I am trying to write Arduino code to read PWM signals from Spektrum receiver.  Decided to examine and document the receiver output waveforms with an oscilloscope and video camera. Thought this information might be of some value to others trying…

Will changing my APM 2.5 quadcopter from 3S batteries to 4S batteries change the flight dynamics enough to require a change in PID settings?

I have a 650mm quadcopter with an all up weight of 4 lbs. 10 ozs. Flight controller: APM 2.5. With 12 x 3.8” props the hover is very stable. Just a little bit of wobble near ground level. The frame is made by Dynam and has very short legs; the props…