jeffd:
Has to be portable, its for a music box. The current is cut as soon as the lid is shut so the circuits will never be on for long periods of time. 9Vs should do the job just fine, but I needed to know if this wiring will achieve what I'm trying to accomplish here.
Well if I was going to do it that way, I would common all the battery negatives together and have the switch break the common ground going to each of the arduino boards, then run seperate positive wires from each battery positive to each arduino Vin pin.
Lefty