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Just some pics following a discussion over at HackADay: http://hackaday.com/2011/06/22/24-cellphone-buttons-controlled-with-6-microcontroller-pins/
interface keypad with arduinoby sathishk12
Creating A Resistor Based Keypad & Interface With Arduino!by EngineeringShock
Keypad With Arduino Without Using Keypad library (First Tutorial)by Omar Tarek
Create own Membrane Matrix Keypad (and hooking it up to the Arduino)by TheBestJohn
An Electronic Door Openerby colin353
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