mirror of
https://github.com/esphome/esphome-docs.git
synced 2024-12-27 17:37:45 +01:00
58 lines
2.3 KiB
ReStructuredText
58 lines
2.3 KiB
ReStructuredText
Absolute Humidity
|
|
=================
|
|
|
|
.. seo::
|
|
:description: Instructions for setting up absolute humidity calculation
|
|
:image: water-drop.svg
|
|
|
|
The ``absolute_humidity`` platform allows you to calculate absolute humidity from air temperature and relative humidity.
|
|
|
|
See the links at the bottom of the page for details on absolute humidity and the different saturated vapor pressure equations.
|
|
|
|
.. code-block:: yaml
|
|
|
|
# Example configuration entry
|
|
sensor:
|
|
- platform: absolute_humidity
|
|
name: Absolute Humidity
|
|
temperature: air_temperature
|
|
humidity: relative_humidity
|
|
|
|
# Use any temperature and relative humidity source, e.g. a BME280:
|
|
- platform: ...
|
|
temperature:
|
|
name: Temperature
|
|
id: air_temperature
|
|
humidity:
|
|
name: Relative Humidity
|
|
id: relative_humidity
|
|
|
|
Configuration variables:
|
|
------------------------
|
|
|
|
- **temperature** (**Required**, :ref:`config-id`): The sensor that is used to measure the current temperature, in °C.
|
|
- **humidity** (**Required**, :ref:`config-id`): The sensor that is used to measure the current relative humidity, in %.
|
|
- **equation** (*Optional*): The saturated vapor pressure equation to use (see below).
|
|
- All other options from :ref:`Sensor <config-sensor>`.
|
|
|
|
Saturated vapor pressure equations
|
|
----------------------------------
|
|
|
|
There are several different equations for calculating saturated vapor pressure.
|
|
``Wobus`` is used by default, as it is notionally the most accurate, but any of the following can be used:
|
|
|
|
- ``Buck``: `Arden Buck equation <https://en.wikipedia.org/wiki/Arden_Buck_equation>`__
|
|
- ``Tetens``: `Tetens equation <https://en.wikipedia.org/wiki/Tetens_equation>`__
|
|
- ``Wobus``: `Wobus equation <https://wahiduddin.net/calc/density_altitude.htm>`__
|
|
|
|
See Also
|
|
--------
|
|
|
|
- :ref:`sensor-filters`
|
|
- :apiref:`absolute_humidity/absolute_humidity.h`
|
|
- `NOAA Discussion on Humidity <https://www.weather.gov/lmk/humidity>`__
|
|
- `Absolute humidity on Wikipedia <https://en.wikipedia.org/wiki/Humidity#Absolute_humidity>`__
|
|
- `How to calculate absolute humidity <https://www.environmentalbiophysics.org/chalk-talk-how-to-calculate-absolute-humidity/>`__
|
|
- `How to convert relative humidity to absolute humidity <https://carnotcycle.wordpress.com/2012/08/04/how-to-convert-relative-humidity-to-absolute-humidity/>`__
|
|
- :ghedit:`Edit`
|