Hi - According to my oscilloscope, when the Pixhawk Mini is fully armed, there is just a constant 1500 us width pulse on channel 3 (which is for the throttle in the Pixhawk Mini airplane configuration). Since the signal is a constant 1500 us, the ESC never arms etc, which is irrelevant anyway (since the the pulse width never changes).
The servos work, everything else is as expected (except for an annoying general flakiness of the airspeed sensor calibration, which should have been taken care of by the new generation airspeed sensor with supposedly corrected 5V/3.3V issues). But I'll try to debug the I2C bus later - does anyone know why pin 3 just has two states, which is off, and constant 1500 us pulse width?
If there weren't any signal on the pin, then I would assume the board is bad or something, but this smells like a weird configuration issue.
(yes, most recent firmware; checked all the obvious things). Any ideas or hints would be much appreciated!