185.0f,
+        64 to 176.0f, 72 to 167.0f, 81 to 158.0f, 92 to 149.0f, 102 to 140.0f,
+        114 to 131.0f, 126 to 122.0f, 139 to 113.0f, 152 to 104.0f, 165 to 95.0f,
+        177 to 86.0f, 189 to 77.0f, 199 to 68.0f, 209 to 59.0f, 218 to 50.0f,
+        225 to 41.0f, 231 to 32.0f, 237 to 23.0f, 241 to 14.0f, 245 to 5.0f,
+        247 to -4.0f, 250 to -13.0f, 251 to -22.0f, 255 to -40.0f
+    )
+}
+
 object ALDLParser {
-    // MAT C interpolation table: key is raw value, value is Temp in C
-    private val matTableC = listOf(
-        0 to 200.0f,
-        12 to 150.0f,
-        13 to 145.0f,
-        14 to 140.0f,
-        16 to 135.0f,
-        18 to 130.0f,
-        21 to 125.0f,
-        23 to 120.0f,
-        26 to 115.0f,
-        30 to 110.0f,
-        34 to 105.0f,
-        39 to 100.0f,
-        44 to 95.0f,
-        50 to 90.0f,
-        56 to 85.0f,
-        64 to 80.0f,
-        72 to 75.0f,
-        81 to 70.0f,
-        92 to 65.0f,
-        102 to 60.0f,
-        114 to 55.0f,
-        126 to 50.0f,
-        139 to 45.0f,
-        152 to 40.0f,
-        165 to 35.0f,
-        177 to 30.0f,
-        189 to 25.0f,
-        199 to 20.0f,
-        209 to 15.0f,
-        218 to 10.0f,
-        225 to 5.0f,
-        231 to 0.0f,
-        237 to -5.0f,
-        241 to -10.0f,
-        245 to -15.0f,
-        247 to -20.0f,
-        250 to -25.0f,
-        251 to -30.0f,
-        255 to -40.0f
-    )
-
-    // MAT F interpolation table: key is raw value, value is Temp in F
-    private val matTableF = listOf(
-        0 to 392.0f,
-        12 to 302.0f,
-        13 to 293.0f,
-        14 to 284.0f,
-        16 to 275.0f,
-        18 to 266.0f,
-        21 to 257.0f,
-        23 to 248.0f,
-        26 to 239.0f,
-        30 to 230.0f,
-        34 to 221.0f,
-        39 to 212.0f,
-        44 to 203.0f,
-        50 to 194.0f,
-        56 to 185.0f,
-        64 to 176.0f,
-        72 to 167.0f,
-        81 to 158.0f,
-        92 to 149.0f,
-        102 to 140.0f,
-        114 to 131.0f,
-        126 to 122.0f,
-        139 to 113.0f,
-        152 to 104.0f,
-        165 to 95.0f,
-        177 to 86.0f,
-        189 to 77.0f,
-        199 to 68.0f,
-        209 to 59.0f,
-        218 to 50.0f,
-        225 to 41.0f,
-        231 to 32.0f,
-        237 to 23.0f,
-        241 to 14.0f,
-        245 to 5.0f,
-        247 to -4.0f,
-        250 to -13.0f,
-        251 to -22.0f,
-        255 to -40.0f
-    )
-
     private fun interpolate(raw: Int, table: List<Pair<Int, Float>>): Float {
         if (raw <= table.first().first) return table.first().second
         if (raw >= table.last().first) return table.last().second
@@ -149,91 +134,100 @@ object ALDLParser {
     }
 
     /**
-     * Parses a 25-byte raw data payload.
+     * Parses a 25-byte raw data payload, validating bounds and checking for errors.
      */
-    fun parseFrame(data: ByteArray): ALDLFrame? {
-        if (data.size != 25) return null
+    fun parseFrame(data: ByteArray): ALDLParseResult {
+        if (data.size != ALDLConstants.PAYLOAD_SIZE) {
+            return ALDLParseResult.Incomplete
+        }
 
-        val u = IntArray(25) { data[it].toInt() and 0xFF }
+        val u = IntArray(ALDLConstants.PAYLOAD_SIZE) { data[it].toInt() and 0xFF }
 
-        // Mappings based on 1-indexed btByteNumber in 24-INT10.ads (index = byteNumber - 1)
-        val iacPosition = u[3] // Byte 4
-        val coolantTempC = u[4] * 0.75f - 40.0f // Byte 5
-        val coolantTempF = u[4] * 1.35f - 40.0f // Byte 5
-        val vehicleSpeedMPH = u[5] // Byte 6
-        val mapVolts = u[6] * 0.019608f // Byte 7
-        val mapKpa = u[6] * 0.369f + 10.354f // Byte 7
-        val engineSpeedRpm = u[7] * 25 // Byte 8
-        val tpsVolts = u[8] * 0.019608f // Byte 9
-        val integrator = u[9] // Byte 10
-        val o2SensorMv = u[10] * 4.44f // Byte 11
+        val engineSpeedRpm = u[7] * ALDLConstants.RPM_SCALE
+        if (engineSpeedRpm > ALDLConstants.MAX_RPM) {
+            return ALDLParseResult.InvalidData("RPM ($engineSpeedRpm) exceeds plausibility limit (${ALDLConstants.MAX_RPM})")
+        }
 
-        val codesByte1 = u[11] // Byte 12
-        val codesByte2 = u[12] // Byte 13
-        val codesByte3 = u[13] // Byte 14
-        val miscByte1 = u[14] // Byte 15
-        val miscByte2 = u[15] // Byte 16
-        val miscByte3 = u[16] // Byte 17
+        val coolantTempC = u[4] * ALDLConstants.COOLANT_SCALE_C + ALDLConstants.COOLANT_OFFSET_C
+        val coolantTempF = u[4] * ALDLConstants.COOLANT_SCALE_F + ALDLConstants.COOLANT_OFFSET_F
+        if (coolantTempC < ALDLConstants.MIN_TEMP_C || coolantTempC > ALDLConstants.MAX_TEMP_C) {
+            return ALDLParseResult.InvalidData("Coolant Temp ($coolantTempC C) outside bounds")
+        }
 
-        val batteryVolts = u[17] * 0.1f // Byte 18
-        val blm = u[18] // Byte 19
-        val richLeanCrosses = u[19] // Byte 20
-        val sparkAdvance = u[20] * 0.351563f // Byte 21
-        val egrDutyCycle = u[21] * 0.392157f // Byte 22
+        val batteryVolts = u[17] * ALDLConstants.BATTERY_VOLTS_SCALE
+        if (batteryVolts < ALDLConstants.MIN_BATTERY_V || batteryVolts > ALDLConstants.MAX_BATTERY_V) {
+            return ALDLParseResult.InvalidData("Battery Voltage ($batteryVolts V) outside bounds")
+        }
+
+        val tpsVolts = u[8] * ALDLConstants.TPS_VOLTS_SCALE
+        if (tpsVolts > ALDLConstants.MAX_TPS_V) {
+            return ALDLParseResult.InvalidData("TPS Voltage ($tpsVolts V) outside bounds")
+        }
+
+        val iacPosition = u[3]
+        val vehicleSpeedMPH = u[5]
+        val mapVolts = u[6] * ALDLConstants.MAP_VOLTS_SCALE
+        val mapKpa = u[6] * ALDLConstants.MAP_KPA_SCALE + ALDLConstants.MAP_KPA_OFFSET
+        val integrator = u[9]
+        val o2SensorMv = u[10] * ALDLConstants.O2_MV_SCALE
+
+        val codesByte1 = u[11]
+        val codesByte2 = u[12]
+        val codesByte3 = u[13]
+        val miscByte1 = u[14]
+        val miscByte2 = u[15]
+        val miscByte3 = u[16]
+
+        val blm = u[18]
+        val richLeanCrosses = u[19]
+        val sparkAdvance = u[20] * ALDLConstants.SPARK_ADVANCE_SCALE
+        val egrDutyCycle = u[21] * ALDLConstants.EGR_DUTY_CYCLE_SCALE
         
-        // MAT (Air Temp) Interpolation
-        val matC = interpolate(u[22], matTableC) // Byte 23
-        val matF = interpolate(u[22], matTableF) // Byte 23
+        val matC = interpolate(u[22], ALDLConstants.MAT_TABLE_C)
+        val matF = interpolate(u[22], ALDLConstants.MAT_TABLE_F)
 
-        // BPW (Base Pulse Width) 16-bit
-        val rawBpw = (u[23] shl 8) or u[24] // Byte 24 (High), Byte 25 (Low)
-        val bpwMs = rawBpw * 0.015259f
+        val rawBpw = (u[23] shl 8) or u[24]
+        val bpwMs = rawBpw * ALDLConstants.BPW_MS_SCALE
 
-        // Status Flags Decoding
-        // Misc Byte 1 (Byte 15)
-        val blmEnable = (miscByte1 and 0x02) != 0     // bit 1
-        val quasiPulse = (miscByte1 and 0x08) != 0    // bit 3
-        val asyncPulse = (miscByte1 and 0x10) != 0    // bit 4
-        val isRich = (miscByte1 and 0x40) != 0        // bit 6 (1=RICH, 0=LEAN)
-        val isClosedLoop = (miscByte1 and 0x80) != 0  // bit 7 (1=CLOSED, 0=OPEN)
+        val blmEnable = (miscByte1 and ALDLConstants.BIT_1) != 0
+        val quasiPulse = (miscByte1 and ALDLConstants.BIT_3) != 0
+        val asyncPulse = (miscByte1 and ALDLConstants.BIT_4) != 0
+        val isRich = (miscByte1 and ALDLConstants.BIT_6) != 0
+        val isClosedLoop = (miscByte1 and ALDLConstants.BIT_7) != 0
 
-        // Misc Byte 2 (Byte 16)
-        val isAcEnabled = (miscByte2 and 0x20) == 0   // bit 5 (0=ENABLED, 1=DISABLED/IDLE)
-        val isParkNeutral = (miscByte2 and 0x80) != 0 // bit 7 (1=PARK/NEUTRAL, 0=IN GEAR)
+        val isAcEnabled = (miscByte2 and ALDLConstants.BIT_5) == 0
+        val isParkNeutral = (miscByte2 and ALDLConstants.BIT_7) != 0
 
-        // Misc Byte 3 (Byte 17)
-        val isAcClutchEnabled = (miscByte3 and 0x01) != 0 // bit 0 (1=ENABLED)
-        val isTccLocked = (miscByte3 and 0x04) != 0       // bit 2 (1=LOCKED)
-        val isPowerSteeringCrampActive = (miscByte3 and 0x20) != 0 // bit 5 (1=ACTIVE)
+        val isAcClutchEnabled = (miscByte3 and ALDLConstants.BIT_0) != 0
+        val isTccLocked = (miscByte3 and ALDLConstants.BIT_2) != 0
+        val isPowerSteeringCrampActive = (miscByte3 and ALDLConstants.BIT_5) != 0
 
-        // Active Fault Codes list based on code bits
         val activeCodes = mutableListOf<Int>()
-        // Byte 12
-        if ((codesByte1 and 0x80) != 0) activeCodes.add(12) // bit 7
-        if ((codesByte1 and 0x40) != 0) activeCodes.add(13) // bit 6
-        if ((codesByte1 and 0x20) != 0) activeCodes.add(14) // bit 5
-        if ((codesByte1 and 0x10) != 0) activeCodes.add(15) // bit 4
-        if ((codesByte1 and 0x08) != 0) activeCodes.add(21) // bit 3
-        if ((codesByte1 and 0x04) != 0) activeCodes.add(22) // bit 2
-        if ((codesByte1 and 0x02) != 0) activeCodes.add(23) // bit 1
-        if ((codesByte1 and 0x01) != 0) activeCodes.add(24) // bit 0
-        // Byte 13
-        if ((codesByte2 and 0x80) != 0) activeCodes.add(25) // bit 7
-        if ((codesByte2 and 0x20) != 0) activeCodes.add(32) // bit 5
-        if ((codesByte2 and 0x10) != 0) activeCodes.add(33) // bit 4
-        if ((codesByte2 and 0x08) != 0) activeCodes.add(34) // bit 3
-        if ((codesByte2 and 0x04) != 0) activeCodes.add(35) // bit 2
-        if ((codesByte2 and 0x01) != 0) activeCodes.add(42) // bit 0
-        // Byte 14
-        if ((codesByte3 and 0x80) != 0) activeCodes.add(43) // bit 7
-        if ((codesByte3 and 0x40) != 0) activeCodes.add(44) // bit 6
-        if ((codesByte3 and 0x20) != 0) activeCodes.add(45) // bit 5
-        if ((codesByte3 and 0x10) != 0) activeCodes.add(51) // bit 4
-        if ((codesByte3 and 0x08) != 0) activeCodes.add(52) // bit 3
-        if ((codesByte3 and 0x04) != 0) activeCodes.add(53) // bit 2
-        if ((codesByte3 and 0x01) != 0) activeCodes.add(55) // bit 0
+        if ((codesByte1 and ALDLConstants.BIT_7) != 0) activeCodes.add(12)
+        if ((codesByte1 and ALDLConstants.BIT_6) != 0) activeCodes.add(13)
+        if ((codesByte1 and ALDLConstants.BIT_5) != 0) activeCodes.add(14)
+        if ((codesByte1 and ALDLConstants.BIT_4) != 0) activeCodes.add(15)
+        if ((codesByte1 and ALDLConstants.BIT_3) != 0) activeCodes.add(21)
+        if ((codesByte1 and ALDLConstants.BIT_2) != 0) activeCodes.add(22)
+        if ((codesByte1 and ALDLConstants.BIT_1) != 0) activeCodes.add(23)
+        if ((codesByte1 and ALDLConstants.BIT_0) != 0) activeCodes.add(24)
 
