Hello and thanks in advance for any advice you can give!
I'm building a little remote controlled webcam + RC car project and would like to monitor the levels of two power systems. The first is a 5v USB power pack running the Raspberry Pi (which is in turn running the Arduino, wireless and camera) and servo, then a 9.6v RC battery pack running the wheel motor.
I think I have things mostly nailed down, I just have a couple of questions to make sure I don't blow anything up.
Question 1: Will tying the ground of both power systems together cause any system destroying issues? From what I've read it should be that way or the voltage readings to the Arduino will be wonky.
Question 2: Should I be slapping a diode from ground to the voltage reading analog inputs for protection?
*edit: oops, re-uploaded a smaller image, my bad.