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Feature/heating si7021 (#3150)

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* update

* Update components/sensor/htu21d.rst

---------

Co-authored-by: Keith Burzinski <kbx81x@gmail.com>
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components/sensor/htu21d.rst
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@ -9,6 +9,7 @@ HTU21D | Si7021 | SHT21 Temperature & Humidity Sensor
The HTU21D Temperature & Humidity component allows you to use HTU21D, Si7021 and SHT21 sensors with
ESPHome. The :ref:`I²C Bus <i2c>` is required to be set up in your configuration for this sensor to work.
Example sensors:
- (`Adafruit <https://www.adafruit.com/product/1899>`__)
@ -34,6 +35,8 @@ Example sensors:
name: "Temperature"
humidity:
name: "Humidity"
heater:
name: "Heater"
Configuration variables:
------------------------
@ -44,8 +47,12 @@ Configuration variables:
- **humidity** (*Optional*): The information for the humidity sensor.
All options from :ref:`Sensor <config-sensor>`.
- **heater** (*Optional*): The information for the heater sensor.
All options from :ref:`Sensor <config-sensor>`.
- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the sensor. Defaults to ``60s``.
The heater may be enabled to help correct the reading; see the datasheet for more information.
See Also
--------