-        return ALDLFrame(
+        if ((codesByte2 and ALDLConstants.BIT_7) != 0) activeCodes.add(25)
+        if ((codesByte2 and ALDLConstants.BIT_5) != 0) activeCodes.add(32)
+        if ((codesByte2 and ALDLConstants.BIT_4) != 0) activeCodes.add(33)
+        if ((codesByte2 and ALDLConstants.BIT_3) != 0) activeCodes.add(34)
+        if ((codesByte2 and ALDLConstants.BIT_2) != 0) activeCodes.add(35)
+        if ((codesByte2 and ALDLConstants.BIT_0) != 0) activeCodes.add(42)
+
+        if ((codesByte3 and ALDLConstants.BIT_7) != 0) activeCodes.add(43)
+        if ((codesByte3 and ALDLConstants.BIT_6) != 0) activeCodes.add(44)
+        if ((codesByte3 and ALDLConstants.BIT_5) != 0) activeCodes.add(45)
+        if ((codesByte3 and ALDLConstants.BIT_4) != 0) activeCodes.add(51)
+        if ((codesByte3 and ALDLConstants.BIT_3) != 0) activeCodes.add(52)
+        if ((codesByte3 and ALDLConstants.BIT_2) != 0) activeCodes.add(53)
+        if ((codesByte3 and ALDLConstants.BIT_0) != 0) activeCodes.add(55)
+
+        val frame = ALDLFrame(
             rawBytes = data,
             iacPosition = iacPosition,
             coolantTempC = coolantTempC,
@@ -265,5 +259,6 @@ object ALDLParser {
             isPowerSteeringCrampActive = isPowerSteeringCrampActive,
             activeFaultCodes = activeCodes
         )
+        return ALDLParseResult.Success(frame)
     }
 }
diff --git a/app/src/main/java/com/example/esp32aldldashboard/parser/DerivedTelemetry.kt b/app/src/main/java/com/example/esp32aldldashboard/parser/DerivedTelemetry.kt
new file mode 100644
index 0000000..c4e0b95
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/parser/DerivedTelemetry.kt
@@ -0,0 +1,22 @@
+package com.example.esp32aldldashboard.parser
+
+// Approximate Engine Load (0.0 to 1.0)
+// Very rough approximation: MAP (kPa) / ~100 kPa (atmospheric at sea level)
+// At WOT, MAP is near atmospheric (100 kPa), load is near 100%. At idle, MAP is around 30-40 kPa, load is lower.
+val ALDLFrame.estimatedEngineLoad: Float
+    get() {
+        val load = mapKpa / 100.0f
+        return load.coerceIn(0.0f, 1.0f)
+    }
+
+// Approximate Fuel Flow Rate (lbs/hr)
+// Rough formula: RPM * BPW (ms) * Injector Flow Rate Constant
+// 2.8L Fiero V6 typically has ~15 lb/hr injectors. There are 6 injectors, firing sequentially or batch? 
+// The 1227170 ECM fires batch (3 injectors per driver, twice per cycle).
+// Rough estimation: flow = (RPM / 2) * BPW_seconds * 6 * Injector_rate / 60
+// We'll provide a simplified unitless flow hint for the UI visualization.
+val ALDLFrame.fuelFlowHint: Float
+    get() {
+        val bpwSeconds = bpwMs / 1000.0f
+        return (engineSpeedRpm * bpwSeconds) / 2.0f
+    }
diff --git a/app/src/main/java/com/example/esp32aldldashboard/parser/TroubleCodeDictionary.kt b/app/src/main/java/com/example/esp32aldldashboard/parser/TroubleCodeDictionary.kt
new file mode 100644
index 0000000..38f2156
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/parser/TroubleCodeDictionary.kt
@@ -0,0 +1,36 @@
+package com.example.esp32aldldashboard.parser
+
+object TroubleCodeDictionary {
+    val DTC_DESCRIPTIONS = mapOf(
+        12 to "Crank Sensor / System Check - Normal if engine not running.",
+        13 to "O2 Sensor Circuit - Open or No Activity.",
+        14 to "Coolant Temperature Sensor - High Temperature Indicated.",
+        15 to "Coolant Temperature Sensor - Low Temperature Indicated.",
+        21 to "Throttle Position Sensor (TPS) - High Voltage.",
+        22 to "Throttle Position Sensor (TPS) - Low Voltage.",
+        23 to "Manifold Air Temperature (MAT) - Low Temperature Indicated.",
+        24 to "Vehicle Speed Sensor (VSS) - Circuit Fault.",
+        25 to "Manifold Air Temperature (MAT) - High Temperature Indicated.",
+        32 to "Exhaust Gas Recirculation (EGR) - System Fault.",
+        33 to "Manifold Absolute Pressure (MAP) - High Pressure Indicated.",
+        34 to "Manifold Absolute Pressure (MAP) - Low Pressure Indicated.",
+        35 to "Idle Air Control (IAC) - Position Error.",
+        42 to "Electronic Spark Timing (EST) - Circuit Fault.",
+        43 to "Electronic Spark Control (ESC) - Knock Sensor Fault.",
+        44 to "Oxygen Sensor - Lean Exhaust Indicated.",
+        45 to "Oxygen Sensor - Rich Exhaust Indicated.",
+        51 to "PROM Error - Faulty or Incorrect Memcal.",
+        52 to "Cal-Pack Error - Missing or Faulty Cal-Pack.",
+        53 to "System Voltage - Battery Over-Voltage.",
+        55 to "ADU Error - Internal ECM Fault."
+    )
+
+    fun getDescription(code: Int): String {
+        return DTC_DESCRIPTIONS[code] ?: "Unknown Trouble Code $code"
+    }
+
+    fun isCritical(code: Int): Boolean {
+        // Severe codes that might require immediate pull-over
+        return code in listOf(14, 43, 51, 52, 53, 55)
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/repository/BLMTableRepository.kt b/app/src/main/java/com/example/esp32aldldashboard/repository/BLMTableRepository.kt
new file mode 100644
index 0000000..12f522b
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/repository/BLMTableRepository.kt
@@ -0,0 +1,122 @@
+package com.example.esp32aldldashboard.repository
+
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlin.math.abs
+
+data class BLMCellData(
+    val blm: Int = 128,
+    val intValue: Int = 128,
+    val updateCount: Int = 0,
+    val lastUpdateTime: Long = 0
+)
+
+class BLMTableRepository {
+
+    // RPM bands as specified by ECM
+    val rpmBands = listOf(600, 800, 1000, 1200, 1400, 1600, 2000, 2400, 2800, 3200, 3600, 4000, 4400, 4800)
+    
+    // MAP bands as specified by ECM
+    val mapBands = listOf(20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100)
+    
+    private val rowCount = rpmBands.size
+    private val colCount = mapBands.size
+    
+    // 2D array [RPM bands × MAP bands]
+    private val _tableData = MutableStateFlow(
+        Array(rowCount) { Array(colCount) { BLMCellData() } }
+    )
+    val tableData: StateFlow<Array<Array<BLMCellData>>> = _tableData
+    
+    /**
+     * Updates the cell corresponding to the nearest RPM and MAP bands.
+     * Values are retained until replaced by new updates.
+     */
+    fun updateCell(rpm: Int, mapKpa: Float, blm: Int, intValue: Int) {
+        val rpmIndex = findNearestBandIndex(rpm, rpmBands)
+        val mapIndex = findNearestBandIndex(mapKpa.toInt(), mapBands)
+        
+        if (rpmIndex >= 0 && rpmIndex < rowCount && mapIndex >= 0 && mapIndex < colCount) {
+            val currentData = _tableData.value
+            val newData = currentData.map { row -> row.map { it }.toTypedArray() }.toTypedArray()
+            
+            val existing = newData[rpmIndex][mapIndex]
+            newData[rpmIndex][mapIndex] = BLMCellData(
+                blm = blm,
+                intValue = intValue,
+                updateCount = existing.updateCount + 1,
+                lastUpdateTime = System.currentTimeMillis()
+            )
+            
+            _tableData.value = newData
+        }
+    }
+    
+    /**
+     * Clears all table data, resetting to default values.
+     */
+    fun clearTable() {
+        _tableData.value = Array(rowCount) { Array(colCount) { BLMCellData() } }
+    }
+    
+    /**
+     * Gets the color for a BLM value.
+     * Blue at 128 (center), Green at 120 (lean), Red at 150 (rich)
+     * Returns ARGB color value
+     */
+    fun getBLMColor(blm: Int): Long {
+        return when {
+            blm <= 120 -> {
+                // Green (120 and below)
+                0xFF00E676
+            }
+            blm >= 150 -> {
+                // Red (150 and above)
+                0xFFFF3D00
+            }
+            blm <= 128 -> {
+                // Interpolate between Green (120) and Blue (128)
+                val fraction = (blm - 120) / 8f
+                interpolateColor(0xFF00E676, 0xFF2196F3, fraction)
+            }
+            else -> {
+                // Interpolate between Blue (128) and Red (150)
+                val fraction = (blm - 128) / 22f
+                interpolateColor(0xFF2196F3, 0xFFFF3D00, fraction)
+            }
+        }
+    }
+    
+    private fun interpolateColor(color1: Long, color2: Long, fraction: Float): Long {
+        val r1 = (color1 shr 16) and 0xFF
+        val g1 = (color1 shr 8) and 0xFF
+        val b1 = color1 and 0xFF
+        
+        val r2 = (color2 shr 16) and 0xFF
+        val g2 = (color2 shr 8) and 0xFF
+        val b2 = color2 and 0xFF
+        
+        val r = (r1 + (r2 - r1) * fraction).toInt()
+        val g = (g1 + (g2 - g1) * fraction).toInt()
+        val b = (b1 + (b2 - b1) * fraction).toInt()
+        
+        return 0xFF000000 or (r.toLong() shl 16) or (g.toLong() shl 8) or b.toLong()
+    }
+    
+    private fun findNearestBandIndex(value: Int, bands: List<Int>): Int {
+        if (bands.isEmpty()) return -1
+        
+        var nearestIndex = 0
+        var minDiff = abs(value - bands[0])
+        
+        for (i in 1 until bands.size) {
+            val diff = abs(value - bands[i])
+            if (diff < minDiff) {
+                minDiff = diff
+                nearestIndex = i
+            }
+        }
+        
+        return nearestIndex
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/repository/ChartPreferencesRepository.kt b/app/src/main/java/com/example/esp32aldldashboard/repository/ChartPreferencesRepository.kt
new file mode 100644
index 0000000..a915748
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/repository/ChartPreferencesRepository.kt
@@ -0,0 +1,96 @@
+package com.example.esp32aldldashboard.repository
+
+import android.content.Context
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.*
+import androidx.datastore.preferences.preferencesDataStore
+import com.example.esp32aldldashboard.ui.charts.ChartParameter
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
+
+val Context.chartPreferencesDataStore: DataStore<Preferences> by preferencesDataStore(name = "chart_preferences")
+
+class ChartPreferencesRepository(private val context: Context) {
+
+    companion object {
+        val CHART_VIEW_MODE = stringPreferencesKey("chart_view_mode")
+        val SELECTED_PARAMETERS = stringSetPreferencesKey("selected_parameters")
+        val SINGLE_CHART_PARAMETER = stringPreferencesKey("single_chart_parameter")
+    }
+
+    enum class ViewMode {
+        SINGLE, MULTI
+    }
+
+    val viewModeFlow: Flow<ViewMode> = context.chartPreferencesDataStore.data
+        .map { preferences ->
+            val modeString = preferences[CHART_VIEW_MODE] ?: ViewMode.MULTI.name
+            try {
+                ViewMode.valueOf(modeString)
+            } catch (e: IllegalArgumentException) {
+                ViewMode.MULTI
+            }
+        }
+
+    val selectedParametersFlow: Flow<Set<ChartParameter>> = context.chartPreferencesDataStore.data
+        .map { preferences ->
+            val paramNames = preferences[SELECTED_PARAMETERS] ?: setOf(
+                ChartParameter.RPM.name,
+                ChartParameter.MAP.name,
+                ChartParameter.TPS.name,
+                ChartParameter.O2_SENSOR.name
+            )
+            paramNames.mapNotNull { name ->
+                try {
+                    ChartParameter.valueOf(name)
+                } catch (e: IllegalArgumentException) {
+                    null
+                }
+            }.toSet()
+        }
+
+    val singleChartParameterFlow: Flow<ChartParameter> = context.chartPreferencesDataStore.data
+        .map { preferences ->
+            val paramName = preferences[SINGLE_CHART_PARAMETER] ?: ChartParameter.RPM.name
+            try {
+                ChartParameter.valueOf(paramName)
+            } catch (e: IllegalArgumentException) {
+                ChartParameter.RPM
+            }
+        }
+
+    suspend fun setViewMode(mode: ViewMode) {
+        context.chartPreferencesDataStore.edit { preferences ->
+            preferences[CHART_VIEW_MODE] = mode.name
+        }
+    }
+
+    suspend fun setSelectedParameters(parameters: Set<ChartParameter>) {
+        context.chartPreferencesDataStore.edit { preferences ->
+            preferences[SELECTED_PARAMETERS] = parameters.map { it.name }.toSet()
+        }
+    }
+
+    suspend fun setSingleChartParameter(parameter: ChartParameter) {
+        context.chartPreferencesDataStore.edit { preferences ->
+            preferences[SINGLE_CHART_PARAMETER] = parameter.name
+        }
+    }
+
+    suspend fun toggleParameter(parameter: ChartParameter) {
+        context.chartPreferencesDataStore.edit { preferences ->
+            val current = preferences[SELECTED_PARAMETERS] ?: setOf(
+                ChartParameter.RPM.name,
+                ChartParameter.MAP.name,
+                ChartParameter.TPS.name,
+                ChartParameter.O2_SENSOR.name
+            )
+            val updated = if (current.contains(parameter.name)) {
+                current - parameter.name
+            } else {
+                current + parameter.name
+            }
+            preferences[SELECTED_PARAMETERS] = updated
+        }
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/repository/SettingsRepository.kt b/app/src/main/java/com/example/esp32aldldashboard/repository/SettingsRepository.kt
new file mode 100644
index 0000000..45a53d8
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/repository/SettingsRepository.kt
@@ -0,0 +1,205 @@
+package com.example.esp32aldldashboard.repository
+
+import android.content.ContentUris
+import android.content.Context
+import android.net.Uri
+import android.os.Build
+import android.os.Environment
+import android.provider.MediaStore
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.*
+import androidx.datastore.preferences.preferencesDataStore
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.withContext
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+
+val Context.dataStore: DataStore<Preferences> by preferencesDataStore(name = "settings")
+
+class SettingsRepository(private val context: Context) {
+
+    companion object {
+        val IS_CELSIUS = booleanPreferencesKey("is_celsius")
+        val COOLANT_ALERT_THRESHOLD = floatPreferencesKey("coolant_alert_threshold")
+        val BATTERY_LOW_THRESHOLD = floatPreferencesKey("battery_low_threshold")
+        val AUTO_LOGGING = booleanPreferencesKey("auto_logging")
+        val RECORD_RAW_DATA = booleanPreferencesKey("record_raw_data")
+    }
+
+    val isCelsiusFlow: Flow<Boolean> = context.dataStore.data
+        .map { preferences ->
+            preferences[IS_CELSIUS] ?: false // Default to Fahrenheit
+        }
+
+    val coolantAlertThresholdFlow: Flow<Float> = context.dataStore.data
+        .map { preferences ->
+            preferences[COOLANT_ALERT_THRESHOLD] ?: 100f // Default 100C / 212F
+        }
+
+    val batteryLowThresholdFlow: Flow<Float> = context.dataStore.data
+        .map { preferences ->
+            preferences[BATTERY_LOW_THRESHOLD] ?: 11.5f // Default 11.5V
+        }
+        
+    val autoLoggingFlow: Flow<Boolean> = context.dataStore.data
+        .map { preferences ->
+            preferences[AUTO_LOGGING] ?: false
+        }
+
+    val recordRawDataFlow: Flow<Boolean> = context.dataStore.data
+        .map { preferences ->
+            preferences[RECORD_RAW_DATA] ?: false
+        }
+
+    suspend fun setIsCelsius(isCelsius: Boolean) {
+        context.dataStore.edit { preferences ->
+            preferences[IS_CELSIUS] = isCelsius
+        }
+    }
+
+    suspend fun setCoolantAlertThreshold(threshold: Float) {
+        context.dataStore.edit { preferences ->
+            preferences[COOLANT_ALERT_THRESHOLD] = threshold
+        }
+    }
+
+    suspend fun setBatteryLowThreshold(threshold: Float) {
+        context.dataStore.edit { preferences ->
+            preferences[BATTERY_LOW_THRESHOLD] = threshold
+        }
+    }
+
+    suspend fun setAutoLogging(autoLog: Boolean) {
+        context.dataStore.edit { preferences ->
+            preferences[AUTO_LOGGING] = autoLog
+        }
+    }
+
+    suspend fun setRecordRawData(recordRaw: Boolean) {
+        context.dataStore.edit { preferences ->
+            preferences[RECORD_RAW_DATA] = recordRaw
+        }
+    }
+
+    /**
+     * Queries MediaStore for logged files (CSV and .bin) in Downloads/ALDLLogs
+     */
+    suspend fun getLoggedFiles(): List<LoggedFile> = withContext(Dispatchers.IO) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
+            return@withContext emptyList() // Legacy not supported for this feature
+        }
+
+        val files = mutableListOf<LoggedFile>()
+        val resolver = context.contentResolver
+
+        val projection = arrayOf(
+            MediaStore.MediaColumns._ID,
+            MediaStore.MediaColumns.DISPLAY_NAME,
+            MediaStore.MediaColumns.SIZE,
+            MediaStore.MediaColumns.DATE_MODIFIED,
+            MediaStore.MediaColumns.MIME_TYPE
+        )
+
+        // Query for CSV files
+        val csvSelection = "${MediaStore.MediaColumns.RELATIVE_PATH} LIKE ? AND ${MediaStore.MediaColumns.DISPLAY_NAME} LIKE ?"
+        val csvSelectionArgs = arrayOf("%${Environment.DIRECTORY_DOWNLOADS}/ALDLLogs%", "%.csv")
+
+        resolver.query(
+            MediaStore.Downloads.EXTERNAL_CONTENT_URI,
+            projection,
+            csvSelection,
+            csvSelectionArgs,
+            "${MediaStore.MediaColumns.DATE_MODIFIED} DESC"
+        )?.use { cursor ->
+            val idColumn = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns._ID)
+            val nameColumn = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DISPLAY_NAME)
+            val sizeColumn = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.SIZE)
+            val dateColumn = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATE_MODIFIED)
+
+            while (cursor.moveToNext()) {
+                val id = cursor.getLong(idColumn)
+                val name = cursor.getString(nameColumn)
+                val size = cursor.getLong(sizeColumn)
+                val dateModified = cursor.getLong(dateColumn)
+                val uri = ContentUris.withAppendedId(MediaStore.Downloads.EXTERNAL_CONTENT_URI, id)
+
+                files.add(
+                    LoggedFile(
+                        uri = uri,
+                        name = name,
+                        size = size,
+                        lastModified = dateModified * 1000, // Convert to milliseconds
+                        type = FileType.CSV
+                    )
+                )
+            }
+        }
+
+        // Query for binary files (.bin)
+        val binSelection = "${MediaStore.MediaColumns.RELATIVE_PATH} LIKE ? AND ${MediaStore.MediaColumns.DISPLAY_NAME} LIKE ?"
+        val binSelectionArgs = arrayOf("%${Environment.DIRECTORY_DOWNLOADS}/ALDLLogs%", "%.bin")
+
+        resolver.query(
+            MediaStore.Downloads.EXTERNAL_CONTENT_URI,
+            projection,
+            binSelection,
+            binSelectionArgs,
+            "${MediaStore.MediaColumns.DATE_MODIFIED} DESC"
+        )?.use { cursor ->
+            val idColumn = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns._ID)
+            val nameColumn = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DISPLAY_NAME)
+            val sizeColumn = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.SIZE)
+            val dateColumn = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATE_MODIFIED)
+
+            while (cursor.moveToNext()) {
+                val id = cursor.getLong(idColumn)
+                val name = cursor.getString(nameColumn)
+                val size = cursor.getLong(sizeColumn)
+                val dateModified = cursor.getLong(dateColumn)
+                val uri = ContentUris.withAppendedId(MediaStore.Downloads.EXTERNAL_CONTENT_URI, id)
+
+                files.add(
+                    LoggedFile(
+                        uri = uri,
+                        name = name,
+                        size = size,
+                        lastModified = dateModified * 1000,
+                        type = FileType.BINARY
+                    )
+                )
+            }
+        }
+
+        // Sort by date descending
+        files.sortByDescending { it.lastModified }
+        files
+    }
+}
+
+data class LoggedFile(
+    val uri: Uri,
+    val name: String,
+    val size: Long,
+    val lastModified: Long,
+    val type: FileType
+) {
+    fun getFormattedSize(): String {
+        return when {
+            size < 1024 -> "$size B"
+            size < 1024 * 1024 -> "${size / 1024} KB"
+            else -> "${size / (1024 * 1024)} MB"
+        }
+    }
+
+    fun getFormattedDate(): String {
+        val sdf = SimpleDateFormat("yyyy-MM-dd HH:mm", Locale.getDefault())
+        return sdf.format(Date(lastModified))
+    }
+}
+
+enum class FileType {
+    CSV, BINARY
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/repository/TelemetryRepository.kt b/app/src/main/java/com/example/esp32aldldashboard/repository/TelemetryRepository.kt
new file mode 100644
index 0000000..43705d6
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/repository/TelemetryRepository.kt
@@ -0,0 +1,144 @@
+package com.example.esp32aldldashboard.repository
+
+import android.content.Context
+import android.content.Intent
+import com.example.esp32aldldashboard.bluetooth.BluetoothService
+import com.example.esp32aldldashboard.bluetooth.BluetoothForegroundService
+import com.example.esp32aldldashboard.bluetooth.ConnectionState
+import com.example.esp32aldldashboard.parser.ALDLFrame
+import com.example.esp32aldldashboard.data.database.SessionEntity
+import com.example.esp32aldldashboard.data.database.TelemetryDao
+import com.example.esp32aldldashboard.data.database.TelemetryDataPointEntity
+import com.example.esp32aldldashboard.logging.CsvLogger
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.flow.StateFlow
+
+class TelemetryRepository(
+    private val context: Context,
+    private val bluetoothService: BluetoothService,
+    private val telemetryDao: TelemetryDao,
+    private val csvLogger: CsvLogger,
+    private val settingsRepository: SettingsRepository,
+    private val blmTableRepository: BLMTableRepository
+) {
+    private val repoScope = CoroutineScope(Dispatchers.IO + Job())
+    private var currentSessionId: Long? = null
+    private var isRecording = false
+
+    init {
+        observeConnectionState()
+        observeTelemetry()
+    }
+
+    val connectionState: StateFlow<ConnectionState> = bluetoothService.connectionState
+    val latestFrame: StateFlow<ALDLFrame?> = bluetoothService.latestFrame
+    val rawHexLog: StateFlow<List<String>> = bluetoothService.rawHexLog
+    
+    val framesReceived: StateFlow<Int> = bluetoothService.framesReceived
+    val parseErrors: StateFlow<Int> = bluetoothService.parseErrors
+    val currentFrameRate: StateFlow<Int> = bluetoothService.currentFrameRate
+    val errorMessage: StateFlow<String> = bluetoothService.errorMessage
+
+    private fun observeConnectionState() {
+        repoScope.launch {
+            bluetoothService.connectionState.collectLatest { state ->
+                when (state) {
+                    ConnectionState.CONNECTED -> {
+                        val autoLog = settingsRepository.autoLoggingFlow.first()
+                        if (autoLog) {
+                            startSession(isSimulation = false) // Or true if we knew
+                        }
+                    }
+                    ConnectionState.DISCONNECTED, ConnectionState.ERROR -> {
+                        endSession()
+                    }
+                    else -> {}
+                }
+            }
+        }
+    }
+
+    private fun observeTelemetry() {
+        repoScope.launch {
+            bluetoothService.latestFrame.collectLatest { frame ->
+                if (frame != null) {
+                    // Update BLM table with every frame (not just when recording)
+                    blmTableRepository.updateCell(
+                        rpm = frame.engineSpeedRpm,
+                        mapKpa = frame.mapKpa,
+                        blm = frame.blm,
+                        intValue = frame.integrator
+                    )
+                    
+                    if (isRecording) {
+                        csvLogger.logFrame(frame)
+                        currentSessionId?.let { sid ->
+                            val dataPoint = TelemetryDataPointEntity(
+                                sessionId = sid,
+                                timestamp = frame.timestamp,
+                                rawBytes = frame.rawBytes
+                            )
+                            telemetryDao.insertDataPoints(listOf(dataPoint))
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    private suspend fun startSession(isSimulation: Boolean) {
+        if (isRecording) return
+        val session = SessionEntity(
+            startTime = System.currentTimeMillis(),
+            name = "Session ${System.currentTimeMillis()}",
+            isSimulation = isSimulation
+        )
+        currentSessionId = telemetryDao.insertSession(session)
+        csvLogger.startNewSession(isSimulation)
+        isRecording = true
+    }
+
+    private suspend fun endSession() {
+        if (!isRecording) return
+        isRecording = false
+        csvLogger.endSession()
+        currentSessionId?.let { sid ->
+            telemetryDao.endSession(sid, System.currentTimeMillis())
+        }
+        currentSessionId = null
+    }
+
+    fun connect() {
+        startForegroundService()
+        bluetoothService.connect()
+    }
+
+    fun disconnect() {
+        stopForegroundService()
+        bluetoothService.disconnect()
