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+--- Thread: PCF8574 IO Expansion i2c relay board -DO8 ESPHome config yaml demo (/showthread.php?tid=4591)
PCF8574 IO Expansion i2c relay board -DO8 ESPHome config yaml demo - admin - 02-23-2024
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:
DO8_config_yaml.txt (Size: 1.58 KB / Downloads: 404)
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
RE: PCF8574 IO Expansion i2c relay board -DO8 ESPHome config yaml demo - montemartello - 07-16-2025
but with this configuration (OUTPUT) it is not possible to intercept the relay status if operated manually!
BR
E.
RE: PCF8574 IO Expansion i2c relay board -DO8 ESPHome config yaml demo - admin - 07-16-2025
yes, this manual control button use by phsical way, it work without software. Just used in emergency situations.
RE: PCF8574 IO Expansion i2c relay board -DO8 ESPHome config yaml demo - Krzysrok - 10-29-2025
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
RE: PCF8574 IO Expansion i2c relay board -DO8 ESPHome config yaml demo - admin - 10-29-2025
if you want extend by i2c device, you can use by ESPHome. such as DI8 i2c digital input module and DO8 i2c relay module.