From 511e2ed19ac27265e76a683a9d1afeae7ced9319 Mon Sep 17 00:00:00 2001 From: Vitor de Miranda Henrique Date: Tue, 2 Jan 2018 09:48:05 -0600 Subject: [PATCH] Update README.md --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index c67b625..95f4379 100644 --- a/README.md +++ b/README.md @@ -23,7 +23,7 @@ To control the encosure temperature or get temperature trigged events, you need Wire the sensor following the wiring diagram on the pictures on thingiverse, you can use any GPIO pin. -For DHT11 and DHT22 sensors, don't forget to connect a 4.7K - 10K resistor from the data pin to VCC +For DHT11 and DHT22 sensors, don't forget to connect a 4.7K - 10K resistor from the data pin to VCC. Also, be aware that DHT sensors some times can not work reliably on linux, this is a limitation of reading DHT sensors from Linux--there's no guarantee the program will be given enough priority and time by the Linux kernel to reliably read the sensor. Another common issue is the power supply. you need a constant and good 3.3V, sometimes a underpowered raspberry pi will not have a solid 3.3V power supply, so you could try powering the sensor with 5V and using a level shifter on the read pin. You need to install Adafruit library to use the temperature sensor on raspberry pi.