Smart Home Automation Forum

i2c:
  sda: 4  #replace by your board's pin define
  scl: 5   #replace by your board's pin define
  scan: true
  id: bus_a

pcf8574:
  - id: 'pcf8574_hub_out_1'  # for output channel 1-8
    address: 0x24    #replace by your PCF8574 address

switch:
  - platform: gpio
    name: "a8-light1"
    pin:
      pcf8574: pcf8574_hub_out_1
      number: 0
      mode: OUTPUT
      inverted: true

  - platform: gpio
    name: "a8-light2"
    pin:
      pcf8574: pcf8574_hub_out_1
      number: 1
      mode: OUTPUT
      inverted: true
     
  - platform: gpio
    name: "a8-light3"
    pin:
      pcf8574: pcf8574_hub_out_1
      number: 2
      mode: OUTPUT
      inverted: true
     
  - platform: gpio
    name: "a8-light4"
    pin:
      pcf8574: pcf8574_hub_out_1
      number: 3
      mode: OUTPUT
      inverted: true
     
  - platform: gpio
    name: "a8-light5"
    pin:
      pcf8574: pcf8574_hub_out_1
      number: 4
      mode: OUTPUT
      inverted: true
     
  - platform: gpio
    name: "a8-light6"
    pin:
      pcf8574: pcf8574_hub_out_1
      number: 5
      mode: OUTPUT
      inverted: true

  - platform: gpio
    name: "a8-light7"
    pin:
      pcf8574: pcf8574_hub_out_1
      number: 6
      mode: OUTPUT
      inverted: true
     
  - platform: gpio
    name: "a8-light8"
    pin:
      pcf8574: pcf8574_hub_out_1
      number: 7
      mode: OUTPUT
      inverted: true

download yaml demo for ESPHome:
[attachment=4329]

about A0,A1,A2 i2c address setting:
A0  A1  A2
0    0    0    =0x20
0    0    1    =0x21
0    1    0    =0x22
0    1    1    =0x23
1    0    0    =0x24
1    0    1    =0x25
1    1    0    =0x26
1    1    1    =0x27

but with this configuration (OUTPUT) it is not possible to intercept the relay status if operated manually!

BR
E.

yes, this manual control button use by phsical way, it work without software. Just used in emergency situations.

Is there a chance to connect IO expanders to ksc v3 firmware? To control them from your aplication? Idea is to connect your base board like b16 to loxone with that expanders

if you want extend by i2c device, you can use by ESPHome. such as DI8 i2c digital input module and DO8 i2c relay module.