A small panel DC digital voltmeter will be used to monitor the 5-V regulator’s voltage of the Arduino. Although there is an onboard LED, the DC voltmeter will serve as a visual indicator alerting the ...

However, all the 60W power bank on the market are bulk and expensive. That is why I decided to make my own. While I was designing the power bank, I thought to myself, why can’t I make one with a ...