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An interesting line-following simulator to use with with your robocars:
https://github.com/ron-grant/LFS
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But at least something that's quick and easy fix then. Thanks!
And seeing how it's just a couple of pin headers I can't imagine how they can be soldered wrongly. I just measured to be sure and there are no shorts. As I mentioned, neither servo input or output is working. The only servo port working is CTRL. When I connect a receiver channel to input 1-4 the signal is pulled down to 1v p-p (puls timing is still fine). Output signals are about 0.5v with lots of noise. I can post some scope pictures if you want.
Ardu.jpg
Just to confirm, your servos (connected to ArduPilot's OUT pins) aren't working in either RC or autonomous mode? If that's the case, it's almost certainly a soldering error or the connectors are plugged in backwards.