add support for DHT21/AM2301

esphome / feature-requests

ESPHome Feature Request Tracker

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add support for DHT21/AM2301 #1534

Closed johnnychicago closed 2 years ago

johnnychicago commented 2 years ago

Describe the problem you have/What new integration you would like

The DHT21 sensor is not currently supported in esphome. It is a slightly chunkier 'outdoor' variant of the well supported DHT22, the hardware being packaged in a more useful way for mounting a device. It quotes AM2301 on the case. Not adding a link since I don't want to spam for vendors. Tasmota and similar support this.

Please describe your use case for this integration and alternatives you've tried:

I have tested a sensor, defined it in YAML as AUTO, as DHT22 and as all other options for model. Logfile clearly recognises there is a sensor, but can't speak to it.

Additional context

Here's hoping this thing is supported in underlying libraries and it would not be a major issue to activate support.

freezir12 commented 2 years ago

Yes support for DHT21 would be awesome!

vilnis-jaunais commented 2 years ago

Hoping on this as well!

theonteg commented 2 years ago

DHT21 is a very good solution for outdoor usage. Implementing it in ESPhome would be more than welcome

freezir12 commented 2 years ago

Dont know why but my ESP8266 with connected DHT21 started working with:

sensor:

platform: dht model: DHT22

Humidity and temp are read fine

ed-davies commented 2 years ago

Can confirm: an AM2301 seems to work fine with an ESP8266-based Sonoff TH16 and ESPHome 2022.2.5. Complete YAML stanza with faster-than-sensible updates just for my testing:

sensor:
  - platform: dht
    pin: GPIO14
    model: DHT22
    temperature:
      name: temperature
      accuracy_decimals: 1
    humidity:
      name: humidity
      accuracy_decimals: 1
    update_interval: 10s

sumirati commented 2 years ago

Created a PR to reflect the DHT21/AMS2301 as variants in the DHT documentation - https://github.com/esphome/esphome-docs/pull/2044

en-ver commented 2 years ago

Can't get it working either. Use it with nodeMCU

  - platform: dht
    pin: D7
    model: DHT22
    temperature:
      name: Roof Temp
      accuracy_decimals: 1
    humidity:
      name: Roof Humidity
      accuracy_decimals: 1
    update_interval: 10s

[10:34:36][W][dht:163]: Waiting for DHT communication to clear failed!
[10:34:36][W][dht:060]: Invalid readings! Please check your wiring (pull-up resistor, pin number).
[10:34:36][D][sensor:124]: 'Roof Temp': Sending state nan °C with 1 decimals of accuracy
[10:34:36][D][sensor:124]: 'Roof Humidity': Sending state nan % with 1 decimals of accuracy