Hi all,   I have been assembling and building a quad since a few months back and using resources from DIY Drones and the Arducopter project. Have a working and flying (not very stable) quad right now! Many thanks to the Dev team!   My question: If I want to add other types of analog sensors (ultrasonic or IR), I understand that I can connect to the free analog expansion ports (4 to 7) and use ana…