How to convert Resistance to digital data directly
David VanHorn email (remove spam text)
At 08:16 AM 4/30/01 +1200, Russell McMahon wrote:
> What sort of caps are you using?
>Presumably Mylar or similar rather than eg ceramic.
Ceramic at the moment.
I discharge through a fixed R, then through two variable Rs (in turn) so my
answer should be:
S1=V1/Fixed and S2 = V2/Fixed With S1,2 = 0-15.
This way, the absolute value of the cap isn't so important, and drift isn't
There is also a routine, during the establishment of the Fixed value, that
steps down the T1 prescaler, looking for the largest result that will fit
in an 8 bit word (T1H= 0)
That way, the routine is maximally tolerant of absolute values.
My biggest problem is this apparent variability in the low threshold, for
reasons that are not obvious.
Dave's Engineering Page: http://www.dvanhorn.org
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