A DIY The Wrench maker has built a smart desk dustbin with an automatic iris-style lid, adding both functionality and a ...

An Arduino Due forms the heart of the project ... such as this one on a tidy custom PCB, and this one built into an old radio case.

So in that light, building your own DIY calculator might not seem too exciting. But we can’t deny this Arduino calculator ... perfboard with jumper wires; no PCB fabrication required for this ...