|
|
|
@@ -1,39 +1,76 @@
|
|
|
|
|
# ESP32 ALDL Dashboard Android Application
|
|
|
|
|
|
|
|
|
|
This Android app connects via Bluetooth SPP to an ESP32 microcontroller that interfaces with a 1986 Pontiac Fiero 1227170 ECM using the 160-baud ALDL (Assembly Line Diagnostic Link) datastream. It decodes the telemetry stream in real-time and displays it on a modern Jetpack Compose dashboard.
|
|
|
|
|
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.
|
|
|
|
|
|
|
|
|
|
## Features
|
|
|
|
|
---
|
|
|
|
|
|
|
|
|
|
* **Real-time Dashboard:** View essential engine metrics including Engine Speed (RPM), Vehicle Speed (MPH), Coolant Temperature, Manifold Air Temperature (MAT), Manifold Absolute Pressure (MAP), Throttle Position (TPS), O2 Sensor Voltage, and Battery Voltage.
|
|
|
|
|
* **Custom UI Components:** Beautiful animated Canvas-based radial RPM gauge and TPS bar graph.
|
|
|
|
|
* **Trouble Code Alerts:** Automatically decodes ECM active fault codes into human-readable alerts (e.g., Code 14 - Coolant Temperature Sensor High).
|
|
|
|
|
* **Status Flags:** Real-time visibility into Closed Loop, Rich Mixture, TCC Lockup, A/C Clutch requests, and more.
|
|
|
|
|
* **Derived Metrics:** Calculates estimated Engine Load and Fuel Flow Hint based on core telemetry data.
|
|
|
|
|
* **Real-Time Line Charts:** Built-in rolling graphs of RPM vs. Time, perfect for diagnostic troubleshooting.
|
|
|
|
|
* **Background Telemetry Logging:** Uses an Android Foreground Service to maintain the Bluetooth connection and record data seamlessly even when the app is minimized.
|
|
|
|
|
* **Local Persistence:** Uses Jetpack Room database to save full sessions with timestamped raw payloads.
|
|
|
|
|
* **CSV Data Export:** Automatically generates TunerPro RT compatible `.csv` log files in the `Downloads/ALDLLogs` folder using Android MediaStore APIs.
|
|
|
|
|
* **Settings & Configuration:** Persistent DataStore preferences for Unit Toggle (°C/°F), Auto-Logging toggles, and Coolant Alert Thresholds.
|
|
|
|
|
## 🌟 Key Features
|
|
|
|
|
|
|
|
|
|
## Architecture Highlights
|
|
|
|
|
* **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.
|
|
|
|
|
|
|
|
|
|
* **MVVM & StateFlow:** Strict MVVM separation of concerns. The UI reactivity is entirely driven by `StateFlow` streams.
|
|
|
|
|
* **Circular Ring Buffer Packet Parsing:** The Bluetooth ingest layer uses `ArrayDeque<Byte>` circular buffering. It constantly seeks the `AA 55` header, preventing misalignment desyncs over noisy lines.
|
|
|
|
|
* **Robust Parsers:** The `ALDLParser` encapsulates all scaling constants and interpolation arrays (for MAT) required by the TunerPro `24-INT10.ads` definition.
|
|
|
|
|
---
|
|
|
|
|
|
|
|
|
|
## Requirements
|
|
|
|
|
## 🛠️ Architecture & Technical Highlights
|
|
|
|
|
|
|
|
|
|
* Android Device running Android 8.0+ (Tested extensively against Android 13+)
|
|
|
|
|
* Bluetooth Permissions (Nearby Devices on Android 12+)
|
|
|
|
|
* ESP32 hardware module programmed with the accompanying ALDL datastream code.
|
|
|
|
|
* **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.
|
|
|
|
|
|
|
|
|
|
## Setup Instructions
|
|
|
|
|
---
|
|
|
|
|
|
|
|
|
|
1. Pair the ESP32 (named `ESP32-ALDL`) in your Android Bluetooth settings.
|
|
|
|
|
2. Grant the requested Bluetooth permissions inside the app.
|
|
|
|
|
3. Tap "Connect BT" to begin the telemetry stream.
|
|
|
|
|
4. Navigate to the **Settings** tab to toggle Auto-Logging or customize unit formats.
|
|
|
|
|
5. View historical `.csv` logs in your device's `Downloads/ALDLLogs` folder.
|
|
|
|
|
## 📱 Requirements
|
|
|
|
|
|
|
|
|
|
## Build Information
|
|
|
|
|
Developed using Android Studio and Gradle. Built with Jetpack Compose, Room (with KSP Annotation Processor), and DataStore.
|
|
|
|
|
* **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`).
|
|
|
|
|
|
|
|
|
|
---
|
|
|
|
|
|
|
|
|
|
## 🚀 Setup & Usage
|
|
|
|
|
|
|
|
|
|
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.
|
|
|
|
|
|
|
|
|
|
---
|
|
|
|
|
|
|
|
|
|
## 🧪 Testing & Verification
|
|
|
|
|
|
|
|
|
|
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).
|
|
|
|
|
|
|
|
|
|
To run the unit tests, execute the following Gradle command in the root project directory:
|
|
|
|
|
```bash
|
|
|
|
|
./gradlew test
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
### 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.
|
