Hi all, first post here. I've been trying to find the answer in other people's posts, but didn't quite get there, so here's my little scenario. I'm working on a project where the arduino NG controls a 12v dc motor (lots of pwm planned) and an array of 6 muscle wire "levers". I understand that I must use a separate power supply (plus transistor circuit) for the motor. I've been testing the lever array (without arduino) by running it through a voltage regulator 7905, which seems to work well. The motor and array are on the same power supply and seem to get along ok. My question is: once the arduino is part of the circuit, do I have to add transistors to all 6 of the levers as well? Or is the fact that the voltage that reaches them is harmless to the arduino makes it unnecessary? I can't imagine blow back is an issue with MW, right? Thank you in advance for any thought on this. This forum is always an inspiration.
Oh, I should mention as well that I'm using the ping sensor running right out of the arduino.