If you’re a programmer with a knack for making things — like Simon Boak — you custom build a replacement. This is the SB116, an 8-bit programmer’s calculator powered by an Arduino Nano.

Ok, we’ll come clean. [Design Build Destroy] didn’t really add any memory to his Arduino Nano. But he did get about 1.5K more program space when compared to the stock setup. The trick? On some ...