#define DEADBAND 1

if ((oldval + DEADBAND) > newval)
    updateVal(newval);
if ((oldval - DEADBAND) < newval)
    updateVal(newval;

Don't worry about rollover/under, as long as all values are unsigned.

Still dithering? Increase DEADBAND to 2.

Cheers, Bob

On Thu, Nov 26, 2015, at 08:28 PM, Jim Ruxton wrote:
> Thanks everyone for the suggestions. I don't think in my case it is=20
> really a filtering issue because for example if my POT is set close or=20
> on the edge of an A/D transition I believe I will still see a bit=20
> flipping occasionally in the LSB if I have lots of filtering. Not sure=20
> if I am being clear but I really only want to have the reading change my=
=20
> output if I am moving the POT so thought there would be a clever way to=20
> detect that and only update my output if the input is varying=20
> substantially.  Perhaps to really get the best results I need a=20
> multiturn POT or move to a digital encoder.
> Thanks,
> Jim

--=20
http://www.fastmail.com - Same, same, but different...

--=20
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