Programming in Arduino’s custom version of the C programming language can be scary for anyone used to working with the relatively more user-friendly Python language, but a calculator is a relatively simple concept that gives you an ideal reference point if you want to make the jump. And if you don’t want to code, but you do like the look of a retro Soviet-looking desktop calculator, Oskar has made the code available on his GitHub page. This project has been so beautifully realised that you may, at first glance, think the case has been upcycled from an existing build. It hasn’t: the case is made from 3 mm plywood, designed in the Onshape CAD software, and cut out by a laser cutting company, finished off with a walnut veneer and a few coats of linseed oil. Gorgeous!