esphome-docs/components/switch/uart.rst

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UART Switch
===========
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.. seo::
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:description: Instructions for setting up UART switches in ESPHome that can output arbitrary UART sequences when activated.
:image: uart.svg
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The ``uart`` switch platform allows you to send a pre-defined sequence of bytes on a
:doc:`UART bus </components/uart>` when triggered.
.. code-block:: yaml
# Example configuration entry
uart:
baud_rate: 9600
tx_pin: D0
switch:
- platform: uart
name: "UART String Output"
data: 'DataToSend'
- platform: uart
name: "UART Bytes Output"
data: [0xDE, 0xAD, 0xBE, 0xEF]
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- platform: uart
name: "UART Recurring Output"
data: [0xDE, 0xAD, 0xBE, 0xEF]
send_every: 1s
- platform: uart
name: "UART On/Off"
data:
turn_on: "TurnOn\r\n"
turn_off: "TurnOff\r\n"
Configuration variables:
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------------------------
- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
- **name** (*Optional*, string): The name for the switch.
- **uart_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the UART hub.
- **data** (*Optional*, string or list of bytes): The data to send via UART. Either an ASCII string
or a list of bytes or one or both of the following nested options (see example above).
- **turn_on** (*Optional*, string or list of bytes): The data to send when turning on.
- **turn_off** (*Optional*, string or list of bytes): The data to send when turning off.
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- **send_every** (*Optional*, :ref:`config-time`): Sends recurring data instead of sending once.
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- All other options from :ref:`Switch <config-switch>`.
See Also
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--------
- :doc:`/components/uart`
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- :apiref:`uart/switch/uart_switch.h`
- :ghedit:`Edit`