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developers.home-assistant/docs/entity_sensor.md
cdce8p b45b3bf545 Added light 'device_class' for sensors (#10) 
* Added light 'device_class'

* Removed lux

* Changed device_class name
2018-05-05 09:38:54 -04:00

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Sensor Entity Sensor

A sensor is a read-only entity that provides some information. Information has a value and optionally, a unit of measurement.

Properties

Properties should always only return information from memory and not do I/O (like network requests). Implement update() or async_update() to fetch data.

Name Type Default Description
state string Required The value of the sensor.
unit_of_measurement string None The unit of measurement that the sensor is expressed in.
device_class string None Type of sensor.

Available device classes

If specifying a device class, your sensor entity will need to also return the correct unit of measurement.

Type Unit Description
battery % % of battery that is left.
humidity % % of humidity in the air.
illuminance lx/lm Light level.
temperature C/F Temperature.