Hi there,
Thanks for the reply. I missed something in my previous message. The wire layout is already done, and there's no 220V wiring reaching the switches, only DC Cat-5 wire. To activate the power circuits manually I would need to set up another system with would be much more difficult to build than having two Arduinos working together. I have thought something like using logic gates at the exit of the Arduino's or using a three state buffer that in that case would be controlled manually. Is something like that what you suggest?
Thanks.