Design and development of a password- based door lock security system

Abstract

This work is a design and development of a micro-controller based, password enabled door lock for home security. The work involved building a working model of a security door lock that is password protected with an AT89C52 microcontroller which operates by sending control signals to a H-bridge that controls the opening and closing of a model door connected to a stepper motor. Accessing and changing various information and settings are done via an electronic system that allows the user to enter secret pass codes via a 4 4 keypad and a 16 2 LCD display. The design incorporated a serial EEPROM that can retain the information during power outages and runs on available power from the mains supply. Once the circuit is plugged to the mains supply, the LCD displays the different menu functions and waits for data input from the keypad, the illustrative door slides open and close when a valid pass code is entered.
The work was designed, developed, and tested and found to perform according to design objectives.

Key words: Security system, Microcontroller (AT89C52), Keypad access, EEPROM