Abstract

• Microcontroller based security lock system is an access control system that allows only authorized persons. The electronic controlled assembly allows the system to unlock the device with password. This system has a keypad which the password can be entered through it. If the entered password is correct then the word “CORRECT” will display on LCD and the lock opens. If the incorrect password is entered three times then the word “THIEF” will display on LCD and the alarm will ring by producing sound from buzzer. This circuit can be used in bank for security, steel safe and security door lock to secure them against thief. The microcontroller based security lock system is designed and constructed by using major components programmed microcontroller PIC18F452, 4×4 keypad, LCD (Liquid Crystal Display) and abuzzer.