Pin 1 - 4 (L -> R) of the keypad module connects to the Pin row_1 - row_4 of Arduino. Pin 5 - 9 of the keypad module connects to the Pin col_1 - col_4 of Arduino.

A keyboard matrix circuit is a design used in most electronic musical keyboards and computer keyboards in which the key switches are connected by a grid of wires, similar to a diode matrix. This kind ...

Arduino enthusiasts or those looking to learn more about programming with Arduino and electronics-in-general may be interested in a new Kickstarter campaign and Arduino compatible 42-Digit SPI Keypad ...