“Ever wanted a powersupply that you can use on the go, even without a wall outlet nearby? And wouldn’t it be cool if it was also very precise, digital, and controllable via PC? In this instructable I will show you how to build exactly that: a digital battery operated powersupply, which is arduino compatible and can be controlled via the PC over USB. A while back I built a powersupply from an old ATX PSU, and while it works great, I wanted to step up my game with a digital powersupply. As already said, it is powered by batteries (2 lithium cells to be precise), and it can deliver a maximum of 20 V at 1 A; which is plenty for most of my projects that require a precise powersupply.”