Schematic: Simple battery monitor
By Ibrahim Kamal
30/5/2007

Brief Circuit explanation:

This is a very simple but effective and accurate battery monitor. The 4 LEDs D1 to D4 acts like a bar graph. R6 will adjust the threshold of the whole system (the point at which the battery is considered to be LOW) D5 is just a power indicator. This circuit could be simple modified to make an 8 LEDs battery monitor (or more!) The output of one of the op-amps can be fed-back to a microcontroller to give a signal when the battery is low.

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