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Add 'hdmi_cec' component, to interact with hdmi devices #5028

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@JosVanEijndhoven JosVanEijndhoven commented Jun 23, 2025

Description:

This component allows to connect an esphome device to the 'HDMI CEC' control bus.
On that bus, it can issue and receive commands to/from the HDMI-connected cluster of devices.
This includes commands to power devices on or off, adjust volume, select A/V inputs, etc.

Related issue (if applicable): fixes

Earlier versions of this component suffered from long run-times per loop invocation.
This is solved by the optional use of a UART.
To better show how to use this, two pictures with schematics are added.

Pull request in esphome with YAML changes (if applicable):

Checklist:

  • [*] I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
    or

  • I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

  • [*] Link added in /components/index.rst when creating new documents for new components or cookbook.

@probot-esphome probot-esphome bot added the next label Jun 23, 2025
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