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Scoop.it!
This project implements an electronic safe, powered by an Arduino Uno. The safe has three main components: An 16x02 LCD Monitor and a Membrane Keypad for the user interface, and a Servo motor that powers the lock mechanism. The state of the safe (locked/unlocked), as well as the secret code are stored in the Arduino's EEPROM, so the code isn't wiped even when the power goes off. 
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Scoop.it!
Para este POST vamos a utilizar un teclado matricial 4x3 (0 - 9, *, #). Este teclado cuenta con 7 pines de control, por ejemplo, cuando apretamos la tecla número 1 se conectan los pines 2 y 3, para la tecla 5 se conectan los pines 7 y 1, y así sucesivamente. Por lo tanto los pines correspondientes a las filas del teclado matricial 4x3 son el 2, 7, 6 y 4; y los correspondientes a las columnas el 3, 1 y 5.
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