Battery Level Indicator

Introduction

In this project, I will show you how to design a simple Battery Level Indicator Circuit using easily available components. Battery level indicator indicates the status of the battery just by glowing LED’s. 

Battery Level Indicator Circuit Principle

The heart of this battery level indicator circuit is LM3914 IC. This IC takes input analog voltage and drives 10 LED’s linearly according to the input analog voltage. In this circuit, there is no need of resistors in series with LEDs because the current is regulated by the IC.

Circuit Components

LM3914 IC

LED’s -10 (Red – 3, Yellow – 4, Green – 3)

SPST Switch

Resistors – 18KΩ, 4.7KΩ, 56KΩ

Potentiometer – 10KΩ

12V Battery (to test)

Connecting wires

LM3914 Features

Internal voltage reference from 1.2 to 12v DC.

Programmable output current 2mA to 30mA.

LED driver outputs are current regulated.

No multiplexing interaction between outputs.

It supports wide range of temperature from 0 to 70 degree Celsius.

For bar graph display – connect 9th pin of IC to the supply

For dot display – leave the 9th pin of IC