Originally Posted by chopsuey
Do you pass all 3 or 4 channels through the PIC? If anything were to happen to the PIC you could lose control of the plane right? I want to make sure I understand everything before I try to do it myself.
I pass 4 channels across. I measure the pulse width of channel 0 to decide if the radio is on or not. You are correct that if I loose the PIC, I loose control.
The PIC has a watchdog timer to handle lockup but a total failure would, indeed, be a disaster. The servo chatter I see is so small that you don't see the controls move but you do hear the servo. If I can't figure it out I might go to a discrete circuit next time around. That's why this is prototype #1
I've flown the plane in failsafe (depending on the PIC) mode a couple of time while gathering altimeter data. With any luck, the UAV will get to take control for a couple of flight tests, itself, this weekend. My poor little slo-stick is pretty darn heavy at the moment..