Battery Condition Indicator
Created: Sep 01, 2014
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A battery indicator is a device that determines the condition of a battery, which is usually in a form of visual indication of the battery’s charging status. The device uses an LED as an indicator when the battery voltage drops to a certain level. This project is crucial especially in the case of an automobile’s battery which supplies power to the starter motor, lights and to the ignition system. Since battery is essential to the normal operation of automobiles, battery condition indicator should be encouraged to minimize the factors that cause vehicular accidents.
A MCP6541-E/MS op amp is employed as a voltage comparator. The non-inverting input is connected to zener reference source. Reference voltage is 5.1V. R2 is adjusted so that the voltage at the inverting input is half the supply voltage. When supply is higher than 10.2V, the LED will not light. When the supply falls just fractionally below the 10.2V level, the IC inverting input will be slightly negative of the non-inverting input, and the output will swing fully positive. The LED will light, indicating that the supply voltage has fallen to the preset threshold level. The LED can be made to light at other voltages by adjusting R2.
This monitoring system can be used as a battery indicator for automobiles, electronic devices, computers, and even to batteries that are not part of a system. It is applicable for systems located on remote areas.