My flying buddy and I are trying to finish off our APM build, but are running into a very odd problem, and we are not sure what could be causing it. That is normally a good reason to ask the internet, but I thought I would ask the professionals first!
APM1280 with Oilpan (H) connected to power from the ESC
When connected to the USB, IMUs power up, GPS locks and we are all happy. Telemetry comes through the USB and everything looks good. As soon as the battery is plugged in, or it is started up on the battery, GPS drops off line, telemetry reports no GPS and only the IMU/Gyro/etc work.
The software tester in me thinks that we have a power problem, and feeding the APM through the receiver is probably not a good idea, but that a separate 2s LiPo providing dedicated power is. I have _never_ seen the GPS drop off-line in testing on the bench before and it is only when in the airframe that we see this problem (i.e. not on USB power only)
Any ideas welcome, and suggestions gratefully received.