HOW TO - Read a keypad with Arduino
Little-Scale shares tips for using a button keypad with the Arduino platform -
The idea of the digital scanning of a keypad is very simple. The keypad in question has twelve buttons, set up in four rows of three (like a phone keypad, for example). Each button has two connection points – one point goes to a row pin, and one point goes to a column pin. Therefore, seven pins are connected between the keypad and the Arduino – four for the rows and three for the columns. When a button is pushed, it connects the two points – a column pin and a row pin.
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Original post by Collin Cunningham