+    }
+
+    fun startSimulation() {
+        startForegroundService()
+        bluetoothService.startSimulation()
+    }
+
+    private fun startForegroundService() {
+        val intent = Intent(context, BluetoothForegroundService::class.java).apply {
+            action = BluetoothForegroundService.ACTION_START
+        }
+        context.startForegroundService(intent)
+    }
+
+    private fun stopForegroundService() {
+        val intent = Intent(context, BluetoothForegroundService::class.java).apply {
+            action = BluetoothForegroundService.ACTION_STOP
+        }
+        context.startService(intent)
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/ui/blm/BLMTableScreen.kt b/app/src/main/java/com/example/esp32aldldashboard/ui/blm/BLMTableScreen.kt
new file mode 100644
index 0000000..486da2b
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/ui/blm/BLMTableScreen.kt
@@ -0,0 +1,229 @@
+package com.example.esp32aldldashboard.ui.blm
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.horizontalScroll
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.*
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.example.esp32aldldashboard.repository.BLMTableRepository
+
+@Composable
+fun BLMTableScreen(
+    viewModel: BLMTableViewModel,
+    modifier: Modifier = Modifier
+) {
+    val tableData by viewModel.tableData.collectAsStateWithLifecycle()
+    val rpmBands = viewModel.rpmBands
+    val mapBands = viewModel.mapBands
+
+    Column(
+        modifier = modifier
+            .fillMaxSize()
+            .padding(16.dp)
+            .verticalScroll(rememberScrollState())
+    ) {
+        // Header with title and clear button
+        Row(
+            modifier = Modifier.fillMaxWidth(),
+            horizontalArrangement = Arrangement.SpaceBetween,
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            Column {
+                Text(
+                    text = "BLM/INT Table",
+                    style = MaterialTheme.typography.headlineMedium,
+                    color = MaterialTheme.colorScheme.onBackground
+                )
+                Text(
+                    text = "RPM (vertical) × MAP (horizontal)",
+                    style = MaterialTheme.typography.bodyMedium,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            }
+            
+            Button(
+                onClick = { viewModel.clearTable() },
+                colors = ButtonDefaults.buttonColors(
+                    containerColor = MaterialTheme.colorScheme.error
+                )
+            ) {
+                Text("Clear")
+            }
+        }
+        
+        Spacer(modifier = Modifier.height(16.dp))
+        
+        // Legend
+        BLMLegend()
+        
+        Spacer(modifier = Modifier.height(16.dp))
+        
+        // Table container
+        Column(
+            modifier = Modifier.horizontalScroll(rememberScrollState())
+        ) {
+            // MAP headers (top)
+            Row {
+                // Empty corner cell
+                Box(
+                    modifier = Modifier
+                        .size(60.dp)
+                        .background(Color(0xFF2C2C2C))
+                        .border(1.dp, Color(0xFF3C3C3C)),
+                    contentAlignment = Alignment.Center
+                ) {
+                    Text(
+                        text = "RPM\\MAP",
+                        fontSize = 10.sp,
+                        color = Color.Gray,
+                        textAlign = TextAlign.Center
+                    )
+                }
+                
+                // MAP band headers
+                mapBands.forEach { map ->
+                    Box(
+                        modifier = Modifier
+                            .width(50.dp)
+                            .height(60.dp)
+                            .background(Color(0xFF2C2C2C))
+                            .border(1.dp, Color(0xFF3C3C3C)),
+                        contentAlignment = Alignment.Center
+                    ) {
+                        Text(
+                            text = "$map",
+                            fontSize = 11.sp,
+                            fontWeight = FontWeight.Bold,
+                            color = Color(0xFF00E5FF),
+                            textAlign = TextAlign.Center
+                        )
+                    }
+                }
+            }
+            
+            // Data rows
+            rpmBands.forEachIndexed { rowIndex, rpm ->
+                Row {
+                    // RPM band header (left)
+                    Box(
+                        modifier = Modifier
+                            .width(60.dp)
+                            .height(50.dp)
+                            .background(Color(0xFF2C2C2C))
+                            .border(1.dp, Color(0xFF3C3C3C)),
+                        contentAlignment = Alignment.Center
+                    ) {
+                        Text(
+                            text = "$rpm",
+                            fontSize = 11.sp,
+                            fontWeight = FontWeight.Bold,
+                            color = Color(0xFF00E5FF),
+                            textAlign = TextAlign.Center
+                        )
+                    }
+                    
+                    // Data cells
+                    if (rowIndex < tableData.size) {
+                        tableData[rowIndex].forEach { cell ->
+                            val colorArgb = viewModel.getBLMColor(cell.blm)
+                            val cellColor = Color(colorArgb)
+                            
+                            Box(
+                                modifier = Modifier
+                                    .width(50.dp)
+                                    .height(50.dp)
+                                    .background(cellColor.copy(alpha = 0.3f))
+                                    .border(1.dp, cellColor),
+                                contentAlignment = Alignment.Center
+                            ) {
+                                Column(horizontalAlignment = Alignment.CenterHorizontally) {
+                                    Text(
+                                        text = "${cell.blm}",
+                                        fontSize = 14.sp,
+                                        fontWeight = FontWeight.Bold,
+                                        color = if (cell.blm > 140 || cell.blm < 116) Color.White else Color.Black
+                                    )
+                                    Text(
+                                        text = "${cell.intValue}",
+                                        fontSize = 10.sp,
+                                        color = if (cell.blm > 140 || cell.blm < 116) Color.White.copy(alpha = 0.7f) else Color.Black.copy(alpha = 0.7f)
+                                    )
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        
+        Spacer(modifier = Modifier.height(24.dp))
+    }
+}
+
+@Composable
+private fun BLMLegend() {
+    Card(
+        modifier = Modifier.fillMaxWidth(),
+        colors = CardDefaults.cardColors(containerColor = Color(0xFF1E1E1E))
+    ) {
+        Column(modifier = Modifier.padding(12.dp)) {
+            Text(
+                text = "Color Legend",
+                fontSize = 12.sp,
+                fontWeight = FontWeight.Bold,
+                color = MaterialTheme.colorScheme.onBackground
+            )
+            
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.SpaceEvenly
+            ) {
+                LegendItem(color = Color(0xFF00E676), label = "≤120 Lean", textColor = Color.White)
+                LegendItem(color = Color(0xFF2196F3), label = "128 Ideal", textColor = Color.White)
+                LegendItem(color = Color(0xFFFF3D00), label = "≥150 Rich", textColor = Color.White)
+            }
+            
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            Text(
+                text = "BLM = Block Learn Multiplier (fuel trim). INT = Integrator (short-term correction). Values show most recent update.",
+                fontSize = 10.sp,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                textAlign = TextAlign.Center,
+                modifier = Modifier.fillMaxWidth()
+            )
+        }
+    }
+}
+
+@Composable
+private fun LegendItem(color: Color, label: String, textColor: Color) {
+    Row(verticalAlignment = Alignment.CenterVertically) {
+        Box(
+            modifier = Modifier
+                .size(16.dp)
+                .background(color, shape = RoundedCornerShape(2.dp))
+        )
+        Spacer(modifier = Modifier.width(4.dp))
+        Text(
+            text = label,
+            fontSize = 10.sp,
+            color = textColor
+        )
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/ui/blm/BLMTableViewModel.kt b/app/src/main/java/com/example/esp32aldldashboard/ui/blm/BLMTableViewModel.kt
new file mode 100644
index 0000000..af6ae4a
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/ui/blm/BLMTableViewModel.kt
@@ -0,0 +1,32 @@
+package com.example.esp32aldldashboard.ui.blm
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import com.example.esp32aldldashboard.repository.BLMCellData
+import com.example.esp32aldldashboard.repository.BLMTableRepository
+import kotlinx.coroutines.flow.StateFlow
+
+class BLMTableViewModel(private val repository: BLMTableRepository) : ViewModel() {
+
+    val tableData: StateFlow<Array<Array<BLMCellData>>> = repository.tableData
+    val rpmBands: List<Int> = repository.rpmBands
+    val mapBands: List<Int> = repository.mapBands
+
+    fun clearTable() {
+        repository.clearTable()
+    }
+
+    fun getBLMColor(blm: Int): Long {
+        return repository.getBLMColor(blm)
+    }
+}
+
+class BLMTableViewModelFactory(private val repository: BLMTableRepository) : ViewModelProvider.Factory {
+    override fun <T : ViewModel> create(modelClass: Class<T>): T {
+        if (modelClass.isAssignableFrom(BLMTableViewModel::class.java)) {
+            @Suppress("UNCHECKED_CAST")
+            return BLMTableViewModel(repository) as T
+        }
+        throw IllegalArgumentException("Unknown ViewModel class")
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/ui/charts/ChartParameter.kt b/app/src/main/java/com/example/esp32aldldashboard/ui/charts/ChartParameter.kt
new file mode 100644
index 0000000..38dbdbe
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/ui/charts/ChartParameter.kt
@@ -0,0 +1,84 @@
+package com.example.esp32aldldashboard.ui.charts
+
+import androidx.compose.ui.graphics.Color
+import com.example.esp32aldldashboard.parser.ALDLFrame
+
+enum class ChartParameter(
+    val displayName: String,
+    val color: Color,
+    val maxValue: Float,
+    val extractValue: (ALDLFrame) -> Float
+) {
+    RPM(
+        displayName = "RPM",
+        color = Color(0xFF00FFCC),
+        maxValue = 6000f,
+        extractValue = { it.engineSpeedRpm.toFloat() }
+    ),
+    COOLANT_TEMP(
+        displayName = "Coolant Temp",
+        color = Color(0xFFFF5722),
+        maxValue = 250f,
+        extractValue = { it.coolantTempC }
+    ),
+    MAP(
+        displayName = "MAP",
+        color = Color(0xFF2196F3),
+        maxValue = 105f,
+        extractValue = { it.mapKpa }
+    ),
+    TPS(
+        displayName = "TPS",
+        color = Color(0xFF9C27B0),
+        maxValue = 5.5f,
+        extractValue = { it.tpsVolts }
+    ),
+    O2_SENSOR(
+        displayName = "O2 Sensor",
+        color = Color(0xFF4CAF50),
+        maxValue = 1000f,
+        extractValue = { it.o2SensorMv }
+    ),
+    BATTERY(
+        displayName = "Battery",
+        color = Color(0xFFFFEB3B),
+        maxValue = 16f,
+        extractValue = { it.batteryVolts }
+    ),
+    SPARK_ADVANCE(
+        displayName = "Spark Advance",
+        color = Color(0xFF00BCD4),
+        maxValue = 40f,
+        extractValue = { it.sparkAdvance }
+    ),
+    BPW(
+        displayName = "BPW",
+        color = Color(0xFFE91E63),
+        maxValue = 15f,
+        extractValue = { it.bpwMs }
+    ),
+    MAT(
+        displayName = "MAT",
+        color = Color(0xFF795548),
+        maxValue = 80f,
+        extractValue = { it.matC }
+    ),
+    BLM(
+        displayName = "BLM",
+        color = Color(0xFF3F51B5),
+        maxValue = 160f,
+        extractValue = { it.blm.toFloat() }
+    ),
+    INTEGRATOR(
+        displayName = "Integrator",
+        color = Color(0xFF607D8B),
+        maxValue = 255f,
+        extractValue = { it.integrator.toFloat() }
+    ),
+    IAC(
+        displayName = "IAC Position",
+        color = Color(0xFFFF9800),
+        maxValue = 255f,
+        extractValue = { it.iacPosition.toFloat() }
+    )
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/ui/charts/ChartsScreen.kt b/app/src/main/java/com/example/esp32aldldashboard/ui/charts/ChartsScreen.kt
new file mode 100644
index 0000000..871e6ba
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/ui/charts/ChartsScreen.kt
@@ -0,0 +1,347 @@
+@file:OptIn(androidx.compose.material3.ExperimentalMaterial3Api::class)
+package com.example.esp32aldldashboard.ui.charts
+
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.foundation.Canvas
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyRow
+import androidx.compose.foundation.lazy.items
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.Path
+import androidx.compose.ui.graphics.drawscope.Stroke
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.example.esp32aldldashboard.parser.ALDLFrame
+import com.example.esp32aldldashboard.repository.ChartPreferencesRepository
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
+
+@Composable
+fun ChartsScreen(
+    latestFrameFlow: StateFlow<ALDLFrame?>,
+    chartPreferencesRepository: ChartPreferencesRepository,
+    modifier: Modifier = Modifier
+) {
+    val latestFrame by latestFrameFlow.collectAsStateWithLifecycle()
+    val viewMode by chartPreferencesRepository.viewModeFlow.collectAsStateWithLifecycle(
+        initialValue = ChartPreferencesRepository.ViewMode.MULTI
+    )
+    val selectedParameters by chartPreferencesRepository.selectedParametersFlow.collectAsStateWithLifecycle(
+        initialValue = setOf(ChartParameter.RPM, ChartParameter.MAP, ChartParameter.TPS, ChartParameter.O2_SENSOR)
+    )
+    val singleChartParameter by chartPreferencesRepository.singleChartParameterFlow.collectAsStateWithLifecycle(
+        initialValue = ChartParameter.RPM
+    )
+
+    // History storage for all parameters
+    val maxHistorySize = 100
+    val histories = remember {
+        mutableStateMapOf<ChartParameter, MutableList<Float>>().apply {
+            ChartParameter.values().forEach { put(it, mutableStateListOf()) }
+        }
+    }
+
+    LaunchedEffect(latestFrame) {
+        latestFrame?.let { frame ->
+            ChartParameter.values().forEach { param ->
+                val history = histories.getOrPut(param) { mutableStateListOf() }
+                history.add(param.extractValue(frame))
+                if (history.size > maxHistorySize) {
+                    history.removeAt(0)
+                }
+            }
+        }
+    }
+
+    val coroutineScope = rememberCoroutineScope()
+
+    Column(modifier = modifier.fillMaxSize().padding(16.dp)) {
+        // Header with view mode toggle
+        Row(
+            modifier = Modifier.fillMaxWidth(),
+            horizontalArrangement = Arrangement.SpaceBetween,
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            Text(
+                text = "Real-Time Telemetry",
+                style = MaterialTheme.typography.headlineMedium,
+                color = MaterialTheme.colorScheme.onBackground
+            )
+            
+            // View mode toggle
+            Row {
+                FilterChip(
+                    selected = viewMode == ChartPreferencesRepository.ViewMode.SINGLE,
+                    onClick = {
+                        coroutineScope.launch {
+                            chartPreferencesRepository.setViewMode(
+                                if (viewMode == ChartPreferencesRepository.ViewMode.SINGLE) 
+                                    ChartPreferencesRepository.ViewMode.MULTI 
+                                else 
+                                    ChartPreferencesRepository.ViewMode.SINGLE
+                            )
+                        }
+                    },
+                    label = { Text(if (viewMode == ChartPreferencesRepository.ViewMode.SINGLE) "Single" else "Multi") }
+                )
+            }
+        }
+        
+        Spacer(modifier = Modifier.height(16.dp))
+
+        when (viewMode) {
+            ChartPreferencesRepository.ViewMode.SINGLE -> {
+                // Single chart mode
+                SingleChartView(
+                    selectedParameter = singleChartParameter,
+                    history = histories[singleChartParameter] ?: emptyList(),
+                    onParameterChange = { param ->
+                        coroutineScope.launch {
+                            chartPreferencesRepository.setSingleChartParameter(param)
+                        }
+                    }
+                )
+            }
+            ChartPreferencesRepository.ViewMode.MULTI -> {
+                // Multi chart mode
+                MultiChartView(
+                    selectedParameters = selectedParameters,
+                    histories = histories,
+                    onToggleParameter = { param ->
+                        coroutineScope.launch {
+                            chartPreferencesRepository.toggleParameter(param)
+                        }
+                    }
+                )
+            }
+        }
+    }
+}
+
+@Composable
+private fun SingleChartView(
+    selectedParameter: ChartParameter,
+    history: List<Float>,
+    onParameterChange: (ChartParameter) -> Unit
+) {
+    Column {
+        // Parameter selector dropdown
+        var expanded by remember { mutableStateOf(false) }
+        ExposedDropdownMenuBox(
+            expanded = expanded,
+            onExpandedChange = { expanded = it }
+        ) {
+            OutlinedTextField(
+                value = selectedParameter.displayName,
+                onValueChange = {},
+                readOnly = true,
+                label = { Text("Parameter") },
+                trailingIcon = { ExposedDropdownMenuDefaults.TrailingIcon(expanded = expanded) },
+                modifier = Modifier.menuAnchor().fillMaxWidth()
+            )
+            ExposedDropdownMenu(
+                expanded = expanded,
+                onDismissRequest = { expanded = false }
+            ) {
+                ChartParameter.values().forEach { param ->
+                    DropdownMenuItem(
+                        text = { Text(param.displayName) },
+                        onClick = {
+                            onParameterChange(param)
+                            expanded = false }
+                    )
+                }
+            }
+        }
+        
+        Spacer(modifier = Modifier.height(16.dp))
+        
+        // Large single chart
+        Card(
+            modifier = Modifier.fillMaxWidth().height(300.dp),
+            colors = CardDefaults.cardColors(containerColor = Color(0xFF1E1E1E))
+        ) {
+            Column(modifier = Modifier.padding(16.dp)) {
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween
+                ) {
+                    Text(
+                        text = selectedParameter.displayName,
+                        color = selectedParameter.color,
+                        style = MaterialTheme.typography.titleMedium
+                    )
+                    if (history.isNotEmpty()) {
+                        Text(
+                            text = String.format("%.1f", history.last()),
+                            color = selectedParameter.color,
+                            style = MaterialTheme.typography.titleMedium
+                        )
+                    }
+                }
+                Spacer(modifier = Modifier.height(8.dp))
+                LineChart(
+                    data = history,
+                    maxValue = selectedParameter.maxValue,
+                    lineColor = selectedParameter.color,
+                    modifier = Modifier.fillMaxSize()
+                )
+            }
+        }
+    }
+}
+
+@Composable
+private fun MultiChartView(
+    selectedParameters: Set<ChartParameter>,
+    histories: Map<ChartParameter, List<Float>>,
+    onToggleParameter: (ChartParameter) -> Unit
+) {
+    Column {
+        // Parameter toggle chips
+        LazyRow(
+            horizontalArrangement = Arrangement.spacedBy(8.dp),
+            modifier = Modifier.fillMaxWidth()
+        ) {
+            items(ChartParameter.values().toList()) { param ->
+                val isSelected = selectedParameters.contains(param)
+                FilterChip(
+                    selected = isSelected,
+                    onClick = { onToggleParameter(param) },
+                    label = { Text(param.displayName) },
+                    colors = FilterChipDefaults.filterChipColors(
+                        selectedContainerColor = param.color.copy(alpha = 0.3f),
+                        selectedLabelColor = param.color
+                    )
+                )
+            }
+        }
+        
+        Spacer(modifier = Modifier.height(16.dp))
+        
+        // 2x2 grid of charts (up to 4)
+        val activeParams = selectedParameters.take(4)
+        
+        if (activeParams.isEmpty()) {
+            Box(
+                modifier = Modifier.fillMaxWidth().height(200.dp),
+                contentAlignment = Alignment.Center
+            ) {
+                Text(
+                    text = "Select parameters above to display charts",
+                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            }
+        } else {
+            Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
+                activeParams.chunked(2).forEach { rowParams ->
+                    Row(
+                        modifier = Modifier.fillMaxWidth(),
+                        horizontalArrangement = Arrangement.spacedBy(12.dp)
+                    ) {
+                        rowParams.forEach { param ->
+                            val history = histories[param] ?: emptyList()
+                            ChartCard(
+                                parameter = param,
+                                history = history,
+                                modifier = Modifier.weight(1f)
+                            )
+                        }
+                        // Fill remaining space if odd number
+                        if (rowParams.size == 1) {
+                            Spacer(modifier = Modifier.weight(1f))
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun ChartCard(
+    parameter: ChartParameter,
+    history: List<Float>,
+    modifier: Modifier = Modifier
+) {
+    Card(
+        modifier = modifier.height(180.dp),
+        colors = CardDefaults.cardColors(containerColor = Color(0xFF1E1E1E))
+    ) {
+        Column(modifier = Modifier.padding(12.dp)) {
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.SpaceBetween
+            ) {
+                Text(
+                    text = parameter.displayName,
+                    color = parameter.color,
+                    style = MaterialTheme.typography.bodyMedium
+                )
+                if (history.isNotEmpty()) {
+                    Text(
+                        text = String.format("%.1f", history.last()),
+                        color = parameter.color,
+                        style = MaterialTheme.typography.bodyMedium
+                    )
+                }
+            }
+            Spacer(modifier = Modifier.height(4.dp))
+            LineChart(
+                data = history,
+                maxValue = parameter.maxValue,
+                lineColor = parameter.color,
+                modifier = Modifier.fillMaxSize()
+            )
+        }
+    }
+}
+
+@Composable
+private fun LineChart(
+    data: List<Float>,
+    maxValue: Float,
+    lineColor: Color,
+    modifier: Modifier = Modifier
+) {
+    if (data.isEmpty()) {
+        Box(modifier = modifier, contentAlignment = Alignment.Center) {
+            Text(
+                text = "Waiting for data...",
+                color = Color.Gray,
+                style = MaterialTheme.typography.bodySmall
+            )
+        }
+        return
+    }
+
+    Canvas(modifier = modifier) {
+        val width = size.width
+        val height = size.height
+        val pointSpacing = if (data.size > 1) width / (data.size - 1) else 0f
+
+        val path = Path()
+        data.forEachIndexed { index, value ->
+            val x = index * pointSpacing
+            // Invert y since Canvas y=0 is at the top
+            val y = height - ((value / maxValue) * height).coerceIn(0f, height)
+            
+            if (index == 0) {
+                path.moveTo(x, y)
+            } else {
+                path.lineTo(x, y)
+            }
+        }
+
+        drawPath(
+            path = path,
+            color = lineColor,
+            style = Stroke(width = 3.dp.toPx())
+        )
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/ui/components/Gauges.kt b/app/src/main/java/com/example/esp32aldldashboard/ui/components/Gauges.kt
new file mode 100644
index 0000000..2a4f37e
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/ui/components/Gauges.kt
@@ -0,0 +1,125 @@
+package com.example.esp32aldldashboard.ui.components
+
+import androidx.compose.animation.core.Spring
