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92 lines
3.8 KiB
ReStructuredText
92 lines
3.8 KiB
ReStructuredText
DHT Temperature+Humidity Sensor
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===============================
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.. seo::
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:description: Instructions for setting up DHT11 and DHT22 temperature and humidity sensors.
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: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
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- DHT11 (`datasheet <https://akizukidenshi.com/download/ds/aosong/DHT11.pdf>`__, `Adafruit <https://www.adafruit.com/product/386>`__),
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- DHT21/DHT22 (`datasheet <https://www.sparkfun.com/datasheets/Sensors/Temperature/DHT22.pdf>`__, `Adafruit <https://www.adafruit.com/product/385>`__),
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- AMS2301/AM2302 (`datasheet <https://cdn-shop.adafruit.com/datasheets/Digital+humidity+and+temperature+sensor+AM2302.pdf>`__, `Adafruit <https://www.adafruit.com/product/393>`__),
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- RHT03 (`datasheet <https://cdn.sparkfun.com/datasheets/Sensors/Weather/RHT03.pdf>`__, `SparkFun <https://cdn.sparkfun.com/datasheets/Sensors/Weather/RHT03.pdf>`__) and
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- 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
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: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
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a resistor with *about* 4.7kΩ (anything in the range from 1kΩ to 10kΩ probably works fine, but
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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
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:align: center
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:width: 80.0%
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.. code-block:: yaml
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# Example configuration entry
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sensor:
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- platform: dht
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pin: D2
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temperature:
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name: "Living Room Temperature"
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humidity:
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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.
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- **temperature** (**Required**): The information for the temperature sensor.
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- **name** (**Required**, string): The name for the temperature sensor.
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- **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
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- **name** (**Required**, string): The name for the humidity sensor.
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- **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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The default ``accuracy_decimals`` value of the *humidity* levels is ``0``, as the DHT11 for which this was
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originally written does not have a higher resolution. All other DHT sensors have a higher resolution, it's worth
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to configure them with ``accuracy_decimals: 1``.
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If you're seeing lots of invalid temperature/humidity warnings in the logs, try manually setting the
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DHT model with the ``model:`` configuration variable. Other problems could be wrong pull-up resistor values
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on the DATA pin or too long cables.
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See Also
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--------
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- :ref:`sensor-filters`
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- :doc:`absolute_humidity`
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- :doc:`dht12`
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- :doc:`hdc1080`
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- :doc:`htu21d`
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- :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`
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