At 11:06 AM 11/20/2003 -0800, Tom Deutschman wrote:

>This may help http://www.microchip.com/download/appnote/pic16/00234a.pdf

That's the general idea, but I'm looking for something that will help calculate resistance values for maximum spread.

The circuit that I have to work with, has three resistors in series, across a cap. Two of the resistors have buttons across them, the last one does not.

Crude ascii art

          /-S1--+-S2--\
          |     |     |
Pin-----+-+-ra--+-rb--+-rc----Ground
        \------------C--------Ground


So I have four time constants:

C*Rc
C*(Rc+Rb)
C*(Ra+Rb)
C*(Ra+Rb+Rc)

I'd like to get as much spread as possible between the time constants.
(within reason!)

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