This is the circuit diagram of digital code lock system. This system is used for security purpose. Most of the time it is used for the door locking. It can also be installed in other system where security is required.
Most important part of this interfacing is LCD and keypad interfacing. If password is correct then red light will glow or if password is wrong then RED light will glow. Password has been already during programming.
This system can be implemented easily. I have implemented it on proteus but i am 100% sure that it will also run when implementing on hardware.
CLICK HERE TO SEE THE PROGRAM IN ASSEMBLY LANGUAGE
