I recently got all the parts for the robot in the mail, and I am about to start building. I figured to make the circuit
board first so I can really see how big it will be for the chassis, and my question is about the power circuits.
First in the tutorial, what I understand is you can choose either a battery pack (which I have, 6v/2300mAh) OR the plastic AA battery case. I also read the Batteries section, which says you should always have a separate power circuit for servos and control circuitry.. So which way is the way to go? Also there was a forum link from the tutorial to a post (lost the link) where the poster attached a layered schematic (50$ robot.pdf). I will attach this here again for anyone who hasn't seen the original post. In this schematic, it calls for attaching a 9v battery (which seems like it could be less as long as it doesnt dip below 6ish) to the 5v voltage regulator, and a 4xAA battery pack is used as well. The regulated 5v goes to the electronics, but the ground wire from the regulator goes to the servo "power grid". The positive lead from the 4xAA battery pack goes to the servo power grid, and the negative goes to the electronics. Shouldn't the ground wires be reversed?
So my question is basically how do I correctly wire the power circuit(s)?