[TriEmbed] Measure voltage

[The MacDougals]

I know how to set up a voltage divider with a couple of resistors to measure

battery voltage of ~12v on an analog pin that accepts 3.3v.

 

But, I really am interested in a small segment of the range, say 9v to 13v.

How would I "zoom" in on that range?  I want to subtract/bias the vbat

by the 9v minimum.  So, 9v -> 0 and 13v -> 3.3.

 

---> Paul

 

 

 

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