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DESIGN AND CONSTRUCTION OF DOOR
LOCKING SECURITY SYSTEM USING GSM


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ABSTRACT



This project presents a prototype security door that can be remotely controlled by a GSM phone set acting
as the transmitter and another GSM phone set with a dual tone multi-frequency (DTMF) connected to
the door motor through a DTMF decoder interfaced with microcontroller unit and a stepper motor .The
design is composed of four main functional modules, namely; the GSM module, the decoding module,
controlling module and the switching module. The GSM module act as both transmitting and receiving
unit employs the use of a mobile phone set serving as the communication device between the user at one
end and the object of access (i.e. the door) at the other receiving end. The decoding module and the
controlling module are made possible using modern integrated circuit chips ensuring proper conversion
of signal to binary codes, enabling the microcontroller to communicate properly with the switching device
responsible for opening and closing the door. The codes for this project was written in assembly language
with Visual basic software and compiled with M-IDE studio for MC-51compiler which work perfectly
with Window XP environment, the program run without error before it was burn onto the microcontroller
using a device called the programmer by placing the microcontroller on it socket equal to the pin number.



INTRODUCTION:


Security describes protection of life and property. There are doors to keep people out,
Key locks and chains reinforce the mode of security. Doors are being made of metals not just wood
anymore. Influential persons in our society have bullet proof doors to ensure a good measure of security of
self and family. The security sector is experiencing diversification as it has never seen before. This has
brought about the need to review the reliability of already existing systems and look into the possibility of
creating better systems that are smarter and more secure



SYSTEM DESIGN:


The design of a door locking security system using GSM is a complex design which
comprises of so many modules (parts) brought together to form the overall design. Each of these modules is
made up of discrete components that are joined together to achieve a particular purpose. These separate
modules are: The Power Supply Unit, The Buzzer Unit, The micro controller Unit, Telephone unit and
Switching.
These different units cannot function alone, they all need to function together to achieve the desired result.
The GSM modem received tone from the GSM network as shown by the direction of the arrow in the
diagram below and transmit same to the DTMF decoder but the current value was very small (i.e. about
0.1mA) it was step-up by the tone transformer so that it could be decode by the DTMF decoder which then
send the decoded codes to the microcontroller for processing and outputting to relevant component to act
accordingly



SOFTWARE PROGRAMS FOR THE MICROCONTROLLER:


Microcontroller is a programmable
device (Mazidi, 1997). It is an intelligent core for a specialised dedicated system (Sanchez & Canton, 2007).
The firmware part deals with programming the microcontroller so that it can control the operation of the
IC‟s used in the hardware implementation. In the research, M-IDE studio for MC-51 software development
tool is used to compile the source code, which was written in assembly language. The Universal programmer
was used to burn the compile source code onto the microcontroller.
Software development involves a series of steps which are necessary for the development of reliable and
maintainable software.


RESULTS AND DISCUSSION:


The prototype door security system developed in this project did well in
achieving its original goals. In the beginning the system will boot up with display on the LCD screen
prompting the user to enter pin code.
The password door lock system has a default password of “198526”, 196310 and the user is given only 3
attempts to enter the correct password. If not, the keypad will switch to block mode requesting for PUK
number which is “38893982” eight numbers. At the same time an alarm will sound until the PUK number is
imputed with correct PIN. The development of this technology for the field of security system is not only
possible, but it could even prove to be very useful.



CONCLUSION



The work was successful. It is evidence that the use of mobile phones with the right circuitry can be used to
operate a security system, since the mobile phone in today‟s world; it is an access device a lot easier and
affordable to obtain as opposed to specially fabricated keys and smart-cards. The ability of the system to
accesses a secure place (Home, office, ATM etc.) remotely almost anywhere in the world is a plus since
technology has made the world a global village.
The design consists of four main functional modules, namely; the GSM module, the decoding module, the control module and the switching module. The GSM module acts as a transmitting and receiving unit employing the use of a mobile telephone which serves as communication device between the user at one end and the access object (ie, the door) at the other receiving end. The decoding module and control module are made possible by modern integrated circuit chips which ensure proper conversion of the signal codes to binaries, allowing the microcontroller to communicate correctly with the switching device responsible for opening and closing the door. The codes for this project were written in assembler language with Visual Basic software and compiled with the M-IDE studio for MC-51compiler that work perfectly with the Windows XP environment, the program runs without error before recording it on the microcontroller using a device called the programmer by placing the microcontroller on it plug equal to the pin number.

Security describes the protection of life and property. There are doors to keep people out, key locks and chains reinforce security mode. The doors are being made of not only the most wooden metals. Influential people in our society have bullet proof doors to ensure a good measure of self and family safety. The security sector is experiencing diversification like never before. This has brought with it the need to review the reliability of existing systems and explore the possibility of creating better systems that are smarter and more secure.

The microcontroller-based digital lock presented here is an access control system that only allows authorized persons access to a restricted area, this system is best suited for corporate offices, ATMs and home security. It consists of a small electronic unit which is fixed at the input port to control a solenoid operated lock with the aid of a stepper motor when an authorized person enters a predetermined user password through the global mobile communications keypad, the stepper motor is operated for a limited time to unlock the solenoid operated lock so that the door can be open. At the end of the preset delay time, the stepper motor is turned in reverse and the door is locked again. When the code has been entered incorrectly three times in a row, the code lock will switch to lock mode, this function will frustrate any attempt by hackers to quickly test a large number of codes in a sequence. If the user forgets his / her password, code blocking can be accessed using a single 8-digit administrator password and the secret code can be changed at any time after entering the current code (master code).