Rick Lutz asked 5 years ago
My DHT 22 quits responding if I reset the ESP8266. It will only start responding if I cycle the 3.3V to the DHT. I can see the DHT is getting the start pulse but does not return the data string until I cycle the DHT power. After cycling DHT power it works continuously.
Only running sample DHT code from ADAfruit
Sara Santos Staff answered 5 years ago
Hi Rick.
Can you tell me the connections between your ESP8266 and the DHT22?
And what ESP8266 model are you using?
Regards,
Sara
Rick Lutz answered 5 years ago
LoLin NodeMCU V3 – I assume ESP8266-12E.
DHT board had resistor built in
DHT-1=3.3V, DHT-3=Gnd, DHT-2=D4(GPIO2)
Sara Santos Staff answered 5 years ago
Hi Rick.
Can you connect pin 2 to another GPIO? Try GPIO4.
GPIO 2 is HIGH at boot, which can interfere with the readings: https://randomnerdtutorials.com/esp8266-pinout-reference-gpios/
Regards,
Sara
Rick Lutz answered 5 years ago
Sara, thank you that was it. I was using GPIO 4 and 5 for web control, I will do some re-writing/connecting.