Microchip has a pretty good video and document (the video is better).
Has a lot of things to consider.

http://www.microchip.com/webinars.microchip.com/WebinarDetails.aspx?dDocNam=
e=3Den528480

--McD

On Thu, 2015-11-26 at 03:26 -0500, Jim Ruxton wrote:
> I am using a pot and the high resolution mode of an A/D on the 16f1828 .=
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> I am directly controlling a 10 bit PWM with the result of the 10 bit A/D=
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> input. I have a problem in that I want to avoid the noise of the A/D=20
> input from affecting my output. This happens if my pot is set just=20
> between two levels so the output fluctuates between two levels. Not very=
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> much only 1 or 2 levels out of the 1024 but this is significant in my=20
> application. I really only want the output to change if I physically=20
> move the pot. Currently I have fixed it by only outputting to the PWM on=
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> the output if the input changes by more than 2, assuming if it does I am=
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> moving the pot. This works in that my output is steady however it=20
> effectively lowers my resolution as well since the output now steps only=
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> when the pot moves more than 2 values. I was wondering if I should set=20
> up a timer interrupt for say 1 second and  if the output changes by more=
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> than 2  during that second assume the pot is being moved and allow level=
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> increments of 1. If it didn't move by more than 2 during that second=20
> assume the pot isn't being moved and lock the output. Am I on the right=20
> track here or can anyone recommend another technique .
> Jim
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>=20


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