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 ...

This calculator solves a more practical problem ... Next up, a custom PCB to connect the keypad to an Arduino and a 20×4 LCD display was milled up, while a test case was designed and printed ...

Featuring an Arduino Nano microcontroller board and the keyboard from a small numeric keypad the LCD display the calculator is powered by a set of AA batteries through a DC-to-DC converter.

It’s also programmable, built atop an open-source framework that is compatible with a number of coding environments including Arduino and ... probably the only cool calculator watch and a ...

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 ...

connect to the column C1-C3 pinouts of the keypad Next is a project example, where the Arduino is instructed to do something based on a correct key (secret number) being entered into the keypad, ...

Watch the video below to learn more about his Arduino-based portable keypad that connects to your Arduino development board and offers the complete alphabet, numbers 0-9 as well as several commands.

The keypad works alongside any existing Bluetooth keyboard to give you access to a full number pad that doubles as a calculator at the press of a button. You can get it now on Amazon for $34.99.