>
> So if nothing in on position, then Rx + (Rx * 2) + (Rx * 4) + (Rx * 8) wo=
uld
> give the bottom resistance on a voltage divider, otherwise would leave ou=
t
> of the equation whatever tag is on, for example if 2nd and 4th are on the=
n
> : Rx + (Rx * 4) only...

If SPDT dip switches that pull up and down are used, then a R-2R
ladder could be implemented.  You could just directly take the 4 MSB
of the ADC output for the 4 switches.
I.E. something like
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=3DCT206124=
-ND



--=20
Jonathan Hallameyer
--=20
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