Arduino-HomeKit-ESP8266 icon indicating copy to clipboard operation
Arduino-HomeKit-ESP8266 copied to clipboard

Published 20 hours ago • verified publisher icon Mixiaoxiao

DHT22 sensor error at start up

Open gio-dude opened this issue 4 years ago • 3 comments
trafficstars

So I don't know if this hardware or software issue. I got the example temperature sketch to work but after start up the serial monitoring display nam for the results of the temp and Humidity until i disconnect power pin to the sensor and reconnect it. then it works fine.

Im using a nodeMCU I have the sensor connected to pin D4 with a 10k resistor between data and power.

gio-dude avatar Feb 18 '21 02:02 gio-dude

@gio-dude I have the same problem same as you with DHT22. I didn't find what's the problem. But I just fix the problem by using some trasistor to control 3.3V. When it boot finish quite a while I program it to reboot to turn off and on DHT22.

Varogkorn avatar Mar 06 '21 16:03 Varogkorn

Ok so if I understand correctly you are using transistors to power cycles he temperature sensor once the esp finishes its boot cycle.

gio-dude avatar Mar 06 '21 16:03 gio-dude

Ok so if I understand correctly you are using transistors to power cycles he temperature sensor once the esp finishes its boot cycle.

Yes

Varogkorn avatar Mar 08 '21 03:03 Varogkorn