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DHT Temperature+Humidity Sensor
===============================
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.. seo ::
:description: Instructions for setting up DHT11 and DHT22 temperature and humidity sensors.
:image: dht.jpg
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:keywords: DHT11, DHT21, DHT22, AMS2301, AM2302, RHT03, SI7021
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The DHT Temperature+Humidity sensor allows you to use your
- DHT11 (`datasheet <https://akizukidenshi.com/download/ds/aosong/DHT11.pdf> `__ , `Adafruit <https://www.adafruit.com/product/386> `__ ),
- DHT21/DHT22 (`datasheet <https://www.sparkfun.com/datasheets/Sensors/Temperature/DHT22.pdf> `__ , `Adafruit <https://www.adafruit.com/product/385> `__ ),
- AMS2301/AM2302 (`datasheet <https://cdn-shop.adafruit.com/datasheets/Digital+humidity+and+temperature+sensor+AM2302.pdf> `__ , `Adafruit <https://www.adafruit.com/product/393> `__ ),
- RHT03 (`datasheet <https://cdn.sparkfun.com/datasheets/Sensors/Weather/RHT03.pdf> `__ , `SparkFun <https://cdn.sparkfun.com/datasheets/Sensors/Weather/RHT03.pdf> `__ ) and
- SI7021 (one wire Sonoff version) (`datasheet <https://cdn.sparkfun.com/assets/b/1/b/8/5/Si7021-A20.pdf> `__ , `SparkFun <https://cdn.sparkfun.com/assets/b/1/b/8/5/Si7021-A20.pdf> `__ )
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sensors with ESPHome.
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.. figure :: images/dht-full.jpg
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:align: center
:width: 50.0%
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DHT22 Temperature & Humidity Sensor.
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.. _Adafruit: https://www.adafruit.com/product/385
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The DHT22 and DHT11 require external pull up resistors on the data line. To do this, solder
a resistor with *about* 4.7kΩ (anything in the range from 1kΩ to 10kΩ probably works fine, but
if you're having issues try the 4.7kΩ recommended by the manufacturer) between `` DATA `` and `` 3.3V `` .
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.. figure :: images/temperature-humidity.png
:align: center
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:width: 80.0%
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.. code-block :: yaml
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# Example configuration entry
sensor:
- platform: dht
pin: D2
temperature:
name: "Living Room Temperature"
humidity:
name: "Living Room Humidity"
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update_interval: 60s
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Configuration variables:
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------------------------
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- **pin** (**Required** , :ref: `config-pin` ): The pin where the DHT bus is connected.
- **temperature** (**Required** ): The information for the temperature sensor.
- **name** (**Required** , string): The name for the temperature sensor.
- **id** (*Optional* , :ref: `config-id` ): Set the ID of this sensor for use in lambdas.
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- All other options from :ref: `Sensor <config-sensor>` .
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- **humidity** (**Required** ): The information for the humidity sensor
- **name** (**Required** , string): The name for the humidity sensor.
- **id** (*Optional* , :ref: `config-id` ): Set the ID of this sensor for use in lambdas.
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- All other options from :ref: `Sensor <config-sensor>` .
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- **model** (*Optional* , int): Manually specify the DHT model, can be
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one of `` AUTO_DETECT `` , `` DHT11 `` , `` DHT22 `` , `` DHT22_TYPE2 `` , `` AM2302 `` , `` RHT03 `` , `` SI7021 ``
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and helps with some connection issues. Defaults to `` AUTO_DETECT `` . Auto detection doesn't work for the SI7021 chip.
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- **update_interval** (*Optional* , :ref: `config-time` ): The interval to check the
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sensor. Defaults to `` 60s `` .
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.. note ::
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If you're seeing lots of invalid temperature/humidity warnings in the logs, try manually setting the
DHT model with the `` model: `` configuration variable. Other problems could be wrong pull-up resistor values
on the DATA pin or too long cables.
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Also, the default `` accuracy_decimals `` value of the humidity levels is set to 0, as the DHT11 for which this was originally written does not have a higher resolution. All other DHT sensors have a higher resolution, and thus should be configured with `` accuracy_decimals: 1 `` .
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See Also
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--------
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- :ref: `sensor-filters`
- :doc: `dht12`
- :doc: `hdc1080`
- :doc: `htu21d`
- :doc: `sht3xd`
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- :apiref: `dht/dht.h`
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- `Arduino DHTLib <https://playground.arduino.cc/Main/DHTLib> `__
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- :ghedit: `Edit`