But we can’t deny this Arduino calculator project by [Danko ... switches for the keyboard and a very crisp 128×32 I2C OLED display. Beyond the battery, a crystal, and a handful of passive ...

Powered by an ATMega328p pulled out of an Arduino Nano, if offers the same ... tactile buttons on the PCB as well as an 128×32 I2C OLED display. In a future version, [Electronoobs] says he ...