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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