Hello guys, I made a GPS tracking and logging device(Logs data in SD card) using Arduino Mega, I've a Lithium ion single cell Battery to the device for supplying power, I want to measure the battery voltage level of the same battery, I'll add three LEDs to my device to indicate three levels of remaining power.
I don't want to connect battery positive supply to any Analog or Digital pin and measure.
I've seen few forums about measuring voltage using Internal Reference(This could be helpful). How to do this.?