>>The result is that the error has been reduced as I'm now
>>reading $002 instead of $004 or $008 in the 'unused' channels.

>I've never seen a "noise problem" when using the A/D.  Every time I pull
the
>pin to ground (turn the pot to zero) it reads 0x000.  Not 0x002 or 0x001,
>but 0x000.
>
>There must be something else causing it not to drop all the way.  But at
>320us, it sounds like you're giving it plenty of time.  Have you tried
500us
>just to see?  How about 1ms?

I do wonder what the impedance to ground on the unused inputs is. Was the
ASCII Art circuit what you actually have external to the PIC? Otherwise I
would tend to agree with Drew, but the situation he talks of also puts a low
impedance on the port pin by turning a pot to ground.

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