esphome-docs/devices/sonoff_4ch.yaml

esphome:
  name: <NAME_OF_NODE>
  platform: ESP8266
  board: esp01_1m

wifi:
  ssid: <YOUR_SSID>
  password: <YOUR_PASSWORD>

api:

logger:

ota:

binary_sensor:
- platform: gpio
  pin:
    number: GPIO0
    mode:
      input: true
      pullup: true
    inverted: true
  name: "Sonoff 4CH Button 1"
  on_press:
    - switch.toggle: relay_1
- platform: gpio
  pin:
    number: GPIO9
    mode:
      input: true
      pullup: true
    inverted: true
  name: "Sonoff 4CH Button 2"
  on_press:
    - switch.toggle: relay_2
- platform: gpio
  pin:
    number: GPIO10
    mode:
      input: true
      pullup: true
    inverted: true
  name: "Sonoff 4CH Button 3"
  on_press:
    - switch.toggle: relay_3
- platform: gpio
  pin:
    number: GPIO14
    mode:
      input: true
      pullup: true
    inverted: true
  name: "Sonoff 4CH Button 4"
  on_press:
    - switch.toggle: relay_4
- platform: status
  name: "Sonoff 4CH Status"

switch:
- platform: gpio
  name: "Sonoff 4CH Relay 1"
  pin: GPIO12
  id: relay_1
- platform: gpio
  name: "Sonoff 4CH Relay 2"
  pin: GPIO5
  id: relay_2
- platform: gpio
  name: "Sonoff 4CH Relay 3"
  pin: GPIO4
  id: relay_3
- platform: gpio
  name: "Sonoff 4CH Relay 4"
  pin: GPIO15
  id: relay_4

output:
- platform: esp8266_pwm
  id: blue_led
  pin: GPIO13
  inverted: true

light:
- platform: monochromatic
  name: "Sonoff 4CH Blue LED"
  output: blue_led