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KC868-A16 Rev V1.6: Second PCF8574 Inputs/Outputs Not Working - Printable Version

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+--- Thread: KC868-A16 Rev V1.6: Second PCF8574 Inputs/Outputs Not Working (/showthread.php?tid=8636)

KC868-A16 Rev V1.6: Second PCF8574 Inputs/Outputs Not Working - mohaz - 10-09-2025

Dear Support Team,
I recently purchased another KC868-A16 (Revision V1.6). After successfully flashing it with ESPHome, LAN communication is working correctly, and the first 8 inputs/outputs function as expected.
However, the second set of 8 inputs/outputs is not responding. The 12V power supply is connected to the second output slot, and the N line is connected to the second input slot, but the LEDs remain off even when toggled via the web interface.
Below is my PCF8574 configuration, which works properly with my previous A16 units:
Code:
pcf8574:
  - id: 'pcf8574_hub_output'
    address: 0x24
  - id: 'pcf8574_hub_output_2'
    address: 0x25
  - id: 'pcf8574_hub_input'
    address: 0x22
  - id: 'pcf8574_hub_input_2'
    address: 0x21

switch:
  - platform: gpio
    name: "Test_1-8_OK"
    id: switch7
    pin:
      pcf8574: pcf8574_hub_output
      # Use pin number 0
      number: 6
      # One of INPUT or OUTPUT
      mode: OUTPUT
      inverted: true
  - platform: gpio
    name: "Test_9-16_Fail"
    id: switch9
    pin:
      pcf8574: pcf8574_hub_output_2
      # Use pin number 0
      number: 0
      # One of INPUT or OUTPUT
      mode: OUTPUT
      inverted: true
Could this issue be related to the I²C address configuration, or is there a known difference in hardware between revision V1.6 and earlier versions?
Thank you for your assistance.
Best regards,

RE: KC868-A16 Rev V1.6: Second PCF8574 Inputs/Outputs Not Working - admin - 10-09-2025

take a photo of your board, i want to see how you wire.
esphome yaml: https://www.kincony.com/forum/showthread.php?tid=1628

RE: KC868-A16 Rev V1.6: Second PCF8574 Inputs/Outputs Not Working - mohaz - 10-10-2025

(10-09-2025, 10:54 PM)admin Wrote: take a photo of your board, i want to see how you wire.
esphome yaml: https://www.kincony.com/forum/showthread.php?tid=1628

Hi,

After rechecking the board connections, I found that the pinout connector in the Output 2 slot was misplaced (shifted, as shown in the attached image) from its original position—likely due to an assembly error.

After replacing the connector, everything is now working correctly and the issue has been resolved.

Thank you for your support.

RE: KC868-A16 Rev V1.6: Second PCF8574 Inputs/Outputs Not Working - admin - 10-10-2025

ok, good.