KC868-A6 - how to connect an optocoupler

[itpraktyk]

Hi!

I would like connect to the KC868-A6-V1.4SP an optocoupler - similar to https://pl.aliexpress.com/item/1005008446930626.html . My goal is to detect and react for switching 230V power in monitored circuit.

I flashed the KC868-A6 board with ESPHome - for now with default configuration.

Can someone help me understand
- from which pin should I take a power source for low voltage optocoupler side 
- where to connect its output to the KC868-A6 board
- what I have to add to the ESPHome configuraiton?

Thank you in advance.

[admin]

find a dry contact signal output module, connect to KC868-A6's digital input port.