Abstract :

This project is used to develop the security for open and close of the door using wireless communication GSM technology.

             Security is prime concern in our day-to-day life. Everyone wants to be as much as secure as to be possible. An access control systems forms a vital link in a security chain. The micro controller based digital lock presented here is an access control system that allows only authorized persons to access a restricted area. This system is best suitable for corporate offices, ATMs and home security.

                        A GSM modem provides the communication interface. It transports device protocols transparently over the network through a serial interface. A GSM modem is a wireless modem that works with a GSM wireless network. This GSM Modem can accept any GSM network operator SIM card and act just like a mobile phone with its own unique phone number. Advantage of using this modem will be that you can use its RS232 port to communicate and develop embedded applications. Applications like SMS Control, data transfer, remote control and logging can be developed easily. The modem can either be connected to PC serial port directly or to any microcontroller.

            The main idea is to provide security for every home by implementing security system for doors using GSM technology. This project uses password system for opening and closing door.  This project is designed in such a way that a GSM modem is interfaced to the controller using serial communication.n this project we are going to use keypad to enter the security lock. Here microcontroller place major role which is nothing but decision of door opening. Here predefined password is stored in microcontroller.  Microcontroller takes password inputs form keypad input and when input matches with the stored password the DC gare motor is operated for a limited time to unlatch the solenoid-operated lock so the door can be open. At the end of preset delay, the DC gare motor is operated in reverse direction and the door gets locked again.  then door has to open and after some delay it will be closed status of the door will be displayed on LCD.when we enter the wrong password through keypad then “wrong pass

word” message will be displayed on LCD and buzzer will be on.

This project uses regulated 5V, 500mA power supply. Unregulated 12V DC is used for relay. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac output of secondary of 230/12V step down transformer.

TECHNICAL SPECIFICATIONS:

HARDWARE:

Micro controller         :           AT89x series                                    Power supply

Crystal                        :           11.0592 MHz                                   Transformer: 12V step down

LCD                            :           HD44780                                          Filter: 1000uf/25V

Keypad                                                                                              Voltage Regulator: 7805, 7812

Buzzer

L293D

DC gear Motor

SOFTWARE:

Keil IDE

UC flash

Proteus

APPLICATIONS:

• Industrial applications
• House hold applications
• Business applications