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2.4 KiB
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59 lines
2.4 KiB
ReStructuredText
Absolute Humidity
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=================
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.. seo::
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:description: Instructions for setting up absolute humidity calculation
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:image: water-drop.svg
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The ``absolute_humidity`` platform allows you to calculate absolute humidity from air temperature and relative humidity.
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See the links at the bottom of the page for details on absolute humidity and the different saturated vapor pressure equations.
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.. code-block:: yaml
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# Example configuration entry
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sensor:
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- platform: absolute_humidity
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name: Absolute Humidity
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temperature: air_temperature
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humidity: relative_humidity
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# Use any temperature and relative humidity source, e.g. a BME280:
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- platform: ...
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temperature:
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name: Temperature
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id: air_temperature
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humidity:
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name: Relative Humidity
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id: relative_humidity
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Configuration variables:
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------------------------
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- **name** (**Required**, string): The name for the absolute humidity sensor.
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- **temperature** (**Required**, :ref:`config-id`): The sensor that is used to measure the current temperature, in °C.
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- **humidity** (**Required**, :ref:`config-id`): The sensor that is used to measure the current relative humidity, in %.
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- **equation** (*Optional*): The saturated vapor pressure equation to use (see below).
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- All other options from :ref:`Sensor <config-sensor>`.
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Saturated vapor pressure equations
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----------------------------------
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There are several different equations for calculating saturated vapor pressure.
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``Wobus`` is used by default, as it is notionally the most accurate, but any of the following can be used:
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- ``Buck``: `Arden Buck equation <https://en.wikipedia.org/wiki/Arden_Buck_equation>`__
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- ``Tetens``: `Tetens equation <https://en.wikipedia.org/wiki/Tetens_equation>`__
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- ``Wobus``: `Wobus equation <https://wahiduddin.net/calc/density_altitude.htm>`__
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See Also
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--------
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- :ref:`sensor-filters`
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- :apiref:`absolute_humidity/absolute_humidity.h`
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- `NOAA Discussion on Humidity <https://www.weather.gov/lmk/humidity>`__
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- `Absolute humidity on Wikipedia <https://en.wikipedia.org/wiki/Humidity#Absolute_humidity>`__
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- `How to calculate absolute humidity <https://www.environmentalbiophysics.org/chalk-talk-how-to-calculate-absolute-humidity/>`__
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- `How to convert relative humidity to absolute humidity <https://carnotcycle.wordpress.com/2012/08/04/how-to-convert-relative-humidity-to-absolute-humidity/>`__
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- :ghedit:`Edit`
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