esphome-docs/esphomeyaml/components/switch/template.rst
2018-08-24 22:44:01 +02:00

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Template Switch
===============
The ``template`` switch platform allows you to create simple switches out of just actions and
an optional value lambda. Once defined, it will automatically appear in Home Assistant
as a switch and can be controlled through the frontend.
.. code:: yaml
# Example configuration entry
switch:
- platform: template
name: "Template Switch"
lambda: >-
if (id(some_binary_sensor).value) {
return true;
} else {
return false;
}
turn_on_action:
- switch.turn_on:
id: switch2
turn_off_action:
- switch.turn_on:
id: switch1
optimistic: true
Possible return values for the optional lambda:
- ``return true;`` if the switch should be reported as ON.
- ``return false;`` if the switch should be reported as OFF.
- ``return {};`` if the last state should be repeated.
Configuration variables:
------------------------
- **name** (**Required**, string): The name of the switch.
- **lambda** (*Optional*, :ref:`lambda <config-lambda>`):
Lambda to be evaluated repeatedly to get the current state of the switch.
Only state *changes* will be published to MQTT.
- **optimistic** (*Optional*, boolean): Whether to operate in optimistic mode - when in this mode,
any command sent to the template cover will immediately update the reported state and no lambda
needs to be used. Defaults to ``false``.
- **turn_on_action** (*Optional*, :ref:`Action <config-action>`): The action that should
be performed when the remote (like Home Assistant's frontend) requests the switch to be turned on.
- **turn_off_action** (*Optional*, :ref:`Action <config-action>`): The action that should
be performed when the remote (like Home Assistant's frontend) requests the switch to be turned on.
- **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>`.
.. note::
esphomelib will automatically try to restore the last state from flash on boot, it will then also call
the turn on/off actions for you.
See Also
--------
- :doc:`/esphomeyaml/guides/automations`
- :doc:`/esphomeyaml/components/switch/index`
- :doc:`/esphomeyaml/components/binary_sensor/index`
- :doc:`API Reference </api/switch/template>`
- `Edit this page on GitHub <https://github.com/OttoWinter/esphomedocs/blob/current/esphomeyaml/components/switch/template.rst>`__