Raj designed a car battery volt-meter. The core of the project is a PIC16F1827 which uses its internal fixed voltage reference FVR and ADC to precisely measure the battery voltage. Measured voltage is displayed on a 4 digit 7 segment display. His circuit is connected to the car’s battery through a standard car lighter jack.
Via the contact form.
The missing link http://hackaday.com/2011/07/13/automotive-battery-voltage-monitor/
Sir can u give me program for”voltage monitor for car & its charging system”