It is a simple digital voltmeter, which can safely measure input dc voltages in 0 to 30V range. The Arduino board can be powered from a standard 9V battery pack ... to compute the actual voltage being ...

Here, you’ll learn the quick and easy way to get your sensor up and running, learn a few tricks for doing sleep Arduino environment ... and even read the battery voltage – all of these ...

Wyatt]’s CPUVolt library provides a fast way to measure voltage using no ... but he provides example Arduino code showing how handy this can be for battery-powered projects.