Running on a 7 inch 4.0.3 Android tablet, Huawei Mediapad. I intend to progress it to a nice glass cockpit display mimic popular PFD/MFD but it's a long way, the autopilot function is the primary goal.
APM code is modified to run steppers motors using AccelStepper library:
I forgot: in disarmed mode power voltage is removed from steppers which leaves them with no resistance to movements. Will be a good design to provide somewhere at the last connection a shear pin in the (highly improbable) event the stepper will block internally.