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If you don't mind sacrificing a few of the 16 ios, you can connect potentiometers to the analog inputs on the EDU-RC. If you read these in the User_routines.c loop, they will update at the same rate as the radio would.
The Wiring does not seem to match a standard joystick pinout however. I believe that this could be fixed by switching the powers and the grounds on the joystick connector (I think the analog inputs are internally pulled up on the Edu-RC). Potentiometers work fine on the anolog pins.
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