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Project

Car's battery voltage and charging system monitor

Rating:

5

Author: Rajendra Bhatt

Last Updated: 2016-02-21

Package Version: 1.0.0.0

Category: Measurement

Downloaded: 2451 times

Followed by: 1 user

License: MIT license  

This project is about making a simple 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.

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DOWNLOAD LINK RELATED COMPILER CONTAINS
mikroC PRO for PIC
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc

Project Blog

This project is simply about making a precise digital voltmeter that plugs in to a 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). The functional block diagram of this project is shown below.

Car battery voltage monitor circuit powered from an USB car charger

Car battery voltage monitor circuit powered from an USB car charger

For simplicity, I used my spare USB car charger to provide +5V power supply to the circuit. The USB port has 4 pins (+5 V, D+, D-, and Gnd). In the car charger, the D+ and D- pins are kind of useless. So I opened my USB car charger, disconnected the outpu

View full image

The firmware for this project was developed in mikroC Pro for PIC compiler. The use of internal reference voltage for A/D conversion requires configuration of FVRCON and ADCON1 registers. The mikroC Pro for PIC compiler provides a library for A/D conversion, but that uses the supply voltage, VDD , by default as the positive reference for the conversion. So the built-in ADC library of mikroC Pro for PIC is not useful for our case and we need to write our own ADC subroutine. The complete source code for this project is provided in the attached file.

Device in Action

Device in Action

It measures the battery voltage very precisely.

View full image

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