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

On 2015-11-26 02:08 PM, John J. McDonough wrote:
> 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?dDocN=
ame=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 .
>> I am directly controlling a 10 bit PWM with the result of the 10 bit A/D
>> input. I have a problem in that I want to avoid the noise of the A/D
>> input from affecting my output. This happens if my pot is set just
>> between two levels so the output fluctuates between two levels. Not very
>> much only 1 or 2 levels out of the 1024 but this is significant in my
>> application. I really only want the output to change if I physically
>> move the pot. Currently I have fixed it by only outputting to the PWM on
>> the output if the input changes by more than 2, assuming if it does I am
>> moving the pot. This works in that my output is steady however it
>> effectively lowers my resolution as well since the output now steps only
>> when the pot moves more than 2 values. I was wondering if I should set
>> up a timer interrupt for say 1 second and  if the output changes by more
>> than 2  during that second assume the pot is being moved and allow level
>> increments of 1. If it didn't move by more than 2 during that second
>> assume the pot isn't being moved and lock the output. Am I on the right
>> track here or can anyone recommend another technique .
>> Jim
>>
>>
>
>

--=20
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