ABSTRACT
This project designed a digital electronic lock which used a MCU as data process and control chip.The main funcitons of the digital electronic lock are as follows:
Entering the password: pressing one number button,one signal number will show on the digital tube .
Openning the lock: pressing the unlock button, the system will check up the numbers and password entered,if yes the lock will open,or it will not open.
Changing the password:setting the new enter number that needs to be confirmed twice as the new password when the lock is open.
Preventting the repeated test:when entered the wrong password over target times,the buzzer will alarms and locks the keyboard at the same time.
Wrong operation warning:if you have wrong operation,there will be some simple warning messages.
The design of the electronic password lock is mainly made up of four parts:4x4 matrix keyboard interface circuit,data processing and display circuit. In addition the system also consists of LED ligths,alarm buzzers,single-chip reset circuit and so on.
The key question of the electronic lock designing is the realization of functions,such as the input password ,clear password,unlock,changepassword and other functions.