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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/
Arduino Based Door Locking Systemby Ajyhooda
interface keypad with arduinoby sathishk12
Creating A Resistor Based Keypad & Interface With Arduino!by EngineeringShock
LCD and keypad interfaceby DavidM386
Arduino 16x2 LCD Display and 4x4 Matrix Keypadby PugazhM
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