I am building a multi-fan cooling system that needs to switch on and off manually. It will be mounted inside/on a paintball helmet that has been modified to hold all the housings. Fans are 30mmx30mmx8mm (from adafruit designed for raspberry pi).
I don't need much in terms of processing I simply need to know the circuitry necessary to run 10 (5v .2 amp) fans off of a single control unit and battery pack and keep current flow to all units below 5.5v.
The fans will run in parallel (I believe) and need a battery pack. I can build the unit housing around the type and number of batteries it will require, but I'm unsure of how to best set it up to get a decent run time. Matches can be from 45-90 minutes.
I plan to use and Arduino mini if necessary, but i think i can do this with a simple circuit board.