no useful values from dht22

[thk4711]

Hi,

i uploaded the dht22.lua module to the esp8266. Then I executed your example. I am getting no useful results: Temperature: -3277.3 deg C Temperature: -5867.9 deg F Humidity: -1.9% I connected the DHT22 on pin1 to 3.3V pins to GPIO2 (with 4.7k to 3.3V) 3 is unused and pin4 to GND. Is there something wrong with my setup ? When I use a DS18b20 with the example from the nodemcu firmware it works. What is also strange is the fact that after executing the dht22 script the esp8622 is no longer responding in the serial interface and has to be restarted.

Thomas

[javieryanez]

Hi Thomas,

You are using the latest version of the module? In the latest version (three days ago) on error humidity should the value -1.

I use the same connections, but without resistor.

What version of nodemcu you use ?, I've tried with 20140108

Regards,

Javier

[jescarri]

I made a pull request to solve this. https://github.com/javieryanez/nodemcu-modules/pull/4 It seems that the DHT wasn't being initialized in the correct way. http://playground.arduino.cc/Main/DHTLib

Gracias por compartir la libreria!.

[javieryanez]

Hi Jesus,

thanks for your help in the library. Lately I could not spend time in nodemcu. I accepted the request pull without checking, I trust you.

Espero poder encontrar tiempo para retomar el tema!

[jescarri]

Hey Javier, I'm new to nodemcu, ').

Espero funcione bien. Saludos!

[rosch85]

Hi Javier,

i'm having the same problem as described here. Do you have any further advice that might help?

Cheers, Sebastian

[jescarri]

Hey rosch85 DHT support has been added to nodemcu firmware, there is no need for any external dependency. https://github.com/jescarri/nodemcu-dht22-mqtt check that code, is using that functionality, also please beware that the DHT power is connected to a NodeMCU pin, and is powered on the fly.

Hope it helps.