+import androidx.compose.animation.core.animateFloatAsState
+import androidx.compose.animation.core.spring
+import androidx.compose.foundation.Canvas
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Size
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.StrokeCap
+import androidx.compose.ui.graphics.drawscope.Stroke
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+
+@Composable
+fun RpmGauge(
+    rpm: Int,
+    maxRpm: Int = 6000,
+    modifier: Modifier = Modifier
+) {
+    val animatedRpm by animateFloatAsState(
+        targetValue = rpm.toFloat(),
+        animationSpec = spring(dampingRatio = Spring.DampingRatioMediumBouncy, stiffness = Spring.StiffnessLow),
+        label = "rpmAnimation"
+    )
+
+    Box(modifier = modifier.aspectRatio(1f), contentAlignment = Alignment.Center) {
+        Canvas(modifier = Modifier.fillMaxSize().padding(16.dp)) {
+            val strokeWidth = 24.dp.toPx()
+            val startAngle = 135f
+            val sweepAngle = 270f
+            
+            // Background arc
+            drawArc(
+                color = Color.DarkGray.copy(alpha = 0.5f),
+                startAngle = startAngle,
+                sweepAngle = sweepAngle,
+                useCenter = false,
+                style = Stroke(width = strokeWidth, cap = StrokeCap.Round),
+                size = Size(size.width, size.height)
+            )
+
+            // Foreground arc
+            val progress = (animatedRpm / maxRpm).coerceIn(0f, 1f)
+            val color = if (progress > 0.85f) Color.Red else Color(0xFF00FFCC) // Neon Cyan
+            
+            drawArc(
+                color = color,
+                startAngle = startAngle,
+                sweepAngle = sweepAngle * progress,
+                useCenter = false,
+                style = Stroke(width = strokeWidth, cap = StrokeCap.Round),
+                size = Size(size.width, size.height)
+            )
+        }
+        
+        Text(
+            text = rpm.toString(),
+            color = Color.White,
+            fontSize = 32.sp,
+            fontWeight = FontWeight.Bold
+        )
+        Text(
+            text = "RPM",
+            color = Color.LightGray,
+            fontSize = 14.sp,
+            modifier = Modifier.align(Alignment.BottomCenter).padding(bottom = 24.dp)
+        )
+    }
+}
+
+@Composable
+fun TpsBar(
+    tpsVolts: Float,
+    modifier: Modifier = Modifier
+) {
+    val animatedTps by animateFloatAsState(
+        targetValue = tpsVolts,
+        animationSpec = spring(stiffness = Spring.StiffnessLow),
+        label = "tpsAnimation"
+    )
+
+    Box(modifier = modifier, contentAlignment = Alignment.Center) {
+        Canvas(modifier = Modifier.fillMaxSize()) {
+            val strokeWidth = size.height
+            val maxVolts = 5.0f
+            val progress = (animatedTps / maxVolts).coerceIn(0f, 1f)
+            
+            // Background bar
+            drawLine(
+                color = Color.DarkGray.copy(alpha = 0.5f),
+                start = Offset(0f, size.height / 2),
+                end = Offset(size.width, size.height / 2),
+                strokeWidth = strokeWidth,
+                cap = StrokeCap.Round
+            )
+
+            // Foreground bar
+            drawLine(
+                color = Color(0xFFFF9900), // Neon Orange
+                start = Offset(0f, size.height / 2),
+                end = Offset(size.width * progress, size.height / 2),
+                strokeWidth = strokeWidth,
+                cap = StrokeCap.Round
+            )
+        }
+        Text(
+            text = String.format("%.2f V", tpsVolts),
+            color = Color.White,
+            fontWeight = FontWeight.Bold,
+            fontSize = 14.sp
+        )
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/ui/main/DashboardScreen.kt b/app/src/main/java/com/example/esp32aldldashboard/ui/main/DashboardScreen.kt
new file mode 100644
index 0000000..0e5b91e
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/ui/main/DashboardScreen.kt
@@ -0,0 +1,511 @@
+package com.example.esp32aldldashboard.ui.main
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.*
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import com.example.esp32aldldashboard.bluetooth.ConnectionState
+import com.example.esp32aldldashboard.parser.ALDLFrame
+import com.example.esp32aldldashboard.parser.TroubleCodeDictionary
+import com.example.esp32aldldashboard.ui.components.RpmGauge
+import com.example.esp32aldldashboard.ui.components.TpsBar
+
+// Theme Colors
+val DarkBg = Color(0xFF0F0F12)
+val CardBg = Color(0xFF1B1B22)
+val BorderColor = Color(0xFF2E2E38)
+val NeonCyan = Color(0xFF00E5FF)
+val NeonRed = Color(0xFFFF3D00)
+val NeonGreen = Color(0xFF00E676)
+val NeonOrange = Color(0xFFFF9100)
+val TextWhite = Color(0xFFEEEEEE)
+val TextMuted = Color(0xFF9E9EAF)
+
+@Composable
+fun DashboardScreen(
+    connState: ConnectionState,
+    frame: ALDLFrame?,
+    isCelsius: Boolean,
+    onConnect: () -> Unit,
+    onDisconnect: () -> Unit,
+    onSimulate: () -> Unit,
+    modifier: Modifier = Modifier
+) {
+    Column(
+        modifier = modifier
+            .fillMaxSize()
+            .background(DarkBg)
+            .verticalScroll(rememberScrollState())
+    ) {
+        // App Title Banner
+        Text(
+            text = "PONTIAC FIERO ALDL DASHBOARD",
+            color = NeonOrange,
+            fontSize = 18.sp,
+            fontWeight = FontWeight.ExtraBold,
+            letterSpacing = 1.5.sp,
+            textAlign = TextAlign.Center,
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(vertical = 12.dp)
+        )
+
+        // Connection Action Card
+        ConnectionCard(
+            connState = connState,
+            errorMsg = "",
+            isCelsius = isCelsius,
+            onConnect = onConnect,
+            onDisconnect = onDisconnect,
+            onSimulate = onSimulate,
+            onToggleUnit = { /* Moved to settings */ }
+        )
+
+        Spacer(modifier = Modifier.height(12.dp))
+
+        // Telemetry Panels
+        if (frame != null) {
+            // Gauges row: RPM and TPS
+            Row(
+                modifier = Modifier.fillMaxWidth().padding(horizontal = 16.dp),
+                horizontalArrangement = Arrangement.spacedBy(12.dp)
+            ) {
+                RpmGauge(
+                    rpm = frame.engineSpeedRpm, 
+                    modifier = Modifier.weight(1f).aspectRatio(1f)
+                )
+                
+                Card(
+                    shape = RoundedCornerShape(12.dp),
+                    colors = CardDefaults.cardColors(containerColor = CardBg),
+                    modifier = Modifier.weight(1f).aspectRatio(1f)
+                        .border(1.dp, BorderColor, shape = RoundedCornerShape(12.dp))
+                ) {
+                    Column(modifier = Modifier.padding(16.dp), horizontalAlignment = Alignment.CenterHorizontally) {
+                        Text(text = "THROTTLE", color = TextMuted, fontSize = 12.sp, fontWeight = FontWeight.Bold)
+                        Spacer(modifier = Modifier.weight(1f))
+                        TpsBar(tpsVolts = frame.tpsVolts, modifier = Modifier.fillMaxWidth().height(40.dp))
+                        Spacer(modifier = Modifier.weight(1f))
+                    }
+                }
+            }
+
+            Spacer(modifier = Modifier.height(12.dp))
+
+            // Grid of Minor Telemetry Parameters
+            Column(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(horizontal = 16.dp),
+                verticalArrangement = Arrangement.spacedBy(12.dp)
+            ) {
+                // Coolant and Intake Temp Row
+                Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
+                    val coolantVal = if (isCelsius) frame.coolantTempC else frame.coolantTempF
+                    val coolantUnit = if (isCelsius) "°C" else "°F"
+                    val coolantProgress = (coolantVal + 40) / 290f // normalized range
+                    
+                    val matVal = if (isCelsius) frame.matC else frame.matF
+                    val matProgress = (matVal + 40) / 290f
+                    
+                    GridItemCard(
+                        title = "COOLANT TEMP",
+                        value = String.format("%.1f", coolantVal) + coolantUnit,
+                        progress = coolantProgress,
+                        progressColor = if (coolantVal > 210) NeonRed else NeonGreen,
+                        modifier = Modifier.weight(1f)
+                    )
+                    GridItemCard(
+                        title = "MAT (AIR TEMP)",
+                        value = String.format("%.1f", matVal) + coolantUnit,
+                        progress = matProgress,
+                        progressColor = NeonCyan,
+                        modifier = Modifier.weight(1f)
+                    )
+                }
+
+                // Fuel control row
+                Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
+                    GridItemCard(
+                        title = "BPW (INJECTOR)",
+                        value = String.format("%.3f ms", frame.bpwMs),
+                        progress = frame.bpwMs / 15f,
+                        progressColor = NeonCyan,
+                        modifier = Modifier.weight(1f)
+                    )
+                    GridItemCard(
+                        title = "O2 SENSOR",
+                        value = "${frame.o2SensorMv.toInt()} mV",
+                        progress = frame.o2SensorMv / 1000f,
+                        progressColor = if (frame.isRich) NeonGreen else NeonOrange,
+                        modifier = Modifier.weight(1f)
+                    )
+                }
+
+                // Air flow & Throttle Position
+                Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
+                    GridItemCard(
+                        title = "VEHICLE SPEED",
+                        value = "${frame.vehicleSpeedMPH} MPH",
+                        progress = frame.vehicleSpeedMPH / 120f,
+                        progressColor = NeonGreen,
+                        modifier = Modifier.weight(1f)
+                    )
+                    GridItemCard(
+                        title = "MAP (VACUUM)",
+                        value = String.format("%.1f kPa", frame.mapKpa),
+                        progress = frame.mapKpa / 105f,
+                        progressColor = NeonCyan,
+                        modifier = Modifier.weight(1f)
+                    )
+                }
+
+                // Fuel trims (BLM & INT) & Battery
+                Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
+                    GridItemCard(
+                        title = "BLM / INT",
+                        value = "${frame.blm} / ${frame.integrator}",
+                        progress = frame.blm / 256f,
+                        progressColor = if (frame.blm in 120..136) NeonGreen else NeonOrange,
+                        modifier = Modifier.weight(1f)
+                    )
+                    GridItemCard(
+                        title = "BATTERY VOLTS",
+                        value = String.format("%.1f V", frame.batteryVolts),
+                        progress = (frame.batteryVolts - 8) / 8f,
+                        progressColor = if (frame.batteryVolts < 12.0f) NeonRed else NeonGreen,
+                        modifier = Modifier.weight(1f)
+                    )
+                }
+
+                // IAC, Spark & EGR
+                Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
+                    GridItemCard(
+                        title = "IAC POSITION",
+                        value = "${frame.iacPosition} Steps",
+                        progress = frame.iacPosition / 160f,
+                        progressColor = NeonCyan,
+                        modifier = Modifier.weight(1f)
+                    )
+                    GridItemCard(
+                        title = "SPARK / EGR",
+                        value = String.format("%.1f° / %.0f%%", frame.sparkAdvance, frame.egrDutyCycle),
+                        progress = frame.egrDutyCycle / 100f,
+                        progressColor = NeonCyan,
+                        modifier = Modifier.weight(1f)
+                    )
+                }
+            }
+
+            Spacer(modifier = Modifier.height(16.dp))
+
+            // Status Badges Section
+            StatusFlagsPanel(frame = frame)
+
+            Spacer(modifier = Modifier.height(12.dp))
+
+            // Trouble Codes Card (at bottom - moved from top)
+            if (frame.activeFaultCodes.isNotEmpty()) {
+                TroubleCodesCard(activeCodes = frame.activeFaultCodes)
+                Spacer(modifier = Modifier.height(16.dp))
+            }
+        } else {
+            // Empty / Waiting display
+            Box(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .height(260.dp)
+                    .padding(horizontal = 16.dp)
+                    .background(CardBg, shape = RoundedCornerShape(12.dp))
+                    .border(1.dp, BorderColor, shape = RoundedCornerShape(12.dp)),
+                contentAlignment = Alignment.Center
+            ) {
+                Text(
+                    text = "Waiting for ALDL Stream data...\nSelect Connection or Simulation above.",
+                    color = TextMuted,
+                    fontSize = 14.sp,
+                    textAlign = TextAlign.Center
+                )
+            }
+            Spacer(modifier = Modifier.height(16.dp))
+        }
+
+        Spacer(modifier = Modifier.height(24.dp))
+    }
+}
+
+// ... Copying the UI components from MainScreen.kt to keep them in DashboardScreen.kt ...
+
+@Composable
+fun ConnectionCard(
+    connState: ConnectionState,
+    errorMsg: String,
+    isCelsius: Boolean,
+    onConnect: () -> Unit,
+    onDisconnect: () -> Unit,
+    onSimulate: () -> Unit,
+    onToggleUnit: () -> Unit
+) {
+    Card(
+        shape = RoundedCornerShape(12.dp),
+        colors = CardDefaults.cardColors(containerColor = CardBg),
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(horizontal = 16.dp)
+            .border(1.dp, BorderColor, shape = RoundedCornerShape(12.dp))
+    ) {
+        Column(
+            modifier = Modifier.padding(16.dp)
+        ) {
+            // Status bar
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.SpaceBetween,
+                verticalAlignment = Alignment.CenterVertically
+            ) {
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Text(
+                        text = "STATUS: ",
+                        color = TextMuted,
+                        fontWeight = FontWeight.Bold,
+                        fontSize = 13.sp
+                    )
+                    val (statusText, statusColor) = when (connState) {
+                        ConnectionState.DISCONNECTED -> "DISCONNECTED" to TextMuted
+                        ConnectionState.CONNECTING -> "CONNECTING..." to NeonOrange
+                        ConnectionState.CONNECTED -> "CONNECTED" to NeonGreen
+                        ConnectionState.ERROR -> "ERROR" to NeonRed
+                    }
+                    Text(
+                        text = statusText,
+                        color = statusColor,
+                        fontWeight = FontWeight.Bold,
+                        fontSize = 13.sp
+                    )
+                }
+            }
+
+            if (errorMsg.isNotEmpty()) {
+                Spacer(modifier = Modifier.height(8.dp))
+                Text(
+                    text = errorMsg,
+                    color = NeonRed,
+                    fontSize = 12.sp,
+                    fontWeight = FontWeight.Medium
+                )
+            }
+
+            Spacer(modifier = Modifier.height(14.dp))
+
+            // Action Buttons
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.spacedBy(8.dp)
+            ) {
+                if (connState != ConnectionState.CONNECTED && connState != ConnectionState.CONNECTING) {
+                    Button(
+                        onClick = onConnect,
+                        colors = ButtonDefaults.buttonColors(containerColor = NeonOrange),
+                        modifier = Modifier.weight(1f),
+                        shape = RoundedCornerShape(8.dp)
+                    ) {
+                        Text("CONNECT BT", fontWeight = FontWeight.Bold)
+                    }
+                } else {
+                    Button(
+                        onClick = onDisconnect,
+                        colors = ButtonDefaults.buttonColors(containerColor = BorderColor),
+                        modifier = Modifier.weight(1f),
+                        shape = RoundedCornerShape(8.dp)
+                    ) {
+                        Text("DISCONNECT", fontWeight = FontWeight.Bold, color = TextWhite)
+                    }
+                }
+
+                Button(
+                    onClick = onSimulate,
+                    colors = ButtonDefaults.buttonColors(containerColor = BorderColor),
+                    modifier = Modifier.weight(1f),
+                    shape = RoundedCornerShape(8.dp)
+                ) {
+                    Text("SIMULATE", fontWeight = FontWeight.Bold, color = NeonCyan)
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun GridItemCard(
+    title: String,
+    value: String,
+    progress: Float,
+    progressColor: Color,
+    modifier: Modifier = Modifier
+) {
+    Card(
+        shape = RoundedCornerShape(10.dp),
+        colors = CardDefaults.cardColors(containerColor = CardBg),
+        modifier = modifier
+            .border(1.dp, BorderColor, shape = RoundedCornerShape(10.dp))
+    ) {
+        Column(
+            modifier = Modifier.padding(10.dp)
+        ) {
+            Text(
+                text = title,
+                color = TextMuted,
+                fontSize = 10.sp,
+                fontWeight = FontWeight.Bold
+            )
+            Spacer(modifier = Modifier.height(2.dp))
+            Text(
+                text = value,
+                color = TextWhite,
+                fontSize = 18.sp,
+                fontWeight = FontWeight.ExtraBold
+            )
+            Spacer(modifier = Modifier.height(6.dp))
+            LinearProgressIndicator(
+                progress = { progress.coerceIn(0f, 1f) },
+                color = progressColor,
+                trackColor = BorderColor,
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .height(4.dp)
+            )
+        }
+    }
+}
+
+@Composable
+fun TroubleCodesCard(activeCodes: List<Int>) {
+    Card(
+        shape = RoundedCornerShape(12.dp),
+        colors = CardDefaults.cardColors(containerColor = CardBg),
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(horizontal = 16.dp)
+            .border(1.dp, NeonRed, shape = RoundedCornerShape(12.dp))
+    ) {
+        Column(
+            modifier = Modifier.padding(16.dp)
+        ) {
+            Row(
+                verticalAlignment = Alignment.CenterVertically
+            ) {
+                Text(
+                    text = "⚠️ ACTIVE ECM FAULT CODES",
+                    color = NeonRed,
+                    fontWeight = FontWeight.Black,
+                    fontSize = 14.sp
+                )
+            }
+            Spacer(modifier = Modifier.height(8.dp))
+            Column(
+                verticalArrangement = Arrangement.spacedBy(8.dp)
+            ) {
+                activeCodes.forEach { code ->
+                    Row(verticalAlignment = Alignment.CenterVertically) {
+                        Box(
+                            modifier = Modifier
+                                .background(NeonRed, shape = RoundedCornerShape(4.dp))
+                                .padding(horizontal = 10.dp, vertical = 4.dp)
+                        ) {
+                            Text(
+                                text = "CODE $code",
+                                color = Color.White,
+                                fontWeight = FontWeight.Bold,
+                                fontSize = 12.sp
+                            )
+                        }
+                        Spacer(modifier = Modifier.width(8.dp))
+                        Text(
+                            text = TroubleCodeDictionary.getDescription(code),
+                            color = TextWhite,
+                            fontSize = 12.sp
+                        )
+                    }
+                }
+            }
+        }
+    }
+}
+
+@OptIn(ExperimentalLayoutApi::class)
+@Composable
+fun StatusFlagsPanel(frame: ALDLFrame) {
+    Card(
+        shape = RoundedCornerShape(12.dp),
+        colors = CardDefaults.cardColors(containerColor = CardBg),
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(horizontal = 16.dp)
+            .border(1.dp, BorderColor, shape = RoundedCornerShape(12.dp))
+    ) {
+        Column(
+            modifier = Modifier.padding(14.dp)
+        ) {
+            Text(
+                text = "LOOP STATUS & SYSTEM SWITCHES",
+                color = TextMuted,
+                fontSize = 12.sp,
+                fontWeight = FontWeight.Bold
+            )
+            Spacer(modifier = Modifier.height(10.dp))
+            
+            FlowRow(
+                horizontalArrangement = Arrangement.spacedBy(6.dp),
+                verticalArrangement = Arrangement.spacedBy(6.dp),
+                modifier = Modifier.fillMaxWidth()
+            ) {
+                StatusBadge(label = "Closed Loop", active = frame.isClosedLoop, activeColor = NeonGreen)
+                StatusBadge(label = "Rich Mixture", active = frame.isRich, activeColor = NeonGreen)
+                StatusBadge(label = "BLM Enabled", active = frame.blmEnable, activeColor = NeonGreen)
+                StatusBadge(label = "TCC Locked", active = frame.isTccLocked, activeColor = NeonGreen)
+                StatusBadge(label = "AC Clutch", active = frame.isAcClutchEnabled, activeColor = NeonGreen)
+                StatusBadge(label = "Park/Neutral", active = frame.isParkNeutral, activeColor = NeonCyan)
+                StatusBadge(label = "A/C Request", active = frame.isAcEnabled, activeColor = NeonCyan)
+                StatusBadge(label = "PS Cramp", active = frame.isPowerSteeringCrampActive, activeColor = NeonOrange)
+                StatusBadge(label = "Async Pulse", active = frame.asyncPulse, activeColor = NeonOrange)
+                StatusBadge(label = "Quasi Pulse", active = frame.quasiPulse, activeColor = NeonOrange)
+            }
+        }
+    }
+}
+
+@Composable
+fun StatusBadge(label: String, active: Boolean, activeColor: Color) {
+    Box(
+        modifier = Modifier
+            .background(
+                color = if (active) activeColor.copy(alpha = 0.15f) else Color.Transparent,
+                shape = RoundedCornerShape(4.dp)
+            )
+            .border(
+                width = 1.dp,
+                color = if (active) activeColor else BorderColor,
+                shape = RoundedCornerShape(4.dp)
+            )
+            .padding(horizontal = 8.dp, vertical = 4.dp)
+    ) {
+        Text(
+            text = label,
+            color = if (active) activeColor else TextMuted,
+            fontSize = 11.sp,
+            fontWeight = FontWeight.Bold
+        )
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/ui/main/MainScreen.kt b/app/src/main/java/com/example/esp32aldldashboard/ui/main/MainScreen.kt
index 7e68f17..990dcd6 100644
--- a/app/src/main/java/com/example/esp32aldldashboard/ui/main/MainScreen.kt
+++ b/app/src/main/java/com/example/esp32aldldashboard/ui/main/MainScreen.kt
@@ -5,54 +5,42 @@ import android.content.pm.PackageManager
 import android.widget.Toast
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
-import androidx.compose.foundation.background
-import androidx.compose.foundation.border
-import androidx.compose.foundation.layout.*
-import androidx.compose.foundation.rememberScrollState
-import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.foundation.verticalScroll
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Info
+import androidx.compose.material.icons.filled.Settings
+import androidx.compose.material.icons.filled.ShowChart
+import androidx.compose.material.icons.filled.TableChart
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
-import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.Brush
-import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.text.font.FontFamily
-import androidx.compose.ui.text.font.FontWeight
-import androidx.compose.ui.text.style.TextAlign
-import androidx.compose.ui.unit.dp
-import androidx.compose.ui.unit.sp
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.lifecycle.viewmodel.compose.viewModel
-import androidx.navigation3.runtime.NavKey
-import com.example.esp32aldldashboard.bluetooth.ConnectionState
-import com.example.esp32aldldashboard.parser.ALDLFrame
-
-// Theme Colors
-private val DarkBg = Color(0xFF0F0F12)
-private val CardBg = Color(0xFF1B1B22)
-private val BorderColor = Color(0xFF2E2E38)
-private val NeonCyan = Color(0xFF00E5FF)
-private val NeonRed = Color(0xFFFF3D00)
-private val NeonGreen = Color(0xFF00E676)
-private val NeonOrange = Color(0xFFFF9100)
-private val TextWhite = Color(0xFFEEEEEE)
-private val TextMuted = Color(0xFF9E9EAF)
+import com.example.esp32aldldashboard.AldlApplication
+import com.example.esp32aldldashboard.ui.blm.BLMTableScreen
+import com.example.esp32aldldashboard.ui.blm.BLMTableViewModelFactory
+import com.example.esp32aldldashboard.ui.charts.ChartsScreen
+import com.example.esp32aldldashboard.ui.settings.SettingsScreen
 
