So when you get your PI Zero it has no USB charging, it needs to be powered via a micro USB, bit of a pain for cables. So what this does is its a board that attaches to the bottom and connects a USB port to the micro USB bottom connections so i can power it via USB like so. The blue lights are 3 surface mounted SMDs on the power line by the looks of things, they have no function apart from telling me it has power

and looking awesome.
That is just a polite way of saying ive electrocuted my self more times lol, i could never get the hang of soldering though.
I mean you probably could, in the crudest form all it is, is a micro controller, usb ports, surface mounted resistors and capacitors but as the saying goes, why reinvent the wheel and it would probably cost more, although it would be kinda cool and a great project to follow.
AAAA my lawn mower

Ive got 2 Ultrasonic sensors, 1 motor driver and 3x motors. At the start im using my Arduino as its sad seeing it lonely and i will be doing this
https://www.circuito.io/app?components=9442,11021,11696,13678,13959,13959,7654330 the idea is the sensors detect whats around it, the arduino works it out and away it goes mowing my garden, Then on V2 i will do this
https://www.circuito.io/app?components=9443,11696,13959,13959,200000,7654330 but with a PI4. My only reason is a Arduino is stupid, its just a case off. wall in front turn left. Where a PI could go, wall at 400m, save that for later and make a layout of the garden.