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This instructable will show you how to make a pass-code lock system using the Arduino Mega board.
Whenyou type the right code, an LED lights up an the servo moves to open a lock.
What you will need:
--->one Arduino Mega (the arduino uno or duemilianove does not have enough digital pins for this project)
--->one LCD module
--->one Battery pack (or you can use the USB cable and PC power)
--->one 10K Ohm potentiometer
--->four 10K Ohm resistors
---> hookup wire