example_fake_arc_device.yaml

# Creates a fake Audio Return Channel (ARC) device. This convinces some TVs (e.g. TCL)
# to send volume commands over HDMI-CEC.

esphome:
  name: cec
  platform: ESP8266
  board: d1_mini
  # Maybe necessary depending on what else you're running on the ESP chip.
  # The execution loop for hdmi_cec is somewhat timing sensitive.
  # platformio_options:
  #   board_build.f_cpu: 160000000L

logger:

external_components:
  - source: ./components

hdmi_cec:
  # The initial logical address -- corresponds to device type. This may be
  # reassigned if there are other devices of the same type on the CEC bus.
  address: 0x05 # Audio system
  # Promiscuous mode can be enabled to allow receiving messages not intended for us
  promiscuous_mode: false
  # Typically the physical address is discovered based on the point-to-point
  # topology of the HDMI connections using the DDC line. We don't have access
  # to that so we just hardcode a physical address.
  physical_address: 0x4000
  pin: 4 # GPIO4
  on_message:
    - opcode: 0xC3 # Request ARC start
      then:
        - hdmi_cec.send: # Report ARC started
            destination: 0x0
            data: [ 0xC1 ]
    - opcode: 0x70 # System audio mode request
      then:
        - hdmi_cec.send:
            destination: 0xF
            data: [ 0x72, 0x01 ]
    - opcode: 0x71 # Give audio status
      then:
        - hdmi_cec.send:
            destination: 0x0
            data: [ 0x7A, 0x7F ]
    - opcode: 0x7D # Give audio system mode status
      then:
        - hdmi_cec.send:
            destination: 0x0
            data: [ 0x7E, 0x01 ]
    - opcode: 0x46 # Give OSD name
      then:
        - hdmi_cec.send:
            destination: 0x0
            data: [0x47, 0x65, 0x73, 0x70, 0x68, 0x6F, 0x6D, 0x65] # esphome
    - opcode: 0x8C # Give device Vendor ID
      then:
        - hdmi_cec.send:
            destination: 0x0
            data: [0x87, 0x00, 0x13, 0x37]
    - data: [0x44, 0x41] # User control pressed: volume up
      then:
        - logger.log: "Volume up"
    - data: [0x44, 0x42] # User control pressed: volume down
      then:
        - logger.log: "Volume down"
    - data: [0x44, 0x43] # User control pressed: volume mute
      then:
        - logger.log: "Volume mute"