I don't understand, I do have a common ground, don't I? The right hand side of my diagram?
then u can just use analogRead()..when it reads 0 no removable station is connected...when it reads x (x>0) then a removable station with resistance Rremo=(Vref-Vsen)/Isen (where Vsen=(x*Vref)/1024 and Isen=Vsen/(10kR))...u can configure Vref via this:http://arduino.cc/en/Reference/AnalogReference?from=Reference.AREF
Ok so if I set Vref to 5v and instead of a 10K known resistance I have say a 3.3K would that work?
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