My electronics skills are a bit lacking, so I'd really like some help so that I don't blow up my board. :)
So, I've got a 12V analog input and, as to my understanding the analog input on the Arduino only reads up to 5V.
It is a 12V wire with a variable amount of resistance put on it.
My thought was to build something like this where Rx is a variable resistance:
12V -> Rx -> R1 -> Testlead -> R2 -> Gnd
R1 would be a resistor to step down the voltage from 12V maximum to 5V max. R2, as I would see it, would be R1 + max (Rx).
I'm not sure what R1 needs to be, nor what the range of Rx is.
Does this sound doable? Thx!