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 project uses an Arduino with a 4x4 keypad and an LCD to create a simple multiplication calculator game. The user is asked to solve a random multiplication problem, and the input is verified ...

If you want to add a keypad to your Arduino project, the options are pretty limited. There’s that red and blue 4×4 membrane we’ve all seen in password-protected door lock projects,… ...

(keypad: columns and rows switching) So now you can see how the button presses can be translated into electrical data for use with a microcontroller. We can now start the real experiment with as ...

This is the SB116, an 8-bit programmer’s calculator powered by an Arduino Nano. It features a 128 x 64 pixel monochrome OLED display and can be powered by either a USB port or three AAA batteries.

Operating range: 10m (33ft) Frequency Band: 2.402 ~ 2.478GHz Dimension: 144 x 74 x 27mm Weight: 115g The Wireless Bluetooth Keypad Calculator is designed to be highly portable and user-friendly.

This little guy, while simple in nature, acts as a fully functional (and portable) keypad on the go! It comes with two main programs, and it connects easily to your Arduino. It can be used to: 1 ...