Hi, N'geron

there's a way to do it with a simple 16F84 an the RC Time command ...

look :

first : connect a resistor between your voltage to be mesured and the input port. a capacitor between input and ground.

second : make your input a 0 v ... output

Third: make the input ... an input with RCTime and measure the time to go up from 0v to the pic transition input voltage (1.5v) ...

so, time = - RC Log ( 1.5/ Vbatt ) ...

a small lookdown table will easily translate time to voltage, if needed.

of course, you must reduce your batt voltage to fit into the 0 - 5 volts range or use a zener not to exceed the Pic input range.

not so precise as an ADC ... but useful here.

Alain