ADI,

Made my PCB last weekend, positive presensitized board, it all came out beautifully, except after drilling i found out that some of the holes were way too small I redesigned it, so now i just have to do it all over again.

TheZoomer,

Sorry for the confusion, i didn't mean that the gyro source was the same for the scooter & wheelchair. What I was trying to blurt out was that the chair is so stable because they are probably using accelerometers to compliment the gyros, and to minimize the gyro drift. As Danvel pointed it out in an earlier post that with gyros only if you start out hovering with center stick, it will soon drift away from there and you'll have to correct with the stick, and even then you won't get a stable hover. Kalman filters seem to correct for gyro drift, and that would probably make it pretty damn stable. I've seen that wheelchair in Disney's Epcot center, it stays balanced upright like that for a long time.

Hardyus