 @Composable
 fun MainScreen(
-    onItemClick: (NavKey) -> Unit,
     modifier: Modifier = Modifier,
 ) {
     val context = LocalContext.current
-    val viewModel: MainScreenViewModel = viewModel { MainScreenViewModel(context) }
+    val app = context.applicationContext as AldlApplication
+    
+    val viewModel: MainScreenViewModel = viewModel(
+        factory = MainScreenViewModelFactory(
+            telemetryRepository = app.telemetryRepository,
+            settingsRepository = app.settingsRepository
+        )
+    )
     
     val connState by viewModel.connectionState.collectAsStateWithLifecycle()
     val frame by viewModel.latestFrame.collectAsStateWithLifecycle()
     val rawLog by viewModel.rawHexLog.collectAsStateWithLifecycle()
-    val errorMsg by viewModel.errorMessage.collectAsStateWithLifecycle()
     val isCelsius by viewModel.isCelsius.collectAsStateWithLifecycle()
 
     val permissionsLauncher = rememberLauncherForActivityResult(
@@ -70,7 +58,8 @@ fun MainScreen(
         val requiredPermissions = if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.S) {
             arrayOf(
                 Manifest.permission.BLUETOOTH_SCAN,
-                Manifest.permission.BLUETOOTH_CONNECT
+                Manifest.permission.BLUETOOTH_CONNECT,
+                Manifest.permission.POST_NOTIFICATIONS
             )
         } else {
             arrayOf(
@@ -90,623 +79,70 @@ fun MainScreen(
         }
     }
 
-    MainScreenContent(
-        connState = connState,
-        frame = frame,
-        rawLog = rawLog,
-        errorMsg = errorMsg,
-        isCelsius = isCelsius,
-        onConnect = onConnectClick,
-        onDisconnect = { viewModel.disconnect() },
-        onSimulate = { viewModel.startSimulation() },
-        onToggleUnit = { viewModel.toggleTemperatureUnit() },
-        modifier = modifier
-    )
-}
+    var selectedTab by remember { mutableStateOf(0) }
 
