Home Projects Test and measurement 12V Lead Acid Battery Voltage Monitor


12V Lead Acid Battery Voltage Monitor
author: Rajkumar Sharma

This project is a 12V Lead Acid Battery Voltage Monitor


12V Lead Acid Battery Monitor is a simple project which tells you the voltage of your Lead acid battery visually with the help of 10 LED's.  This project is based on the popular LM3914 IC from Texas Instruments.

The LM3914 senses the voltage level at the input pin and drives the 10 light emitting diodes based on the voltage detected on input connector. Circuit works on same battery, doesn’t not require separate supply input. Jumper is used to select the DOT mode or bar graph mode.


Supply input 15 VDC Max
Maximum and Minimum range selectable with onboard preset
Output 10 LED's
2 Types of display Bar and Dot selectable by a jumper
Very low current consumption, typical 100 mA
Header connector for connecting power / voltage in
Four mounting holes of 3.2 mm each
PCB dimensions 37 mm x 75 mm






120x90 spot



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