This calculator uses a full 16 button matrix keypad. The Arduino deciphers button pushes with the help of the Keypad library, at which time the appropriate character is displayed on the 2×8 LCD ...

Using a CNC ... and a little Arduino hardware. Featuring an Arduino Nano microcontroller board and the keyboard from a small numeric keypad the LCD display the calculator is powered by a set ...

This is the SB116, an 8-bit programmer’s calculator powered by an Arduino Nano ... of black acrylic and welded them together. The keypad’s fascia was cut and printed by Schaeffer AG, a ...

But not so if you’ve got this beautiful custom RPN calculator in a wooden case ... Next up, a custom PCB to connect the keypad to an Arduino and a 20×4 LCD display was milled up, while a ...