-@Composable
-fun MainScreenContent(
-    connState: ConnectionState,
-    frame: ALDLFrame?,
-    rawLog: List<String>,
-    errorMsg: String,
-    isCelsius: Boolean,
-    onConnect: () -> Unit,
-    onDisconnect: () -> Unit,
-    onSimulate: () -> Unit,
-    onToggleUnit: () -> Unit,
-    modifier: Modifier = Modifier
-) {
-    Column(
-        modifier = modifier
-            .fillMaxSize()
-            .background(DarkBg)
-            .verticalScroll(rememberScrollState())
-    ) {
-        // App Title Banner
-        Text(
-            text = "PONTIAC FIERO ALDL DASHBOARD",
-            color = NeonOrange,
-            fontSize = 18.sp,
-            fontWeight = FontWeight.ExtraBold,
-            letterSpacing = 1.5.sp,
-            textAlign = TextAlign.Center,
-            modifier = Modifier
-                .fillMaxWidth()
-                .padding(vertical = 12.dp)
-        )
-
-        // Connection Action Card
-        ConnectionCard(
-            connState = connState,
-            errorMsg = errorMsg,
-            isCelsius = isCelsius,
-            onConnect = onConnect,
-            onDisconnect = onDisconnect,
-            onSimulate = onSimulate,
-            onToggleUnit = onToggleUnit
-        )
-
-        Spacer(modifier = Modifier.height(12.dp))
-
-        // Telemetry Panels
-        if (frame != null) {
-            // Trouble Codes Card (Flashing if active)
-            if (frame.activeFaultCodes.isNotEmpty()) {
-                TroubleCodesCard(activeCodes = frame.activeFaultCodes)
-                Spacer(modifier = Modifier.height(12.dp))
-            }
-
-            // Key Metrics
-            Row(
-                modifier = Modifier
-                    .fillMaxWidth()
-                    .padding(horizontal = 16.dp),
-                horizontalArrangement = Arrangement.spacedBy(12.dp)
-            ) {
-                MetricCard(
-                    title = "ENGINE SPEED",
-                    value = "${frame.engineSpeedRpm}",
-                    unit = "RPM",
-                    progress = frame.engineSpeedRpm / 6000f,
-                    progressColor = NeonCyan,
-                    modifier = Modifier.weight(1f)
+    Scaffold(
+        bottomBar = {
+            NavigationBar(containerColor = DarkBg, contentColor = NeonOrange) {
+                NavigationBarItem(
+                    icon = { Icon(Icons.Default.Info, contentDescription = "Dashboard") },
+                    label = { Text("Dashboard") },
+                    selected = selectedTab == 0,
+                    onClick = { selectedTab = 0 },
+                    colors = NavigationBarItemDefaults.colors(selectedIconColor = NeonCyan, unselectedIconColor = TextMuted)
                 )
-                MetricCard(
-                    title = "VEHICLE SPEED",
-                    value = "${frame.vehicleSpeedMPH}",
-                    unit = "MPH",
-                    progress = frame.vehicleSpeedMPH / 120f,
-                    progressColor = NeonGreen,
-                    modifier = Modifier.weight(1f)
+                NavigationBarItem(
+                    icon = { Icon(Icons.Default.ShowChart, contentDescription = "Charts") },
+                    label = { Text("Charts") },
+                    selected = selectedTab == 1,
+                    onClick = { selectedTab = 1 },
+                    colors = NavigationBarItemDefaults.colors(selectedIconColor = NeonCyan, unselectedIconColor = TextMuted)
                 )
-            }
-
-            Spacer(modifier = Modifier.height(12.dp))
-
-            // Grid of Minor Telemetry Parameters
-            Column(
-                modifier = Modifier
-                    .fillMaxWidth()
-                    .padding(horizontal = 16.dp),
-                verticalArrangement = Arrangement.spacedBy(12.dp)
-            ) {
-                // Coolant and Intake Temp Row
-                Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
-                    val coolantVal = if (isCelsius) frame.coolantTempC else frame.coolantTempF
-                    val coolantUnit = if (isCelsius) "°C" else "°F"
-                    val coolantProgress = (coolantVal + 40) / 290f // normalized range
-                    
-                    val matVal = if (isCelsius) frame.matC else frame.matF
-                    val matProgress = (matVal + 40) / 290f
-                    
-                    GridItemCard(
-                        title = "COOLANT TEMP",
-                        value = String.format("%.1f", coolantVal) + coolantUnit,
-                        progress = coolantProgress,
-                        progressColor = if (coolantVal > 210) NeonRed else NeonGreen,
-                        modifier = Modifier.weight(1f)
-                    )
-                    GridItemCard(
-                        title = "MAT (AIR TEMP)",
-                        value = String.format("%.1f", matVal) + coolantUnit,
-                        progress = matProgress,
-                        progressColor = NeonCyan,
-                        modifier = Modifier.weight(1f)
-                    )
-                }
-
-                // Fuel control row
-                Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
-                    GridItemCard(
-                        title = "BPW (INJECTOR)",
-                        value = String.format("%.3f ms", frame.bpwMs),
-                        progress = frame.bpwMs / 15f,
-                        progressColor = NeonCyan,
-                        modifier = Modifier.weight(1f)
-                    )
-                    GridItemCard(
-                        title = "O2 SENSOR",
-                        value = "${frame.o2SensorMv.toInt()} mV",
-                        progress = frame.o2SensorMv / 1000f,
-                        progressColor = if (frame.isRich) NeonGreen else NeonOrange,
-                        modifier = Modifier.weight(1f)
-                    )
-                }
-
-                // Air flow & Throttle Position
-                Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
-                    GridItemCard(
-                        title = "TPS (THROTTLE)",
-                        value = String.format("%.2f V", frame.tpsVolts),
-                        progress = frame.tpsVolts / 5.0f,
-                        progressColor = NeonGreen,
-                        modifier = Modifier.weight(1f)
-                    )
-                    GridItemCard(
-                        title = "MAP (VACUUM)",
-                        value = String.format("%.1f kPa", frame.mapKpa),
-                        progress = frame.mapKpa / 105f,
-                        progressColor = NeonCyan,
-                        modifier = Modifier.weight(1f)
-                    )
-                }
-
-                // Fuel trims (BLM & INT) & Battery
-                Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
-                    GridItemCard(
-                        title = "BLM / INT",
-                        value = "${frame.blm} / ${frame.integrator}",
-                        progress = frame.blm / 256f,
-                        progressColor = if (frame.blm in 120..136) NeonGreen else NeonOrange,
-                        modifier = Modifier.weight(1f)
-                    )
-                    GridItemCard(
-                        title = "BATTERY VOLTS",
-                        value = String.format("%.1f V", frame.batteryVolts),
-                        progress = (frame.batteryVolts - 8) / 8f,
-                        progressColor = if (frame.batteryVolts < 12.0f) NeonRed else NeonGreen,
-                        modifier = Modifier.weight(1f)
-                    )
-                }
-
-                // IAC, Spark & EGR
-                Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
-                    GridItemCard(
-                        title = "IAC POSITION",
-                        value = "${frame.iacPosition} Steps",
-                        progress = frame.iacPosition / 160f,
-                        progressColor = NeonCyan,
-                        modifier = Modifier.weight(1f)
-                    )
-                    GridItemCard(
-                        title = "SPARK / EGR",
-                        value = String.format("%.1f° / %.0f%%", frame.sparkAdvance, frame.egrDutyCycle),
-                        progress = frame.egrDutyCycle / 100f,
-                        progressColor = NeonCyan,
-                        modifier = Modifier.weight(1f)
-                    )
-                }
-            }
-
-            Spacer(modifier = Modifier.height(16.dp))
-
-            // Status Badges Section
-            StatusFlagsPanel(frame = frame)
-
-            Spacer(modifier = Modifier.height(16.dp))
-        } else {
-            // Empty / Waiting display
-            Box(
-                modifier = Modifier
-                    .fillMaxWidth()
-                    .height(260.dp)
-                    .padding(horizontal = 16.dp)
-                    .background(CardBg, shape = RoundedCornerShape(12.dp))
-                    .border(1.dp, BorderColor, shape = RoundedCornerShape(12.dp)),
-                contentAlignment = Alignment.Center
-            ) {
-                Text(
-                    text = "Waiting for ALDL Stream data...\nSelect Connection or Simulation above.",
-                    color = TextMuted,
-                    fontSize = 14.sp,
-                    textAlign = TextAlign.Center
+                NavigationBarItem(
+                    icon = { Icon(Icons.Default.TableChart, contentDescription = "BLM Table") },
+                    label = { Text("BLM") },
+                    selected = selectedTab == 2,
+                    onClick = { selectedTab = 2 },
+                    colors = NavigationBarItemDefaults.colors(selectedIconColor = NeonCyan, unselectedIconColor = TextMuted)
                 )
-            }
-            Spacer(modifier = Modifier.height(16.dp))
-        }
-
-        // Live Diagnostic Console log
-        DiagnosticConsole(rawLog = rawLog)
-        
-        Spacer(modifier = Modifier.height(24.dp))
-    }
-}
-
-@Composable
-fun ConnectionCard(
-    connState: ConnectionState,
-    errorMsg: String,
-    isCelsius: Boolean,
-    onConnect: () -> Unit,
-    onDisconnect: () -> Unit,
-    onSimulate: () -> Unit,
-    onToggleUnit: () -> Unit
-) {
-    Card(
-        shape = RoundedCornerShape(12.dp),
-        colors = CardDefaults.cardColors(containerColor = CardBg),
-        modifier = Modifier
-            .fillMaxWidth()
-            .padding(horizontal = 16.dp)
-            .border(1.dp, BorderColor, shape = RoundedCornerShape(12.dp))
-    ) {
-        Column(
-            modifier = Modifier.padding(16.dp)
-        ) {
-            // Status bar
-            Row(
-                modifier = Modifier.fillMaxWidth(),
-                horizontalArrangement = Arrangement.SpaceBetween,
-                verticalAlignment = Alignment.CenterVertically
-            ) {
-                Row(verticalAlignment = Alignment.CenterVertically) {
-                    Text(
-                        text = "STATUS: ",
-                        color = TextMuted,
-                        fontWeight = FontWeight.Bold,
-                        fontSize = 13.sp
-                    )
-                    val (statusText, statusColor) = when (connState) {
-                        ConnectionState.DISCONNECTED -> "DISCONNECTED" to TextMuted
-                        ConnectionState.CONNECTING -> "CONNECTING..." to NeonOrange
-                        ConnectionState.CONNECTED -> "CONNECTED" to NeonGreen
-                        ConnectionState.ERROR -> "ERROR" to NeonRed
-                    }
-                    Text(
-                        text = statusText,
-                        color = statusColor,
-                        fontWeight = FontWeight.Bold,
-                        fontSize = 13.sp
-                    )
-                }
-
-                // Temperature Toggle Button
-                Button(
-                    onClick = onToggleUnit,
-                    colors = ButtonDefaults.buttonColors(containerColor = BorderColor),
-                    contentPadding = PaddingValues(horizontal = 12.dp, vertical = 4.dp),
-                    shape = RoundedCornerShape(6.dp),
-                    modifier = Modifier.height(28.dp)
-                ) {
-                    Text(
-                        text = if (isCelsius) "USE °F" else "USE °C",
-                        color = TextWhite,
-                        fontSize = 11.sp,
-                        fontWeight = FontWeight.Bold
-                    )
-                }
-            }
-
-            if (errorMsg.isNotEmpty()) {
-                Spacer(modifier = Modifier.height(8.dp))
-                Text(
-                    text = errorMsg,
-                    color = NeonRed,
-                    fontSize = 12.sp,
-                    fontWeight = FontWeight.Medium
+                NavigationBarItem(
+                    icon = { Icon(Icons.Default.Settings, contentDescription = "Settings") },
+                    label = { Text("Settings") },
+                    selected = selectedTab == 3,
+                    onClick = { selectedTab = 3 },
+                    colors = NavigationBarItemDefaults.colors(selectedIconColor = NeonCyan, unselectedIconColor = TextMuted)
                 )
             }
-
-            Spacer(modifier = Modifier.height(14.dp))
-
-            // Action Buttons
-            Row(
-                modifier = Modifier.fillMaxWidth(),
-                horizontalArrangement = Arrangement.spacedBy(8.dp)
-            ) {
-                if (connState != ConnectionState.CONNECTED && connState != ConnectionState.CONNECTING) {
-                    Button(
-                        onClick = onConnect,
-                        colors = ButtonDefaults.buttonColors(containerColor = NeonOrange),
-                        modifier = Modifier.weight(1f),
-                        shape = RoundedCornerShape(8.dp)
-                    ) {
-                        Text("CONNECT BT", fontWeight = FontWeight.Bold)
-                    }
-                } else {
-                    Button(
-                        onClick = onDisconnect,
-                        colors = ButtonDefaults.buttonColors(containerColor = BorderColor),
-                        modifier = Modifier.weight(1f),
-                        shape = RoundedCornerShape(8.dp)
-                    ) {
-                        Text("DISCONNECT", fontWeight = FontWeight.Bold, color = TextWhite)
-                    }
-                }
-
-                Button(
-                    onClick = onSimulate,
-                    colors = ButtonDefaults.buttonColors(containerColor = BorderColor),
-                    modifier = Modifier.weight(1f),
-                    shape = RoundedCornerShape(8.dp)
-                ) {
-                    Text("SIMULATE", fontWeight = FontWeight.Bold, color = NeonCyan)
-                }
-            }
         }
-    }
-}
-
-@Composable
-fun MetricCard(
-    title: String,
-    value: String,
-    unit: String,
-    progress: Float,
-    progressColor: Color,
-    modifier: Modifier = Modifier
-) {
-    Card(
-        shape = RoundedCornerShape(12.dp),
-        colors = CardDefaults.cardColors(containerColor = CardBg),
-        modifier = modifier
-            .border(1.dp, BorderColor, shape = RoundedCornerShape(12.dp))
-    ) {
-        Column(
-            modifier = Modifier.padding(14.dp),
-            horizontalAlignment = Alignment.CenterHorizontally
-        ) {
-            Text(
-                text = title,
-                color = TextMuted,
-                fontSize = 11.sp,
-                fontWeight = FontWeight.Bold
+    ) { paddingValues ->
+        when (selectedTab) {
+            0 -> DashboardScreen(
+                connState = connState,
+                frame = frame,
+                isCelsius = isCelsius,
+                onConnect = onConnectClick,
+                onDisconnect = { viewModel.disconnect() },
+                onSimulate = { viewModel.startSimulation() },
+                modifier = modifier.padding(paddingValues)
             )
-            Spacer(modifier = Modifier.height(4.dp))
-            Row(
-                verticalAlignment = Alignment.Bottom
-            ) {
-                Text(
-                    text = value,
-                    color = TextWhite,
-                    fontSize = 28.sp,
-                    fontWeight = FontWeight.Black
+            1 -> ChartsScreen(
+                latestFrameFlow = viewModel.latestFrame,
+                chartPreferencesRepository = app.chartPreferencesRepository,
+                modifier = modifier.padding(paddingValues)
+            )
+            2 -> {
+                val blmViewModel: com.example.esp32aldldashboard.ui.blm.BLMTableViewModel = viewModel(
+                    factory = BLMTableViewModelFactory(app.blmTableRepository)
                 )
-                Spacer(modifier = Modifier.width(4.dp))
-                Text(
-                    text = unit,
-                    color = TextMuted,
-                    fontSize = 12.sp,
-                    fontWeight = FontWeight.Bold,
-                    modifier = Modifier.padding(bottom = 4.dp)
+                BLMTableScreen(
+                    viewModel = blmViewModel,
+                    modifier = modifier.padding(paddingValues)
                 )
             }
-            Spacer(modifier = Modifier.height(8.dp))
-            LinearProgressIndicator(
-                progress = progress.coerceIn(0f, 1f),
-                color = progressColor,
-                trackColor = BorderColor,
-                modifier = Modifier
-                    .fillMaxWidth()
-                    .height(6.dp)
+            3 -> SettingsScreen(
+                settingsRepository = app.settingsRepository,
+                modifier = modifier.padding(paddingValues)
             )
         }
     }
 }
-
-@Composable
-fun GridItemCard(
-    title: String,
-    value: String,
-    progress: Float,
-    progressColor: Color,
-    modifier: Modifier = Modifier
-) {
-    Card(
-        shape = RoundedCornerShape(10.dp),
-        colors = CardDefaults.cardColors(containerColor = CardBg),
-        modifier = modifier
-            .border(1.dp, BorderColor, shape = RoundedCornerShape(10.dp))
-    ) {
-        Column(
-            modifier = Modifier.padding(10.dp)
-        ) {
-            Text(
-                text = title,
-                color = TextMuted,
-                fontSize = 10.sp,
-                fontWeight = FontWeight.Bold
-            )
-            Spacer(modifier = Modifier.height(2.dp))
-            Text(
-                text = value,
-                color = TextWhite,
-                fontSize = 18.sp,
-                fontWeight = FontWeight.ExtraBold
-            )
-            Spacer(modifier = Modifier.height(6.dp))
-            LinearProgressIndicator(
-                progress = progress.coerceIn(0f, 1f),
-                color = progressColor,
-                trackColor = BorderColor,
-                modifier = Modifier
-                    .fillMaxWidth()
-                    .height(4.dp)
-            )
-        }
-    }
-}
-
-@Composable
-fun TroubleCodesCard(activeCodes: List<Int>) {
-    Card(
-        shape = RoundedCornerShape(12.dp),
-        colors = CardDefaults.cardColors(containerColor = CardBg),
-        modifier = Modifier
-            .fillMaxWidth()
-            .padding(horizontal = 16.dp)
-            .border(1.dp, NeonRed, shape = RoundedCornerShape(12.dp))
-    ) {
-        Column(
-            modifier = Modifier.padding(16.dp)
-        ) {
-            Row(
-                verticalAlignment = Alignment.CenterVertically
-            ) {
-                Text(
-                    text = "⚠️ ACTIVE ECM FAULT CODES",
-                    color = NeonRed,
-                    fontWeight = FontWeight.Black,
-                    fontSize = 14.sp
-                )
-            }
-            Spacer(modifier = Modifier.height(8.dp))
-            Row(
-                horizontalArrangement = Arrangement.spacedBy(8.dp)
-            ) {
-                activeCodes.forEach { code ->
-                    Box(
-                        modifier = Modifier
-                            .background(NeonRed, shape = RoundedCornerShape(4.dp))
-                            .padding(horizontal = 10.dp, vertical = 4.dp)
-                    ) {
-                        Text(
-                            text = "CODE $code",
-                            color = Color.White,
-                            fontWeight = FontWeight.Bold,
-                            fontSize = 12.sp
-                        )
-                    }
-                }
-            }
-            Spacer(modifier = Modifier.height(8.dp))
-            Text(
-                text = "Refer to Fiero shop manual for diagnosis.",
-                color = TextMuted,
-                fontSize = 11.sp
-            )
-        }
-    }
-}
-
-@OptIn(ExperimentalLayoutApi::class)
-@Composable
-fun StatusFlagsPanel(frame: ALDLFrame) {
-    Card(
-        shape = RoundedCornerShape(12.dp),
-        colors = CardDefaults.cardColors(containerColor = CardBg),
-        modifier = Modifier
-            .fillMaxWidth()
-            .padding(horizontal = 16.dp)
-            .border(1.dp, BorderColor, shape = RoundedCornerShape(12.dp))
-    ) {
-        Column(
-            modifier = Modifier.padding(14.dp)
-        ) {
-            Text(
-                text = "LOOP STATUS & SYSTEM SWITCHES",
-                color = TextMuted,
-                fontSize = 12.sp,
-                fontWeight = FontWeight.Bold
-            )
-            Spacer(modifier = Modifier.height(10.dp))
-            
-            FlowRow(
-                horizontalArrangement = Arrangement.spacedBy(6.dp),
-                verticalArrangement = Arrangement.spacedBy(6.dp),
-                modifier = Modifier.fillMaxWidth()
-            ) {
-                StatusBadge(label = "Closed Loop", active = frame.isClosedLoop, activeColor = NeonGreen)
-                StatusBadge(label = "Rich Mixture", active = frame.isRich, activeColor = NeonGreen)
-                StatusBadge(label = "BLM Enabled", active = frame.blmEnable, activeColor = NeonGreen)
-                StatusBadge(label = "TCC Locked", active = frame.isTccLocked, activeColor = NeonGreen)
-                StatusBadge(label = "AC Clutch", active = frame.isAcClutchEnabled, activeColor = NeonGreen)
-                StatusBadge(label = "Park/Neutral", active = frame.isParkNeutral, activeColor = NeonCyan)
-                StatusBadge(label = "A/C Request", active = frame.isAcEnabled, activeColor = NeonCyan)
-                StatusBadge(label = "PS Cramp", active = frame.isPowerSteeringCrampActive, activeColor = NeonOrange)
-                StatusBadge(label = "Async Pulse", active = frame.asyncPulse, activeColor = NeonOrange)
-                StatusBadge(label = "Quasi Pulse", active = frame.quasiPulse, activeColor = NeonOrange)
-            }
-        }
-    }
-}
-
-@Composable
-fun StatusBadge(label: String, active: Boolean, activeColor: Color) {
-    Box(
-        modifier = Modifier
-            .background(
-                color = if (active) activeColor.copy(alpha = 0.15f) else Color.Transparent,
-                shape = RoundedCornerShape(4.dp)
-            )
-            .border(
-                width = 1.dp,
-                color = if (active) activeColor else BorderColor,
-                shape = RoundedCornerShape(4.dp)
-            )
-            .padding(horizontal = 8.dp, vertical = 4.dp)
-    ) {
-        Text(
-            text = label,
-            color = if (active) activeColor else TextMuted,
-            fontSize = 11.sp,
-            fontWeight = FontWeight.Bold
-        )
-    }
-}
-
-@Composable
-fun DiagnosticConsole(rawLog: List<String>) {
-    Card(
-        shape = RoundedCornerShape(12.dp),
-        colors = CardDefaults.cardColors(containerColor = CardBg),
-        modifier = Modifier
-            .fillMaxWidth()
-            .padding(horizontal = 16.dp)
-            .border(1.dp, BorderColor, shape = RoundedCornerShape(12.dp))
-    ) {
-        Column(
-            modifier = Modifier.padding(14.dp)
-        ) {
-            Text(
-                text = "DIAGNOSTIC TELEMETRY STREAM LOG",
-                color = TextMuted,
-                fontSize = 11.sp,
-                fontWeight = FontWeight.Bold
-            )
-            Spacer(modifier = Modifier.height(8.dp))
-            Box(
-                modifier = Modifier
-                    .fillMaxWidth()
-                    .height(100.dp)
-                    .background(Color.Black, shape = RoundedCornerShape(6.dp))
-                    .padding(8.dp)
-            ) {
-                Column(
-                    modifier = Modifier
-                        .fillMaxSize()
-                        .verticalScroll(rememberScrollState())
-                ) {
-                    if (rawLog.isEmpty()) {
-                        Text(
-                            text = "Console Idle. Connect to view hex dump...",
-                            color = TextMuted,
-                            fontFamily = FontFamily.Monospace,
-                            fontSize = 10.sp
-                        )
-                    } else {
-                        rawLog.forEach { logLine ->
-                            Text(
-                                text = logLine,
-                                color = NeonGreen,
-                                fontFamily = FontFamily.Monospace,
-                                fontSize = 10.sp
-                            )
-                        }
-                    }
-                }
-            }
-        }
-    }
-}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/ui/main/MainScreenViewModel.kt b/app/src/main/java/com/example/esp32aldldashboard/ui/main/MainScreenViewModel.kt
index 6ac861c..0b4a4ab 100644
--- a/app/src/main/java/com/example/esp32aldldashboard/ui/main/MainScreenViewModel.kt
+++ b/app/src/main/java/com/example/esp32aldldashboard/ui/main/MainScreenViewModel.kt
@@ -1,42 +1,54 @@
 package com.example.esp32aldldashboard.ui.main
 
