Design and layout of a quadcopter control board (2012)

Very nice work. Funny how as I walked through your write up hit he DB-9 and thought 'overkill', then read the next paragraph to see the same word :)

What a pity about the V5/V6 issue, you're not the only person to be bitten by this:

http://www.rs-online.com/designspark/electronics/tutorial/im...

This is from 2012? It'd be neat to see some in depth follow ups on stuff like this. I'm just now going from proto boards to building schematics and boards, so seeing the evolution and thought process on projects like this can be pretty inspiring.