How good is the power regulation on a RPi 2 ?
I have a small robot controlled by an RPi2 and some Arduinos, and have two choices to power it (the Pi, that is). I can make a dedicated 5V regulated rail with a small 3A DC-DC converter, or I can feed the 7.4V from the batteries to the Pi. The batteries will have servos (via another regulator) running off them, possible not a real clean source, but maybe OK with the other 5V regulator for the servos there.
My other question is power related too. How can I stop the Pi from giving the Arduino power over USB? It really only needs to be a data connection and I'd rather supply the Arduinos off my own 5V rail than tax the Pi's USB.
Sorry about the two questions / post, they seem related.