Cinput - arthurbenemann/ardupilot GitHub Wiki
Instructions: Connect your RC receiver to APM's inputs as instructed here. With transmitter on, move your sticks.
Input is displayed as PWM values, output is displayed as degrees of deflection of your servo. Hit Enter in the Serial console to exit.
Typical data:
http://ardupilot-mega.googlecode.com/svn/ArduPilotMegaImages/rctest.png
Troubleshooting: If all the outputs don't respond to your RC inputs, here are some possible causes: