Quote Originally Posted by w7ami View Post
The simplest and fastest would be to use a PIC with comparator. You would only need two resistors used as a voltage divider to bring your battery voltage down to something the PIC can handle. You can set the comparator reference voltage in code. You also can program the comparator to trip an interupt when the divided battery voltage drops below the reference voltage. You will need to look at the reference manual for the PIC you have to find out how to set the comparator and turn on the correct interupts.

Terry
Sorry to interrupt here, but im trying to build the same circuit to monitor a lipo battery on my RC heli. do you have a schematic for the voltage divider or what this circuit might look like using a 12v lipo batter? i am really lost on this project and cant quite get a handle on it!

from what i gather, the chip will compare the input voltage from the battery to the internal voltage and detect the difference? am i close?