This is the circuit diagram of digital code lock system. This system can be installed for security purpose. Most of the time it is used for door lock system. but it can be used for many purpose where security is required. It can also be used for opening a bag.
Now i will talk about the interfacing part. You are required to know about LCD and keypad interfacing with microcontroller 8051. I have implemented it on proteus but i am 100% sure that if you implement it on hardware, Its very easy and you can implement it easily. I have written code for this project in assembly language.
I have connected two red and two green light. If entered password is correct then GREEN LED will glow or if entered password is incorrect then RED LED will glow. Most important feature of this project is that you can define your own password.
CLICK HERE TO SEE THE PROGRAM IN ASSEMBLY LANGUAGE
