esphome-docs/esphomeyaml/components/sensor/template.rst

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Template Sensor
===============
The ``template`` sensor platform allows you to create a sensor with templated values
using :ref:`lambdas <config-lambda>`.
.. code:: yaml
# Example configuration entry
sensor:
- platform: template
name: "Template Sensor"
lambda: >-
if (id(some_binary_sensor).value) {
return 42.0;
} else {
return 0.0;
}
update_interval: 15s
Possible return values for the lambda:
- ``return <FLOATING_POINT_NUMBER>;`` the new value for the sensor.
- ``return NAN;`` if the state should be considered invalid to indicate an error (advanced).
- ``return {};`` if you don't want to publish a new state (advanced).
Configuration variables:
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------------------------
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- **name** (**Required**, string): The name of the binary sensor.
- **lambda** (*Optional*, :ref:`lambda <config-lambda>`):
Lambda to be evaluated every update interval to get the new value of the sensor
- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the
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sensor. Defaults to ``15s``. See :ref:`sensor-default_filter`.
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- **id** (*Optional*,:ref:`config-id`): Manually specify the ID used for code generation.
- All other options from :ref:`Binary Sensor <config-binary_sensor>` and :ref:`MQTT Component <config-mqtt-component>`.
See Also
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--------
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- :ref:`sensor-filters`
- :ref:`automation`
- :doc:`API Reference </api/sensor/template>`
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- `Edit this page on GitHub <https://github.com/OttoWinter/esphomedocs/blob/current/esphomeyaml/components/sensor/template.rst>`__
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.. disqus::