I've been having some troubles recently in switching between manual and automatic control on my ArduPilot board. It is currently controlling a crawler-type RC car, as some others have attempted. When I first power on the board (initially under manual control), everything seems fine and the GPS data seems to flow in OK. However, when I flip the toggle switch on my transmitter, the MUX light only will come on after "nudging" the throttle a little bit. Then, as the AP board adjusts the throttle, the MUX light will flicker on and off. Observing the serial monitor shows that the board reboots after each flicker of the MUX light and new GPS data acquisition, but the GPS data seems bad here, which is preventing my car from navigating in either RTL or WPT modes. Sometimes, the MUX light will not even stay on at all. Attached is an example of the GPS data that I've been getting after switching to MUX.
I'm not sure, but I think that my motors may be drawing a lot of current from the battery and that this may be affecting the AP board? Has anyone tried powering the board from a separate DC source (like alkaline batteries, maybe)? Does anyone have any thoughts?