>
> Does anyone have any experience implementing digital
> filters, specifically low pass filters,  on the lower end PICs,
> e.g. the 16C71?
>
 One way to do it is inc or dec your variable every time you check your
input instead of passing the full input value. Variations on this theme
is the basis of DSP. Loop speed, adding some fraction of the difference
between input and output, etc. are all affect your cutoff. -Rick