-import android.content.Context
 import androidx.lifecycle.ViewModel
-import com.example.esp32aldldashboard.bluetooth.BluetoothService
+import androidx.lifecycle.viewModelScope
 import com.example.esp32aldldashboard.bluetooth.ConnectionState
 import com.example.esp32aldldashboard.parser.ALDLFrame
-import kotlinx.coroutines.flow.MutableStateFlow
+import com.example.esp32aldldashboard.repository.SettingsRepository
+import com.example.esp32aldldashboard.repository.TelemetryRepository
+import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
 
-class MainScreenViewModel(context: Context) : ViewModel() {
-    private val bluetoothService = BluetoothService(context.applicationContext)
+class MainScreenViewModel(
+    private val telemetryRepository: TelemetryRepository,
+    private val settingsRepository: SettingsRepository
+) : ViewModel() {
 
-    val connectionState: StateFlow<ConnectionState> = bluetoothService.connectionState
-    val latestFrame: StateFlow<ALDLFrame?> = bluetoothService.latestFrame
-    val rawHexLog: StateFlow<List<String>> = bluetoothService.rawHexLog
-    val errorMessage: StateFlow<String> = bluetoothService.errorMessage
+    val connectionState: StateFlow<ConnectionState> = telemetryRepository.connectionState
+    val latestFrame: StateFlow<ALDLFrame?> = telemetryRepository.latestFrame
+    val rawHexLog: StateFlow<List<String>> = telemetryRepository.rawHexLog
+    val errorMessage: StateFlow<String> = telemetryRepository.errorMessage
 
-    private val _isCelsius = MutableStateFlow(false) // Default to Fahrenheit for standard 80s GM telemetry
-    val isCelsius: StateFlow<Boolean> = _isCelsius
+    val framesReceived: StateFlow<Int> = telemetryRepository.framesReceived
+    val parseErrors: StateFlow<Int> = telemetryRepository.parseErrors
+    val currentFrameRate: StateFlow<Int> = telemetryRepository.currentFrameRate
+
+    val isCelsius: StateFlow<Boolean> = settingsRepository.isCelsiusFlow
+        .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5000), false)
 
     fun toggleTemperatureUnit() {
-        _isCelsius.value = !_isCelsius.value
+        viewModelScope.launch {
+            val currentValue = isCelsius.value
+            settingsRepository.setIsCelsius(!currentValue)
+        }
     }
 
     fun connect() {
-        bluetoothService.connect()
+        telemetryRepository.connect()
     }
 
     fun disconnect() {
-        bluetoothService.disconnect()
+        telemetryRepository.disconnect()
     }
 
     fun startSimulation() {
-        bluetoothService.startSimulation()
+        telemetryRepository.startSimulation()
     }
 
     override fun onCleared() {
         super.onCleared()
-        bluetoothService.disconnect()
+        telemetryRepository.disconnect()
     }
 }
diff --git a/app/src/main/java/com/example/esp32aldldashboard/ui/main/MainScreenViewModelFactory.kt b/app/src/main/java/com/example/esp32aldldashboard/ui/main/MainScreenViewModelFactory.kt
new file mode 100644
index 0000000..b0b7134
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/ui/main/MainScreenViewModelFactory.kt
@@ -0,0 +1,20 @@
+package com.example.esp32aldldashboard.ui.main
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import com.example.esp32aldldashboard.repository.SettingsRepository
+import com.example.esp32aldldashboard.repository.TelemetryRepository
+
+class MainScreenViewModelFactory(
+    private val telemetryRepository: TelemetryRepository,
+    private val settingsRepository: SettingsRepository
+) : ViewModelProvider.Factory {
+
+    @Suppress("UNCHECKED_CAST")
+    override fun <T : ViewModel> create(modelClass: Class<T>): T {
+        if (modelClass.isAssignableFrom(MainScreenViewModel::class.java)) {
+            return MainScreenViewModel(telemetryRepository, settingsRepository) as T
+        }
+        throw IllegalArgumentException("Unknown ViewModel class: ${modelClass.name}")
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/ui/settings/LogFilesDialog.kt b/app/src/main/java/com/example/esp32aldldashboard/ui/settings/LogFilesDialog.kt
new file mode 100644
index 0000000..e83406c
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/ui/settings/LogFilesDialog.kt
@@ -0,0 +1,137 @@
+package com.example.esp32aldldashboard.ui.settings
+
+import android.content.Intent
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.InsertDriveFile
+import androidx.compose.material.icons.filled.Share
+import androidx.compose.material3.*
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.unit.dp
+import androidx.core.content.FileProvider
+import com.example.esp32aldldashboard.repository.FileType
+import com.example.esp32aldldashboard.repository.LoggedFile
+
+@Composable
+fun LogFilesDialog(
+    files: List<LoggedFile>,
+    onDismiss: () -> Unit
+) {
+    val context = LocalContext.current
+
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text("Logged Files (${files.size})") },
+        text = {
+            if (files.isEmpty()) {
+                Box(
+                    modifier = Modifier.fillMaxWidth().height(100.dp),
+                    contentAlignment = Alignment.Center
+                ) {
+                    Text(
+                        text = "No log files found in Downloads/ALDLLogs",
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                    )
+                }
+            } else {
+                LazyColumn(
+                    verticalArrangement = Arrangement.spacedBy(8.dp)
+                ) {
+                    items(files) { file ->
+                        FileListItem(
+                            file = file,
+                            onOpen = {
+                                try {
+                                    val intent = Intent(Intent.ACTION_VIEW).apply {
+                                        setDataAndType(file.uri, when(file.type) {
+                                            FileType.CSV -> "text/csv"
+                                            FileType.BINARY -> "application/octet-stream"
+                                        })
+                                        addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+                                    }
+                                    context.startActivity(intent)
+                                } catch (e: Exception) {
+                                    // No app available to open file
+                                }
+                            },
+                            onShare = {
+                                val shareIntent = Intent(Intent.ACTION_SEND).apply {
+                                    type = when(file.type) {
+                                        FileType.CSV -> "text/csv"
+                                        FileType.BINARY -> "application/octet-stream"
+                                    }
+                                    putExtra(Intent.EXTRA_STREAM, file.uri)
+                                    putExtra(Intent.EXTRA_SUBJECT, file.name)
+                                }
+                                context.startActivity(Intent.createChooser(shareIntent, "Share ${file.name}"))
+                            }
+                        )
+                    }
+                }
+            }
+        },
+        confirmButton = {
+            TextButton(onClick = onDismiss) {
+                Text("Close")
+            }
+        }
+    )
+}
+
+@Composable
+private fun FileListItem(
+    file: LoggedFile,
+    onOpen: () -> Unit,
+    onShare: () -> Unit
+) {
+    Card(
+        modifier = Modifier.fillMaxWidth(),
+        colors = CardDefaults.cardColors(
+            containerColor = MaterialTheme.colorScheme.surfaceVariant
+        ),
+        onClick = onOpen
+    ) {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(12.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            Icon(
+                imageVector = Icons.Default.InsertDriveFile,
+                contentDescription = null,
+                tint = when(file.type) {
+                    FileType.CSV -> MaterialTheme.colorScheme.primary
+                    FileType.BINARY -> MaterialTheme.colorScheme.tertiary
+                }
+            )
+            
+            Spacer(modifier = Modifier.width(12.dp))
+            
+            Column(modifier = Modifier.weight(1f)) {
+                Text(
+                    text = file.name,
+                    style = MaterialTheme.typography.bodyMedium,
+                    maxLines = 1
+                )
+                Text(
+                    text = "${file.getFormattedDate()} • ${file.getFormattedSize()}",
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            }
+            
+            IconButton(onClick = onShare) {
+                Icon(
+                    imageVector = Icons.Default.Share,
+                    contentDescription = "Share"
+                )
+            }
+        }
+    }
+}
diff --git a/app/src/main/java/com/example/esp32aldldashboard/ui/settings/SettingsScreen.kt b/app/src/main/java/com/example/esp32aldldashboard/ui/settings/SettingsScreen.kt
new file mode 100644
index 0000000..874a92a
--- /dev/null
+++ b/app/src/main/java/com/example/esp32aldldashboard/ui/settings/SettingsScreen.kt
@@ -0,0 +1,143 @@
+package com.example.esp32aldldashboard.ui.settings
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.FolderOpen
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.example.esp32aldldashboard.repository.LoggedFile
+import com.example.esp32aldldashboard.repository.SettingsRepository
+import kotlinx.coroutines.launch
+
+@Composable
+fun SettingsScreen(
+    settingsRepository: SettingsRepository,
+    modifier: Modifier = Modifier
+) {
+    val isCelsius by settingsRepository.isCelsiusFlow.collectAsStateWithLifecycle(initialValue = false)
+    val autoLogging by settingsRepository.autoLoggingFlow.collectAsStateWithLifecycle(initialValue = false)
+    val recordRawData by settingsRepository.recordRawDataFlow.collectAsStateWithLifecycle(initialValue = false)
+    val coolantThreshold by settingsRepository.coolantAlertThresholdFlow.collectAsStateWithLifecycle(initialValue = 100f)
+
+    var showLogFilesDialog by remember { mutableStateOf(false) }
+    var logFiles by remember { mutableStateOf<List<LoggedFile>>(emptyList()) }
+
+    val coroutineScope = rememberCoroutineScope()
+
+    Column(modifier = modifier.fillMaxSize().padding(16.dp)) {
+        Text(
+            text = "Settings & Alerts",
+            style = MaterialTheme.typography.headlineMedium,
+            color = MaterialTheme.colorScheme.onBackground
+        )
+        Spacer(modifier = Modifier.height(24.dp))
+
+        // Temperature Unit Toggle
+        Row(
+            modifier = Modifier.fillMaxWidth().padding(vertical = 8.dp),
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.SpaceBetween
+        ) {
+            Column {
+                Text(text = "Temperature Unit", style = MaterialTheme.typography.titleMedium)
+                Text(text = if (isCelsius) "Celsius (°C)" else "Fahrenheit (°F)", style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant)
+            }
+            Switch(
+                checked = isCelsius,
+                onCheckedChange = { 
+                    coroutineScope.launch { settingsRepository.setIsCelsius(it) } 
+                }
+            )
+        }
+        Divider(modifier = Modifier.padding(vertical = 8.dp))
+
+        // Auto Logging Toggle
+        Row(
+            modifier = Modifier.fillMaxWidth().padding(vertical = 8.dp),
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.SpaceBetween
+        ) {
+            Column {
+                Text(text = "Auto-Log Sessions", style = MaterialTheme.typography.titleMedium)
+                Text(text = "Automatically save CSV and database records.", style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant)
+            }
+            Switch(
+                checked = autoLogging,
+                onCheckedChange = { 
+                    coroutineScope.launch { settingsRepository.setAutoLogging(it) } 
+                }
+            )
+        }
+        Divider(modifier = Modifier.padding(vertical = 8.dp))
+
+        // Raw Data Recording Toggle (Debug)
+        Row(
+            modifier = Modifier.fillMaxWidth().padding(vertical = 8.dp),
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.SpaceBetween
+        ) {
+            Column {
+                Text(text = "Record Raw Datastream (Debug)", style = MaterialTheme.typography.titleMedium)
+                Text(text = "Save binary .bin files for debugging.", style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant)
+            }
+            Switch(
+                checked = recordRawData,
+                onCheckedChange = { 
+                    coroutineScope.launch { settingsRepository.setRecordRawData(it) } 
+                }
+            )
+        }
+        Divider(modifier = Modifier.padding(vertical = 8.dp))
+
+        // View Logged Files
+        Row(
+            modifier = Modifier.fillMaxWidth().padding(vertical = 8.dp),
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.SpaceBetween
+        ) {
+            Column(modifier = Modifier.weight(1f)) {
+                Text(text = "View Logged Files", style = MaterialTheme.typography.titleMedium)
+                Text(text = "Browse CSV and binary logs", style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant)
+            }
+            Button(
+                onClick = {
+                    coroutineScope.launch {
+                        logFiles = settingsRepository.getLoggedFiles()
+                        showLogFilesDialog = true
+                    }
+                }
+            ) {
+                Icon(Icons.Default.FolderOpen, contentDescription = null)
+                Spacer(modifier = Modifier.width(4.dp))
+                Text("Open")
+            }
+        }
+        Divider(modifier = Modifier.padding(vertical = 8.dp))
+
+        // Coolant Alert Threshold
+        Column(modifier = Modifier.fillMaxWidth().padding(vertical = 8.dp)) {
+            Text(text = "Coolant Alert Threshold", style = MaterialTheme.typography.titleMedium)
+            Text(text = "Trigger notification when coolant exceeds ${coolantThreshold.toInt()}°C", style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant)
+            Slider(
+                value = coolantThreshold,
+                onValueChange = { 
+                    coroutineScope.launch { settingsRepository.setCoolantAlertThreshold(it) } 
+                },
+                valueRange = 80f..150f,
+                steps = 70
+            )
+        }
+    }
+
+    // Log Files Dialog
+    if (showLogFilesDialog) {
+        LogFilesDialog(
+            files = logFiles,
+            onDismiss = { showLogFilesDialog = false }
+        )
+    }
+}
diff --git a/app/src/test/java/com/example/esp32aldldashboard/ALDLParserTest.kt b/app/src/test/java/com/example/esp32aldldashboard/ALDLParserTest.kt
index 97fd9c9..b2c920c 100644
--- a/app/src/test/java/com/example/esp32aldldashboard/ALDLParserTest.kt
+++ b/app/src/test/java/com/example/esp32aldldashboard/ALDLParserTest.kt
@@ -19,9 +19,9 @@ class ALDLParserTest {
             0x00.toByte(), 0x00.toByte(), 0xC9.toByte(), 0x02.toByte(), 0x62.toByte()
         )
 
-        val frame = ALDLParser.parseFrame(rawPayload)
-        assertNotNull(frame)
-        frame!!
+        val result = ALDLParser.parseFrame(rawPayload)
+        assertTrue(result is com.example.esp32aldldashboard.parser.ALDLParseResult.Success)
+        val frame = (result as com.example.esp32aldldashboard.parser.ALDLParseResult.Success).frame
 
         // Assert values based on 24-INT10.ads specifications:
         assertEquals(95, frame.iacPosition) // u[3] (Byte 4)
@@ -70,4 +70,95 @@ class ALDLParserTest {
         assertFalse(frame.isClosedLoop) // bit 7 of u[14] is 0
         assertFalse(frame.isRich)       // bit 6 of u[14] is 0
     }
+
+    @Test
+    fun testRpmBoundaryValues() {
+        // Max representable RPM: 6375 (255 * 25)
+        val validPayload = createBasePayload().apply {
+            this[7] = 255.toByte() // 255 * 25 = 6375 RPM
+        }
+        val validResult = ALDLParser.parseFrame(validPayload)
+        assertTrue("Max representable RPM should be valid", validResult is com.example.esp32aldldashboard.parser.ALDLParseResult.Success)
+    }
+
+    @Test
+    fun testBatteryVoltageBoundaryValues() {
+        // Min valid: 8V (80 * 0.1 = 8.0V)
+        val minPayload = createBasePayload().apply {
+            this[17] = 80.toByte()
+        }
+        val minResult = ALDLParser.parseFrame(minPayload)
+        assertTrue("Battery at 8V should be valid", minResult is com.example.esp32aldldashboard.parser.ALDLParseResult.Success)
+
+        // Max valid: 18V (180 * 0.1 = 18.0V)
+        val maxPayload = createBasePayload().apply {
+            this[17] = 180.toByte()
+        }
+        val maxResult = ALDLParser.parseFrame(maxPayload)
+        assertTrue("Battery at 18V should be valid", maxResult is com.example.esp32aldldashboard.parser.ALDLParseResult.Success)
+
+        // Too low: 4.9V (49 * 0.1 = 4.9V, below 5V minimum)
+        val lowPayload = createBasePayload().apply {
+            this[17] = 49.toByte()
+        }
+        val lowResult = ALDLParser.parseFrame(lowPayload)
+        assertTrue("Battery below 5V should be rejected", lowResult is com.example.esp32aldldashboard.parser.ALDLParseResult.InvalidData)
+
+        // Too high: 20.1V (201 * 0.1 = 20.1V, above 20V maximum)
+        val highPayload = createBasePayload().apply {
+            this[17] = 201.toByte()
+        }
+        val highResult = ALDLParser.parseFrame(highPayload)
+        assertTrue("Battery above 20V should be rejected", highResult is com.example.esp32aldldashboard.parser.ALDLParseResult.InvalidData)
+    }
+
+    @Test
+    fun testTpsVoltageBoundaryValues() {
+        // Max representable TPS: 5.0V (255 * 0.019608)
+        val validPayload = createBasePayload().apply {
+            this[8] = 255.toByte()
+        }
+        val validResult = ALDLParser.parseFrame(validPayload)
+        assertTrue("Max representable TPS should be valid", validResult is com.example.esp32aldldashboard.parser.ALDLParseResult.Success)
+    }
+
+    @Test
+    fun testCoolantTempBoundaryValues() {
+        // Valid temperature: 89 * 0.75 - 40 = 26.75C (within -45 to 220 range)
+        val validPayload = createBasePayload()
+        val validResult = ALDLParser.parseFrame(validPayload)
+        assertTrue("Valid coolant temp should be accepted", validResult is com.example.esp32aldldashboard.parser.ALDLParseResult.Success)
+
+        // Max representable: 255 * 0.75 - 40 = 151.25C
+        val maxPayload = createBasePayload().apply {
+            this[4] = 255.toByte()
+        }
+        val maxResult = ALDLParser.parseFrame(maxPayload)
+        assertTrue("Max representable coolant temp should be accepted", maxResult is com.example.esp32aldldashboard.parser.ALDLParseResult.Success)
+
+        // Min representable: 0 * 0.75 - 40 = -40C
+        val minPayload = createBasePayload().apply {
+            this[4] = 0.toByte()
+        }
+        val minResult = ALDLParser.parseFrame(minPayload)
+        assertTrue("Min representable coolant temp should be accepted", minResult is com.example.esp32aldldashboard.parser.ALDLParseResult.Success)
+    }
+
+    @Test
+    fun testIncompletePayload() {
+        // Payload with only 24 bytes (incomplete)
+        val incompletePayload = ByteArray(24) { 0x20.toByte() }
+        val result = ALDLParser.parseFrame(incompletePayload)
+        assertTrue("Incomplete payload should return Incomplete result", result is com.example.esp32aldldashboard.parser.ALDLParseResult.Incomplete)
+    }
+
+    private fun createBasePayload(): ByteArray {
+        return byteArrayOf(
+            0x20.toByte(), 0x00.toByte(), 0x2A.toByte(), 0x5F.toByte(), 0x59.toByte(),
+            0x00.toByte(), 0xF4.toByte(), 0x00.toByte(), 0x1E.toByte(), 0x80.toByte(),
+            0x65.toByte(), 0x08.toByte(), 0x00.toByte(), 0x00.toByte(), 0x00.toByte(),
+            0x25.toByte(), 0x18.toByte(), 0x7D.toByte(), 0x80.toByte(), 0x00.toByte(),
+            0x00.toByte(), 0x00.toByte(), 0xC9.toByte(), 0x02.toByte(), 0x62.toByte()
+        )
+    }
 }
diff --git a/app/src/test/java/com/example/esp32aldldashboard/RingBufferTest.kt b/app/src/test/java/com/example/esp32aldldashboard/RingBufferTest.kt
new file mode 100644
index 0000000..4ed3eb5
--- /dev/null
+++ b/app/src/test/java/com/example/esp32aldldashboard/RingBufferTest.kt
@@ -0,0 +1,27 @@
+package com.example.esp32aldldashboard.parser
+
+import org.junit.Assert.*
+import org.junit.Test
+
+class RingBufferTest {
+
+    @Test
+    fun testALDLParseResultSafety() {
+        val validPayload = ByteArray(25) { 0 }
+        // Coolant = 0 (0 * 0.75 - 40 = -40 C) -> Valid
+        // Battery = 120 (120 * 0.1 = 12 V) -> Valid
+        validPayload[17] = 120.toByte()
+        
+        val result = ALDLParser.parseFrame(validPayload)
+        assertTrue("Expected valid parsing", result is ALDLParseResult.Success)
+
+        val invalidBatteryPayload = validPayload.clone()
+        invalidBatteryPayload[17] = 250.toByte() // 250 * 0.1 = 25 V -> Invalid (> 20V)
+        val resultInvalid = ALDLParser.parseFrame(invalidBatteryPayload)
+        assertTrue("Expected invalid parsing", resultInvalid is ALDLParseResult.InvalidData)
+
+        val incompletePayload = ByteArray(10)
+        val resultIncomplete = ALDLParser.parseFrame(incompletePayload)
+        assertTrue("Expected incomplete parsing", resultIncomplete is ALDLParseResult.Incomplete)
+    }
+}
diff --git a/app/src/test/java/com/example/esp32aldldashboard/ui/main/MainScreenViewModelTest.kt b/app/src/test/java/com/example/esp32aldldashboard/ui/main/MainScreenViewModelTest.kt
index d4f1252..fee86e9 100644
--- a/app/src/test/java/com/example/esp32aldldashboard/ui/main/MainScreenViewModelTest.kt
+++ b/app/src/test/java/com/example/esp32aldldashboard/ui/main/MainScreenViewModelTest.kt
@@ -1,29 +1,62 @@
+@file:OptIn(kotlinx.coroutines.ExperimentalCoroutinesApi::class)
 package com.example.esp32aldldashboard.ui.main
 
