> think of the switches as bits of a D/A and wire them up in
> a R-2R ladder

http://en.wikipedia.org/wiki/Resistor_ladder

As I'm looking for 15 reasonably-well-defined discrete steps and
not the precision of absolute voltages, 1% resistors should be OK

I can use the same search and compare s/w, the only difference
being that the expected A/D results will be in order of the binary
value of the switches

Joe

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