A 16 key pad would have 4 columns by 4 rows. Some time ago, I bought a couple of 3×4 membrane keypads from eBay. As usual it’s packed with zero ... (secret number) being entered into the keypad, ...

Design your own keyboard, of course. ... with a pair of Arduino Pro Micros running the show. [ToasterFuel] had to wire up the whole thing by hand because of the num pad, ...

Instead of fixing the problem, [Maximilian] made it worse by interfacing a rotary phone as a num pad. An Arduino counts the pulses and feeds them to the computer via a serial connection.

Meet the Arduino Esplora, an open source Arduino Leonardo based gaming pad that can be used in DIY Gaming projects, ... like a mouse or a keyboard. 3. VIEW GALLERY - 3 IMAGES.

The TK-TCT005BK is a combination USB touchpad and number pad. Press the familiar “num” button on the top edge and it works just like a numeric keypad.