Can not link monochromatic light to custom i2c ac-dimmer

Configuration
1

I have got a 4 Channel AC Dimmer with I2C interface at 8266 (different versions). Every part works.
Now I want to link all together and integrate it to Home Assistant.
I want to have 4 monochromatic lights in Home Assistant (because of 4 channels of dimmer), which sends data from Home Assistant to the dimmer via ESPhome via I2C.
It is very simple to set by 3 byte: I2C-Address, Channel-Address, Dimmer value (100 to 0, 100 = dark, 0 = bright).
I do not know, how to configure the i2c output.

esphome:
  name: ac_dimmer
  platform: ESP8266
  board: nodemcuv2
    
wifi:
  ssid: "FRITZ!Box 7490"
  password: "..."

captive_portal:

# Enable logging
logger:

# Enable Home Assistant API
api:

ota:

i2c:
  sda: D2
  scl: D1
  scan: True

light:
  - platform: monochromatic
    name: "Kitchen Lights"
    output: myI2C

output: 
  - platform: ???
    id: myI2C

If there is anywhere a tutorial or a video, on how to learn and understand about that theme, please point me in the right direction.

Thank you in advance
Christian

2

Hello @MrChristian

Did you ever find an solution for this? I have just bought the same dimmer.

3

I did a part.
my_custom_i2c.h

#include "esphome.h"

class MyCustomI2c : public Component, public FloatOutput {
  public:
  
	void setup() override {
		Wire.begin();
	}

	void write_state(float state) override {
		// delay(1000);
		int chan = id(channel);
		int i2c_state = 100 - int(state * 100);
		ESP_LOGD("custom", "The value of chan is: %x", chan);
		ESP_LOGD("custom", "The value of state is: %f", state);
		ESP_LOGD("custom", "The value of i2c state is: %d", i2c_state);
		Wire.beginTransmission(0x23); //address of MCP23017
        Wire.write(chan); // port a
        Wire.write(i2c_state); // write all pins high
		Wire.endTransmission();
	}
};

You can use the log or comment it out.
The ac_dimmer.yaml

esphome:
  name: ac_dimmer
  platform: ESP8266
  board: nodemcuv2
  includes:
    - my_custom_i2c.h

wifi:
  ssid: "FRITZ!Box 7490"
  password: "my password"

captive_portal:

# Enable logging
logger:
  esp8266_store_log_strings_in_flash: false

# Enable Home Assistant API
api:

ota:

i2c: 
    frequency: 100
    sda: D2
    scl: D1
    scan: True

globals: 
  - id: channel
    type: int
    # initial_value works. you can see it in the logs
    # initial_value: '0x82' 

output:
  - platform: custom
    type: float
    outputs:
      id: custom_i2c_output
    lambda: |-
      auto mycustomi2c = new MyCustomI2c();
      App.register_component(mycustomi2c);
      return {mycustomi2c};

light:
  - platform: monochromatic
    name: "Kitchen Light 1"
    id: "kl1"
    output: custom_i2c_output
    on_turn_on: 
    - logger.log: "Reached 1 on"
    - globals.set:
        id: channel
        value: '0x80'
    - logger.log: 
        format: "The channel value is %x"
        args: [ 'id(channel)' ]

    on_turn_off:
    - logger.log: "Reached 1 off"
    - globals.set:
        id: channel
        value: '0x80'
    - logger.log: 
        format: "The channel value is %x"
        args: [ 'id(channel)' ]

# this repeats 3 times for every light.
  - platform: monochromatic
    name: "Kitchen Light 2"
    id: "kl2"
    output: custom_i2c_output
    on_turn_on: 
    - logger.log: "Reached 2 on"
    - globals.set: 
        id: channel
        value: '0x81'
    - logger.log: 
        format: "The channel value is %x"
        args: [ 'id(channel)' ]
        
    on_turn_off: 
    - logger.log: "Reached 2 off"
    - globals.set: 
        id: channel
        value: '0x81'
    - logger.log: 
        format: "The channel value is %x"
        args: [ 'id(channel)' ]

# and so on...

It is working! You can remove all that logger stuff. It’s only for me to understand what’s happening.
But: It only works for ON and OFF. You can dim. But only the last channel that was switched on or off. light does not have a on_state_changed. The globals.set action will only touched on on_turn_on / on_turn_off .
I am a greenhorn in HA and ESPHome. At the very beginning. If you can make it work, write!
On next step I will try to control via MQTT.