how to use KC868-AK programmable keyboard
Hardware connection of KC868-AK ESP32 programmable keyboard: You can use 1-35 buttons for defined actions. You can use 1-36 terminal ports with extend momentary wall switch, extend cable MAX 1000 meter. Connect with relay controller by RS232 or RS485 cable. here is typical case KC868-AK work with KC868-H32B Pro smart relay controller and contact diagram:…