Password based Digital Door Lock system using 8051 micro controller

The goal of this project is how to make a password based digital door lock system for your home, office, university e.t.c 

The brain of this project is 8051 micro controller and Relay is the heart of this project these are the two major component of this project. The password is already saved on 8051 microcontroller memory a predefined password is  DB 49D,50D,51D,52D,53D,0 if we convert this in to decimal we will get 1 2 3 4 5 so this is our password when we enter this password with the help of keypad the microcontroller will match the entered password with bulletin saved password if both password matched the p2.0 will high and relay would be ON .

The password is not fixed you can change this password by simply change in source code so choose best password for your digital door lock system .

After successful completion

~~~~ Password Based Security System ~~~~~~// This message will be appear on L.C.D
~~~~~ Input 5 Digits ~~~~~~~~// Enter your desired password
~~~~ Checking Password ~~~~~~ // will check your password that is it correct or not 
~~~~~Access Granted and Door open ~~~~ // if your password is correct
~~~~~Wrong Password Access Denied ~~~/// This message will be appear on LCD module 

components required 

* 8051 Microcontroller
* LCD 16*2
* Keypad
* Realy ( 12v )
* Transistor ( Bc548 )
* Diode ( 1n4007 )
* Cystal oscillator 11.95 Mhz
* Capacitors: 33pF , 0.1uF , 10uF
* Resistors: 10K Ohm , 1100 Ohm , 18.2K Ohm , 1330 Ohm , 14.7K Ohm and 10k Res network

Schematic