-import android.content.Context
-import android.content.ContextWrapper
 import com.example.esp32aldldashboard.bluetooth.ConnectionState
+import com.example.esp32aldldashboard.repository.SettingsRepository
+import com.example.esp32aldldashboard.repository.TelemetryRepository
+import io.mockk.*
 import junit.framework.TestCase.assertEquals
 import junit.framework.TestCase.assertFalse
 import junit.framework.TestCase.assertTrue
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.runCurrent
 import kotlinx.coroutines.test.runTest
+import kotlinx.coroutines.test.setMain
+import org.junit.After
+import org.junit.Before
 import org.junit.Test
 
 class MainScreenViewModelTest {
 
-    private class FakeContext : ContextWrapper(null) {
-        override fun getApplicationContext(): Context {
-            return this
-        }
-        override fun getSystemService(name: String): Any? {
-            return null
+    private val testDispatcher = UnconfinedTestDispatcher()
+    private val telemetryRepository = mockk<TelemetryRepository>(relaxed = true)
+    private val settingsRepository = mockk<SettingsRepository>(relaxed = true)
+    private val isCelsiusFlow = MutableStateFlow(false)
+
+    @Before
+    fun setUp() {
+        Dispatchers.setMain(testDispatcher)
+        clearAllMocks()
+        
+        // Stub telemetry repository flows
+        every { telemetryRepository.connectionState } returns MutableStateFlow(ConnectionState.DISCONNECTED)
+        every { telemetryRepository.latestFrame } returns MutableStateFlow(null)
+        every { telemetryRepository.rawHexLog } returns MutableStateFlow(emptyList())
+        every { telemetryRepository.errorMessage } returns MutableStateFlow("")
+        every { telemetryRepository.framesReceived } returns MutableStateFlow(0)
+        every { telemetryRepository.parseErrors } returns MutableStateFlow(0)
+        every { telemetryRepository.currentFrameRate } returns MutableStateFlow(0)
+        
+        // Stub settings repository
+        isCelsiusFlow.value = false
+        every { settingsRepository.isCelsiusFlow } returns isCelsiusFlow
+        coEvery { settingsRepository.setIsCelsius(any()) } answers {
+            isCelsiusFlow.value = firstArg()
         }
     }
 
+    @After
+    fun tearDown() {
+        Dispatchers.resetMain()
+    }
+
     @Test
     fun testInitialStates() = runTest {
-        val context = FakeContext()
-        val viewModel = MainScreenViewModel(context)
+        val viewModel = MainScreenViewModel(telemetryRepository, settingsRepository)
         
         assertEquals(ConnectionState.DISCONNECTED, viewModel.connectionState.value)
         assertEquals(null, viewModel.latestFrame.value)
@@ -32,13 +65,21 @@ class MainScreenViewModelTest {
 
     @Test
     fun testToggleTemperatureUnit() = runTest {
-        val context = FakeContext()
-        val viewModel = MainScreenViewModel(context)
+        val viewModel = MainScreenViewModel(telemetryRepository, settingsRepository)
+        
+        // Start collecting to activate WhileSubscribed stateIn flow
+        backgroundScope.launch(testDispatcher) {
+            viewModel.isCelsius.collect {}
+        }
         
         assertFalse(viewModel.isCelsius.value)
+        
         viewModel.toggleTemperatureUnit()
+        
         assertTrue(viewModel.isCelsius.value)
+        
         viewModel.toggleTemperatureUnit()
+        
         assertFalse(viewModel.isCelsius.value)
     }
 }
diff --git a/build.gradle.kts b/build.gradle.kts
index bb92a46..9903cc3 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -3,4 +3,5 @@ plugins {
   alias(libs.plugins.android.application) apply false
   alias(libs.plugins.compose.compiler) apply false
   alias(libs.plugins.kotlin.serialization) apply false
+  alias(libs.plugins.ksp) apply false
 }
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
index 32d72a9..419e240 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -27,3 +27,4 @@ kotlin.code.style=official
 # resources declared in the library itself and none from the library's dependencies,
 # thereby reducing the size of the R class for that library
 android.nonTransitiveRClass=true
+android.disallowKotlinSourceSets=false
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 660fd3a..fa69ce7 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -10,15 +10,21 @@ androidxTestRunner = "1.7.0"
 androidxTestEspresso = "3.7.0"
 coroutines = "1.10.2"
 junit = "4.13.2"
-kotlin = "2.3.20"
+kotlin = "2.1.0"
 nav3Core = "1.0.1"
 lifecycleViewmodelNav3 = "2.10.0"
+room = "2.6.1"
+datastore = "1.1.1"
+ksp = "2.1.0-1.0.29"
+mockk = "1.13.10"
 
 [libraries]
 androidx-core-ktx = { module = "androidx.core:core-ktx", version.ref = "androidxCore" }
 androidx-activity-compose = { module = "androidx.activity:activity-compose", version.ref = "androidxActivity" }
 androidx-compose-bom = { group = "androidx.compose", name = "compose-bom", version.ref = "androidxComposeBom" }
 androidx-compose-material3 = { group = "androidx.compose.material3", name = "material3"}
+androidx-compose-material-icons-core = { group = "androidx.compose.material", name = "material-icons-core" }
+androidx-compose-material-icons-extended = { group = "androidx.compose.material", name = "material-icons-extended" }
 androidx-compose-ui = { group = "androidx.compose.ui", name = "ui"}
 androidx-compose-ui-tooling-preview = { group = "androidx.compose.ui", name = "ui-tooling-preview"}
 androidx-compose-ui-test-junit4 = { group = "androidx.compose.ui", name = "ui-test-junit4"}
@@ -36,8 +42,14 @@ kotlinx-coroutines-test = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-t
 androidx-navigation3-runtime = { module = "androidx.navigation3:navigation3-runtime", version.ref = "nav3Core" }
 androidx-navigation3-ui = { module = "androidx.navigation3:navigation3-ui", version.ref = "nav3Core" }
 androidx-lifecycle-viewmodel-navigation3 = { module = "androidx.lifecycle:lifecycle-viewmodel-navigation3", version.ref = "lifecycleViewmodelNav3" }
+androidx-room-runtime = { module = "androidx.room:room-runtime", version.ref = "room" }
+androidx-room-ktx = { module = "androidx.room:room-ktx", version.ref = "room" }
+androidx-room-compiler = { module = "androidx.room:room-compiler", version.ref = "room" }
+androidx-datastore-preferences = { module = "androidx.datastore:datastore-preferences", version.ref = "datastore" }
+mockk = { module = "io.mockk:mockk", version.ref = "mockk" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "androidGradlePlugin" }
 compose-compiler = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
-kotlin-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
\ No newline at end of file
+kotlin-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
+ksp = { id = "com.google.devtools.ksp", version.ref = "ksp" }
\ No newline at end of file
diff --git a/ksp_versions.xml b/ksp_versions.xml
new file mode 100644
index 0000000..0b3839f
--- /dev/null
+++ b/ksp_versions.xml
@@ -0,0 +1,169 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<metadata>
+  <groupId>com.google.devtools.ksp</groupId>
+  <artifactId>com.google.devtools.ksp.gradle.plugin</artifactId>
+  <versioning>
+    <latest>2.3.9</latest>
+    <release>2.3.9</release>
+    <versions>
+      <version>1.5.21-1.0.0-beta07</version>
+      <version>1.5.30-1.0.0-beta08</version>
+      <version>1.5.30-1.0.0-beta09</version>
+      <version>1.5.30-1.0.0</version>
+      <version>1.5.31-1.0.0</version>
+      <version>1.5.31-1.0.1</version>
+      <version>1.6.0-M1-1.0.0</version>
+      <version>1.6.0-RC-1.0.1-RC</version>
+      <version>1.6.0-RC-1.0.0</version>
+      <version>1.6.0-1.0.1</version>
+      <version>1.6.0-1.0.2</version>
+      <version>1.6.10-RC-1.0.1</version>
+      <version>1.6.10-1.0.2</version>
+      <version>1.6.10-1.0.3</version>
+      <version>1.6.10-1.0.4</version>
+      <version>1.6.20-M1-1.0.2</version>
+      <version>1.6.20-RC-1.0.4</version>
+      <version>1.6.20-RC2-1.0.4</version>
+      <version>1.6.20-1.0.4</version>
+      <version>1.6.20-1.0.5</version>
+      <version>1.6.21-1.0.5</version>
+      <version>1.6.21-1.0.6</version>
+      <version>1.7.0-Beta-1.0.5</version>
+      <version>1.7.0-RC-1.0.5</version>
+      <version>1.7.0-RC2-1.0.5</version>
+      <version>1.7.0-1.0.6</version>
+      <version>1.7.10-1.0.6</version>
+      <version>1.7.20-Beta-1.0.6</version>
+      <version>1.7.20-RC-1.0.6</version>
+      <version>1.7.20-1.0.6</version>
+      <version>1.7.20-1.0.7</version>
+      <version>1.7.20-1.0.8</version>
+      <version>1.7.21-1.0.8</version>
+      <version>1.7.22-1.0.8</version>
+      <version>1.8.0-Beta-1.0.8</version>
+      <version>1.8.0-RC-1.0.8</version>
+      <version>1.8.0-RC2-1.0.8</version>
+      <version>1.8.0-1.0.8</version>
+      <version>1.8.0-1.0.9</version>
+      <version>1.8.10-1.0.9</version>
+      <version>1.8.20-Beta-1.0.9</version>
+      <version>1.8.20-RC-1.0.9</version>
+      <version>1.8.20-RC2-1.0.9</version>
+      <version>1.8.20-1.0.10</version>
+      <version>1.8.20-1.0.11</version>
+      <version>1.8.21-1.0.11</version>
+      <version>1.8.22-1.0.11</version>
+      <version>1.9.0-Beta-1.0.11</version>
+      <version>1.9.0-RC-1.0.11</version>
+      <version>1.9.0-1.0.11</version>
+      <version>1.9.0-1.0.12</version>
+      <version>1.9.0-1.0.13</version>
+      <version>1.9.10-1.0.13</version>
+      <version>1.9.20-Beta-1.0.13</version>
+      <version>1.9.20-Beta2-1.0.13</version>
+      <version>1.9.20-RC-1.0.13</version>
+      <version>1.9.20-RC2-1.0.13</version>
+      <version>1.9.20-1.0.13</version>
+      <version>1.9.20-1.0.14</version>
+      <version>1.9.21-1.0.15</version>
+      <version>1.9.21-1.0.16</version>
+      <version>1.9.22-1.0.16</version>
+      <version>1.9.22-1.0.17</version>
+      <version>1.9.22-1.0.18</version>
+      <version>1.9.23-1.0.19</version>
+      <version>1.9.23-1.0.20</version>
+      <version>1.9.24-1.0.20</version>
+      <version>1.9.25-1.0.20</version>
+      <version>2.0.0-Beta1-1.0.15</version>
+      <version>2.0.0-Beta1-1.0.14</version>
+      <version>2.0.0-Beta2-1.0.16</version>
+      <version>2.0.0-Beta3-1.0.17</version>
+      <version>2.0.0-Beta4-1.0.19</version>
+      <version>2.0.0-Beta4-1.0.18</version>
+      <version>2.0.0-Beta4-1.0.17</version>
+      <version>2.0.0-Beta5-1.0.20</version>
+      <version>2.0.0-Beta5-1.0.19</version>
+      <version>2.0.0-RC1-1.0.20</version>
+      <version>2.0.0-RC2-1.0.20</version>
+      <version>2.0.0-RC3-1.0.20</version>
+      <version>2.0.0-1.0.21</version>
+      <version>2.0.0-1.0.22</version>
+      <version>2.0.0-1.0.23</version>
+      <version>2.0.0-1.0.24</version>
+      <version>2.0.10-RC-1.0.23</version>
+      <version>2.0.10-RC2-1.0.24</version>
+      <version>2.0.10-1.0.24</version>
+      <version>2.0.20-Beta1-1.0.22</version>
+      <version>2.0.20-Beta2-1.0.23</version>
+      <version>2.0.20-RC-1.0.24</version>
+      <version>2.0.20-RC2-1.0.24</version>
+      <version>2.0.20-1.0.24</version>
+      <version>2.0.20-1.0.25</version>
+      <version>2.0.21-RC-1.0.25</version>
+      <version>2.0.21-1.0.25</version>
+      <version>2.0.21-1.0.26</version>
+      <version>2.0.21-1.0.27</version>
+      <version>2.0.21-1.0.28</version>
+      <version>2.1.0-Beta1-1.0.25</version>
+      <version>2.1.0-Beta2-1.0.26</version>
+      <version>2.1.0-Beta2-1.0.25</version>
+      <version>2.1.0-RC-1.0.26</version>
+      <version>2.1.0-RC-1.0.27</version>
+      <version>2.1.0-RC2-1.0.28</version>
+      <version>2.1.0-1.0.28</version>
+      <version>2.1.0-1.0.29</version>
+      <version>2.1.10-RC-1.0.29</version>
+      <version>2.1.10-RC2-1.0.29</version>
+      <version>2.1.10-1.0.29</version>
+      <version>2.1.10-1.0.30</version>
+      <version>2.1.10-1.0.31</version>
+      <version>2.1.20-Beta1-1.0.29</version>
+      <version>2.1.20-Beta2-1.0.30</version>
+      <version>2.1.20-Beta2-1.0.29</version>
+      <version>2.1.20-RC-1.0.30</version>
+      <version>2.1.20-RC-1.0.31</version>
+      <version>2.1.20-RC2-1.0.31</version>
+      <version>2.1.20-RC3-1.0.31</version>
+      <version>2.1.20-1.0.31</version>
+      <version>2.1.20-1.0.32</version>
+      <version>2.1.20-2.0.0</version>
+      <version>2.1.20-2.0.1</version>
+      <version>2.1.21-RC-2.0.0</version>
+      <version>2.1.21-RC2-2.0.1</version>
+      <version>2.1.21-2.0.1</version>
+      <version>2.1.21-2.0.2</version>
+      <version>2.2.0-Beta1-2.0.0</version>
+      <version>2.2.0-Beta2-2.0.1</version>
+      <version>2.2.0-RC-2.0.1</version>
+      <version>2.2.0-RC2-2.0.1</version>
+      <version>2.2.0-RC2-2.0.2</version>
+      <version>2.2.0-RC3-2.0.2</version>
+      <version>2.2.0-2.0.2</version>
+      <version>2.2.10-RC-2.0.2</version>
+      <version>2.2.10-RC2-2.0.2</version>
+      <version>2.2.10-2.0.2</version>
+      <version>2.2.20-Beta1-2.0.2</version>
+      <version>2.2.20-Beta2-2.0.2</version>
+      <version>2.2.20-RC-2.0.2</version>
+      <version>2.2.20-RC2-2.0.2</version>
+      <version>2.2.20-2.0.2</version>
+      <version>2.2.20-2.0.3</version>
+      <version>2.2.20-2.0.4</version>
+      <version>2.2.21-RC-2.0.4</version>
+      <version>2.2.21-RC2-2.0.4</version>
+      <version>2.2.21-2.0.4</version>
+      <version>2.2.21-2.0.5</version>
+      <version>2.3.0</version>
+      <version>2.3.1</version>
+      <version>2.3.2</version>
+      <version>2.3.3</version>
+      <version>2.3.4</version>
+      <version>2.3.5</version>
+      <version>2.3.6</version>
+      <version>2.3.7</version>
+      <version>2.3.8</version>
+      <version>2.3.9</version>
+    </versions>
+    <lastUpdated>20260526194322</lastUpdated>
+  </versioning>
+</metadata>