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DESIGN AND CONSTRUCTION OF A CAR BATTERY MONITOR SYSTEM

 

ABSTRACT

This project is about making an electronic voltage monitor system for car’s battery and its charging system. It plugs into the car’s cigarette lighter receptacle and displays the instantaneous output voltage across the battery terminals on a 4-digit seven segment LED display. This helps you to get early warnings for possible battery and its charging system problems. Microchip’s PIC16F1827 is the main controller in this project, which uses the built-in Fixed Reference Voltage (FVR) module to achieve a very precise and accurate A/D conversion of the battery voltage.
This battery monitor is plugs in to the car’s cigarette lighter receptacle and displays the instantaneous voltage across the battery terminals. When the engine is turned off, the voltage measured by this device is the actual output voltage from the battery. However, if the engine is on or the car is running, it actually measures the charging voltage across the battery that is coming from the car’s charging system (alternator + rectifier)

This car monitor uses +5V power supply for the PIC16F1827 microcontroller circuit is derived from the car’s battery output voltage (usually +12V) using a regulator IC (such as LM7805). The battery terminal voltage is measured through an ADC channel of PIC16F1827.

 

 

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