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82 lines
3.0 KiB
ReStructuredText
82 lines
3.0 KiB
ReStructuredText
SHT3X-D Temperature+Humidity Sensor
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===================================
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.. seo::
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:description: Instructions for setting up SHT31-D/SHT3x and SHT85 temperature and humidity sensors
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:image: sht3xd.jpg
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The ``sht3xd`` sensor platform Temperature+Humidity sensor allows you to use your Sensirion SHT31-D/SHT3x
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(`datasheet <https://cdn-shop.adafruit.com/product-files/2857/Sensirion_Humidity_SHT3x_Datasheet_digital-767294.pdf>`__,
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`Adafruit`_ ) and SHT85 (`datasheet <https://sensirion.com/media/documents/4B40CEF3/640B2346/Sensirion_Humidity_Sensors_SHT85_Datasheet.pdf>`__,
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`Sensirion`_ ) sensors with Esphome.
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The :ref:`I²C Bus <i2c>` is required to be set up in your configuration for this sensor to work.
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.. _Adafruit: https://www.adafruit.com/product/2857
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.. _Sensirion: https://sensirion.com/products/catalog/SHT85/
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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: sht3xd
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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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address: 0x44
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update_interval: 60s
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Configuration variables:
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------------------------
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- **temperature** (*Optional*): The information for the temperature sensor.
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- All options from :ref:`Sensor <config-sensor>`.
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- **humidity** (*Optional*): The information for the humidity sensor.
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- All options from :ref:`Sensor <config-sensor>`.
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- **address** (*Optional*, int): Manually specify the I²C address of the sensor.
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Defaults to ``0x44``. For SHT3x, an alternate address can be ``0x45`` while SHT85 supports only address ``0x44``
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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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- **heater_enabled** (*Optional*, bool): Turn on/off heater at boot.
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This may help provide `more accurate readings in condensing conditions <https://forum.arduino.cc/t/atmospheric-sensors-in-condensing-conditions/412167>`_,
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but can also increase temperature readings and decrease humidity readings as a side effect.
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Defaults to ``false``.
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I²C Configuration when using Higher I²C Frequencies
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---------------------------------------------------
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When using the **IDF framework** and **I²C frequencies greater than 50-100kHz**, the I²C configuration needs to include a **timeout** option.
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On an ESP32, the Arduino framework has a default I²C timeout of 50ms whereas on IDF framework, the default timeout is 100us.
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At these higher I²C frequencies, the default I²C timeout on IDF framework causes a "Communication with SHT3xD failed" error on setup.
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A solution that has been tested on ESP32 at 800kHz, is to increase the I²C timeout to 10ms as per the following example.
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.. code-block:: yaml
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# Example I²C configuration
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i2c:
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sda: 21
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scl: 22
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scan: true
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frequency: 800khz
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timeout: 10ms
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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:`dht`
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- :doc:`dht12`
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- :doc:`hdc1080`
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- :doc:`htu21d`
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- :apiref:`sht3xd/sht3xd.h`
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- :ghedit:`Edit`
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