I am new to the forum and my knowledge of arduino is limited. (2 months )
I am connecting multiple uno boards on one mega over pcb board with for wires, some of wire will be shorted od PCB as i wont have enough pins on mega, as there are more stuff connected to. If I connect every pin individualy it would take 60 pins so this is not an option.
UNO 1 - PIN 3 OUTPUT-------
UNO 2 - PIN 3 OUTPUT---------PCB connected together-----MEGA PIN 4 INPUT (HIGH for 50ms)
UNO 3 - PIN 3 OUTPUT-------/
… (to 15)
MEGA should reset all UNO boards so one MEGA pin to ALL RESET pins on UNO boards (LOW 50ms signal to reset after will be HIGH so it doesnt reset anymore)
Every board would have it’s own power supply (as they are connected to 12 A, power supply with splitter.