DHT Temperature+Humidity Sensor
===============================

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>`__), DHT22
(`datasheet <https://www.sparkfun.com/datasheets/Sensors/Temperature/DHT22.pdf>`__,
`adafruit <https://www.adafruit.com/product/385>`__), AM2302
(`datasheet <https://cdn-shop.adafruit.com/datasheets/Digital+humidity+and+temperature+sensor+AM2302.pdf>`__,
`adafruit <https://www.adafruit.com/product/393>`__) and RHT03
(`datashet <https://cdn.sparkfun.com/datasheets/Sensors/Weather/RHT03.pdf>`__,
`sparkfun <https://cdn.sparkfun.com/datasheets/Sensors/Weather/RHT03.pdf>`__)
sensors with esphomelib.

.. figure:: images/dht-full.jpg
    :align: center
    :width: 50.0%

    DHT22 Temperature & Humidity Sensor.

.. _Adafruit: https://www.adafruit.com/product/385

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``.

.. figure:: images/temperature-humidity.png
    :align: center
    :width: 80.0%

.. code:: yaml

    # Example configuration entry
    sensor:
      - platform: dht
        pin: D2
        temperature:
          name: "Living Room Temperature"
        humidity:
          name: "Living Room Humidity"
        update_interval: 15s

Configuration variables:
------------------------

- **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.
  - All other options from :ref:`Sensor <config-sensor>` and :ref:`MQTT Component <config-mqtt-component>`.

- **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.
  - All other options from :ref:`Sensor <config-sensor>` and :ref:`MQTT Component <config-mqtt-component>`.

- **model** (*Optional*, int): Manually specify the DHT model, can be
  one of ``AUTO_DETECT``, ``DHT11``, ``DHT22``, ``AM2302``, ``RHT03``
  and helps with some connection issues. Defaults to ``AUTO_DETECT``.
- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the
  sensor. Defaults to ``15s``. See :ref:`sensor-default_filter`.

.. note::

   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.

See Also
--------

- :ref:`sensor-filters`
- :doc:`dht12`
- :doc:`hdc1080`
- :doc:`htu21d`
- :doc:`sht3xd`
- :doc:`API Reference </api/sensor/dht>`
- `Arduino DHTLib <https://playground.arduino.cc/Main/DHTLib>`__
- `Edit this page on GitHub <https://github.com/OttoWinter/esphomedocs/blob/current/esphomeyaml/components/sensor/dht.rst>`__