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92 lines
2.6 KiB
ReStructuredText
92 lines
2.6 KiB
ReStructuredText
Template Sensor
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===============
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.. seo::
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:description: Instructions for setting up template sensors with ESPHome.
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:image: description.svg
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The ``template`` sensor platform allows you to create a sensor with templated values
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using :ref:`lambdas <config-lambda>`.
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.. code-block:: yaml
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# Example configuration entry
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sensor:
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- platform: template
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name: "Template Sensor"
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lambda: |-
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if (id(some_binary_sensor).state) {
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return 42.0;
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} else {
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return 0.0;
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}
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update_interval: 60s
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Possible return values for the lambda:
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- ``return <FLOATING_POINT_NUMBER>;`` the new value for the sensor.
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- ``return NAN;`` if the state should be considered invalid to indicate an error (advanced).
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- ``return {};`` if you don't want to publish a new state (advanced).
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Configuration variables:
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------------------------
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- **name** (**Required**, string): The name of the sensor.
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- **lambda** (*Optional*, :ref:`lambda <config-lambda>`):
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Lambda to be evaluated every update interval to get the new value of the sensor
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- **update_interval** (*Optional*, :ref:`config-time`): The interval to publish the value of the
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sensor, either the result of the lambda function or if no lambda function the last value
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published using the publish action. Set to ``never`` to disable updates. Defaults to ``60s``.
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
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- All other options from :ref:`Sensor <config-sensor>`.
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.. _sensor-template-publish_action:
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``sensor.template.publish`` Action
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----------------------------------
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You can also publish a state to a template sensor from elsewhere in your YAML file
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with the ``sensor.template.publish`` action.
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.. code-block:: yaml
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# Example configuration entry
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sensor:
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- platform: template
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name: "Template Sensor"
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id: template_sens
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# in some trigger
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on_...:
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- sensor.template.publish:
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id: template_sens
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state: 42.0
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# Templated
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- sensor.template.publish:
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id: template_sens
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state: !lambda 'return 42.0;'
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Configuration options:
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- **id** (**Required**, :ref:`config-id`): The ID of the template sensor.
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- **state** (**Required**, float, :ref:`templatable <config-templatable>`):
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The state to publish.
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.. note::
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This action can also be written in lambdas:
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.. code-block:: cpp
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id(template_sens).publish_state(42.0);
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See Also
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--------
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- :ref:`sensor-filters`
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- :ref:`automation`
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- :apiref:`template/sensor/template_sensor.h`
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- :ghedit:`Edit`
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