Keypad security with 8051 Microcontroller

This project interfaces famous Microcontroller AT89C51 with LCD 16×2 with 3×4 Keypad. This project asks the user to enter password to unlock the lock or light up the LED. Password security via keypad can be very productive you can just put a security lock outside your door and use a servo motor to unlock the door if the user enters a correct password. However, in this project we use a simple LED if the user enters a correct password LED will glow else not. To see how to interface a simple keypad with LCD using AT89C51 please visit here....