05-11-2012, 05:34 PM
PROJECT REPORT ON PASSWORD BASED DOOR LOCKER
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INTRODUCTION TO DOOR LOCKER
The microcontroller based Door locker is an access control system that allows only authorized persons to access a restricted area. The system is fully controlled by the 8 bit microcontroller AT89C2051 which has a 2Kbytes of ROM for the program memory. The password is stored in the EPROM so that we can change it at any time.
The system has a Keypad by which the password can be entered through it. When the entered password equals with the password stored in the memory then the gate gets open. If we entered a wrong password then the Alarm is switched on.
This system is best suitable for corporate offices, ATMs and home security.
CIRCUIT DESCRIPTION
In this project we have used 8051 microcontroller.20th pin of microcontroller is ground whereas 40th pin is supply.
The system comprises a small electronic unit with a numeric keypad, which is
fixed out side the entry door to control a stepper motor. When an authorized person enters predetermined user ID and password via the keypad, the stepper motor is operated for a limited time so the door can be open. At the end of preset delay, the stepper motor is operated in reverse direction and the door gets locked again.
When the code has been incorrectly entered, the code lock will switch to block mode.
A buzzer is provided for audio acknowledgment of the wrong password.
This project uses regulated 5V, 500mA power supply. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac out put of secondary of 230/12V step down transformer.