I've finally got all the parts for a project and am going to begin wiring it together. I will have
--24 sharp GP2D12 infrared sensors, - drawing 5v --6 AC controller boards (from Futurlec - ET-OPTO AC-OUT4) - each drawing 5v
I'm trying to figure out how much current these will draw. From the spec in the Sharp sensor, it looks like the range for each is 33-50 mA - (x 24 = 1.2 A). I don't have a detailed spec for the AC boards- say it's about the same. (6 * 50mA = 300 mA) So 1.5 A total - or 2A to have some head room.
Is this too much current for the Arduino to source? If I go with a separate supply, will I still need to have a common ground with the Arduino for the sensors + AC boards to work correctly?
(I think the answers to both question == yes but wanted to get a reality check)