>Yes. If that 512 mv was stable my rotation measurement would
> be simple

If the pot can have Vcc (I haven't met a pot that couldn't take
50mW), that would reduce the impedance and possibly make
the noise disappear. Even something as simple as a capacitor
on the ADC input may help

Also improve resolution too, if that matters. Currently you'd be
looking at about 1mV/degree over 450 degrees travel at the
pot wiper

With 5000mV reference, unamplified 521mV would mean about
5 degree resolution (ie 5000/1024 = 5mV per ADC bit)


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