I'm using a Mega since I picked it up for the same price as a Uno and, at the time, I knew absolutely nothing about the microcontrollers so I went for the one with "mega" in the name
This is the prototype, eventually I'm hoping to have a few pir bump sensors and a scanning ping sensor for room mapping. This is for my college FYP, I'm going to be using genetic algorithms via the Pi to develop pathfinding and mapping techniques for the robot. My hope is that if I use different layouts of "training rooms" from a fresh start then the robot will develop different path-finding techniques BUT that if I then go on to introduce these initial program runs to the other rooms that the majority of runs will come up with a similar algorithm in the end.
Back to the original reason I posted this question though - is my power circuit, as it is, badly laid out? Leaving aside the Pi powering argument - should there be some kind of cut-off in the common ground or a couple of diodes thrown in somewhere? I'm worried that I may be allowing a possible short-circuit somewhere but I don't have the electronics experience to spot it