A meter to measure the electrical parameters ... along with the calculated power, on the small 0.5″ OLED display. The circuit is built around an ATmega328. To keep the board size small, and ...

The power meter itself is battery-powered via a 600 ... to monitor power consumption on this particular e-paper display project, it should be easily portable into other battery-based systems ...

The good news is that you can buy little adapters that show charging stats to help identify the problem. They’re called power meters, and they’re fairly inexpensive. USB power meters are pretty simple ...