[DonRotolo]

Too wild for electrical noise, but eliminate it anyway: Use a 0.1 microfarad (not critical, can be +/- 100%) capacitor between the wiper and ground.


What value pot? Should be 5k-10k for the RC ADC inputs.

Try it with 2 fixed resistors - does it still jump? (One resistor goes from +5 to center, other from center to ground, center is also your signal. 4.7k resistors or so).

Those should get you to the root cause.

Don