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 NXP Semiconductors


  • Car Battery Status Indicator

  • Created: Sep 03, 2014

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Summary

A car battery is a type of a rechargeable battery that supplies electric energy to an automobile. It is usually a lead-acid type battery and is made up of six galvanic cells to provide a 12-volt system.

This circuit uses an LED and HEF4081 CMOS integrated circuit. The variable resistor sets the voltage at which the LED turns ON. Set the control so that the LED lights when the voltage from the car’s ignition switch drops below 13.8 volts. The LED normally will light every now and then for a short period of time. But, if it stays ON for very long, your electrical system is in trouble.

By using this monitoring system, it will save time and effort of the owner the hassles of manually checking the battery of the car. This project is advantageous to models of cars that still lack battery-monitoring systems.

2 Comments


Ed

What should be the voltage of the Zener D1?

Posted: Sep 19, 2014


Kristina Izarra

From the datasheet >http://www.diodes.com/datasheets/ds30506.pdf, a BZT52C3V6LP Zener diode has the following voltage range: Nom(V)-3.6, Min(V)-3.4, and Max(V)-3.8

Posted: Oct 08, 2014


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