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 ...

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 ...

(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 ...

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 to check fitment.

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.

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.

Like a standard calculator, it sports a 12-digit keypad LCD at the top. Its two-tone color scheme consists of white chiclet-style keys set against a silver frame.