Instead of using a resistor voltage divider off the 9v battery + side to =
an ADC input to measure battery level, how about this:

I already have an anti-backwards-battery diode between the 9v battery =
and the voltage regulator. Off that diode add two more diodes and =
connect to one side of the on-board comparator. Connect the other side =
of the comparator to the 5v output of the voltage regulator. Add a 5.3v =
zener to the comparator battery input to keep the voltage safe.

3 diodes, and when the battery drops below 6.8 volts, the comparator =
should trip. Right?

Seems more reliable than mega ohm voltage divider resistors into an adc.



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