Very nice library, I'm glad someone refined the work from existing authors.

However, it's not working for me on seeed_xiao_esp32c3. It reports successfully transmitting frames in the logs, but on my logic analyzer I don't see the pin state change at all. I had the same issue with johnboiles library, and for the longest time, I thought the code just didn't work.

After discovering your library, and seeing that it still did not work for me, I decided to try it on a Waveshare ESP32-S3-Zero with esp32-s3-devkitc-1 and it works fine.

So I am a bit perplexed what is going on, I've double and triple checked my physical connections, verified the pins work by testing other output components the same pin, tried all the pins available on the board, and still no output.

My config is very simple to test:

esphome:
  name: basic

esp32:
  board: seeed_xiao_esp32c3
  framework:
    type: arduino
  # board: esp32-s3-devkitc-1 # Works for Waveshare ESP32-S3-Zero
  # framework:
  #   type: arduino

logger:

binary_sensor:
  - platform: gpio
    name: "CEC Send"
    pin:
      number: GPIO9 # Xiao onboard button    
      # number: GPIO0 # Waveshare ESP32-S3-Zero onboard button
      inverted: true
      mode: INPUT_PULLUP
    on_press:
      hdmi_cec.send:
        destination: 0xF # Broadcast
        data: [0x36] # "Standby" opcode                

external_components:
  - source: github://Palakis/esphome-hdmi-cec

hdmi_cec:
  pin: GPIO4
  address: 0x4
  physical_address: 0x1000

Everything seems to be fine in the logs:

[D][binary_sensor:036]: 'CEC Send': Sending state ON
[D][hdmi_cec:204]: sending frame: 4F:36
[D][hdmi_cec:218]: HDMICEC::send(): frame sent and acknowledged
[W][component:237]: Component gpio.binary_sensor took a long time for an operation (53 ms).
[W][component:238]: Components should block for at most 30 ms.
[D][binary_sensor:036]: 'CEC Send': Sending state OFF

But only my S3 will actually output data, the C3 just sits there and pretends to have done something with the line staying high.

In fact, if I put an external pulldown resistor, it actually does something, just junk on when the CEC send is invoked, but it actually does something. So I'm thinking there must be something off with the way the pin is being configured. I tried manually setting some of the pin configuration, like INPUT_OUTPUT_OPEN_DRAIN, etc. but it has no effect - except 'inverted' which results in the error "[E][hdmi_cec:232]: HDMICEC::send(): send failed after five attempts"

Thanks in advance for any pointers as to what may be going on.

Hello,

First of all thanks for this work !

I'm trying to get a Service in HomeAssistant. So i define this in esphome:

api:
  services:
    - service: hdmi_cec_send
      variables:
        cec_destination: int
        cec_data: int[]
      then:
        - hdmi_cec.send:
            destination: !lambda 'return cec_destination;'
            data: !lambda 'return cec_data;'

but i have this error :

<unicode string>:54:14: error: could not convert 'cec_data' from 'vector<int>' to 'vector<unsigned char>'

Any Idea how i can fix this ?

Hi,

First off LOVE THIS! after 2 months of screwing around with other options this one worked for me and saved my project!!!

Would it be possible to implement id in esphome. The reason is that I would love to use 3 HDMI CEC outputs.

Let me know hwo to buy you a coffee(tm) for all the hard work.

I have this simple code working and using HomeAssistant to send in...

cec_destination = 0
cec_data = [0x04]

...and its working to get the tv to turn on, but only when the tv is in standby mode. I'd really like to be able to turn the tv on from complete power-cycle as well. I only wired up 2 of the 3 (3rd was said to be optional) wires suggested in your readme. Perhaps 3 might work if the TV knows a device is there?

services:
    - service: hdmi_cec_send
      variables:
        cec_destination: int
        cec_data: int[]
      then:
        - hdmi_cec.send:
            destination: !lambda 'return static_cast<unsigned char>(cec_destination);'
            data: !lambda 'std::vector<unsigned char> charVector; for (int i : cec_data) { charVector.push_back(static_cast<unsigned char>(i)); } return charVector;'

I can't believe I've been all over the place and can't seem to find a "programmatic solution to turn the tv on and off that is as guaranteed as the IR/RF remote. I was really hoping CEC would be the answer. 😢