Door locking security system using gsm module.doc (Size: 3.59 MB / Downloads: 754) DOOR LOCKING SECURITY SYSTEM UING GSM ABSTRACT The main aim of this project is to provide security at homes, offices etc. The system automatically locks the door as soon as it receives a predefined message from the user. This project uses the wireless communication, GSM. To receive the messages from the user mobile, we need a GSM modem. This modem will be interfaced to the microcontroller through serial interface. A 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. A wireless modem behaves like a dial-up modem. The main difference between them is that a dialup modem sends and receives data through a fixed telephone line while a wireless modem sends and receives data through radio waves. If the user is somewhere s omewhere far from the main door and he wants to close the main door
right from the place he is standing, he has to send a predefined message to the modem. The controlling unit will be fixed at the main door. The controlling unit contains the microcontroller and the GSM modem interfaced to it. The microcontroller continuously checks whether it has received any message from the modem. When the user sends the predefined message to the modem, the modem receives the message and intimates the same to the microcontroller. The microcontroller retrieves this message from the modem by issuing certain AT and T commands to the modem. Thus, after receiving the message from the modem, the microcontroller automatically closes the door by rotating the stepper motor fixed to the door. This will be done perfectly without the involvement of any human. 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 d 1. Introduction 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. The system comprises a small electronic unit with a numeric keypad, which infixed outside the entry door to control a solenoidoperated lock with the help of 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 to unlatch the solenoid-operated lock 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 three times in a row, the code lock will switch to block mode. This function thwarts any attempt by „hackers‟ to quickly try a large number of codes in a sequence. If the user forgets his password, the code lock can be accessed by a unique 10 digit administrator password. The secret code can be changed any time after entering the current code (Master code).
2. Objective of the project The project intends to interface the microcontroller with the GSM modem and start/stop the vehicle engine by sending the predefined messages from the mobile to the controlling unit. The project uses the GSM technology and Embedded Systems to design this application. The main objective of this project is to design a system that continuously checks the messages if any, received from the user mobile and change the status of the engine as per the message received from the mobile through the modem. This project is a device that collects data from the mobile, codes the data into a format that can be understood by the controlling section. This system controls the engine motor as per the message received from the mobile. The objective of the project is to develop a microcontroller based control system. It consists of a GSM modem, microcontroller, the interfacing unit to allow the communication between the microcontroller and mobile and the required circuitry. 1.1 Background of the Project The software application and the hardware implementation help the microcontroller read the messages sent by the user
from a mobile phone or send messages to the mobile phone through the modem and accordingly change the status of the engine motor required. The measure of efficiency is based on how fast the microcontroller can detect the incoming message and act accordingly. The system is totally designed using GSM and embedded systems technology. The Controlling unit has an application program to allow the microcontroller read the incoming data through the modem and control the engine motor as per the requirement. The performance of the design is maintained by controlling unit. 3. Overview of the technologies used 3.1. Embedded Systems: An embedded system can be defined as a computing device that does a specific focused job. Appliances such as the air-conditioner, VCD player, DVD player, printer, fax machine, mobile phone etc. are examples of embedded systems. Each of these appliances will have a processor and special hardware to meet the specific requirement of the application along with the embedded software that is executed by the processor for meeting that specific requirement. The embedded software is also called “firm ware”. The desktop/laptop
computer is a general purpose computer. You can use it for a variety of applications such as playing games, word processing, accounting, software development and so on. In contrast, the software in the embedded systems is always fixed listed below: • Embedded systems do a very specific task, they cannot be programmed to do different things. . Embedded systems have very limited resources, particularly the memory. Generally, they do not have secondary storage devices such as the CDROM or the floppy disk. Embedded systems have to work against some deadlines. A specific job has to be completed within a specific time. In some embedded systems, called real-time systems, the deadlines are stringent. Missing a deadline may cause a catastropheloss of life or damage to property. Embedded systems are constrained for power. As many embedded systems operate through a battery, the power consumption has to be very low. Some embedded systems have to operate in extreme environmental conditions such as very high temperatures and humidity. Following are the advantages of Embedded Systems: 1. They are designed to do a specific task and have real time performance constraints
which must be met. 2. They allow the system hardware to be simplified so costs are reduced. 3. They are usually in the form of small computerized parts in larger devices which serve a general purpose. 4. The program instructions for embedded systems run with limited computer hardware resources, little memory and small or even non-existent keyboard or 3.2 The Evolution of Mobile Telephone Systems Cellular is one of the fastest growing and most demanding telecommunications applications. Today, it represents a continuously increasing percentage of all new telephone subscriptions around the world. Currently there are more than 45 million cellular subscribers worldwide, and nearly 50 percent of those subscribers are located in the United States. The concept of cellular service is the use of low power transmitters where frequencies can be reused within a geographic area. The idea of cell based mobile radio service was formulated in the United States at Bell Labs in the early 1970s. Cellular systems began in the United States with the release of the advanced mobile phone service (AMPS) system in 1983. The AMPS
standard was adopted by Asia, Latin America and Oceanic countries, creating the largest potential market in the world for cellular. In the early 1980s, most mobile telephone systems were analog rather than digital, like today's newer systems. One challenge facing analog systems was the inability to handle the growing capacity needs in a cost efficient manner. As a result, digital technology was welcomed. The advantages of digital systems over analog systems include ease of signaling, lower levels of interference, integration of transmission and switching and increased ability to meet capacity demands. The table below shows the worldwide development of mobile telephone systems. 4. Hardware Implementation of the Project This chapter briefly explains about the Hardware Implementation of the project. It discusses the design and working of the design with the help of block diagram and circuit diagram and explanation of circuit diagram in detail. It explains the features, timer programming, serial communication, interrupts of AT89S52 microcontroller. It also explains the various modules used in this project. 4.1 Project Design
The implementation of the project design can be divided in two parts. Hardware implementation Firmware implementation Hardware implementation deals in drawing the schematic on the plane paper according to the application, testing the schematic design over the breadboard using the various IC‟s to find if the design meets the objective, carrying out the PCB layout of the schematic tested on breadboard, finally preparing the board and testing the designed hardware. The firmware part deals in programming the microcontroller so that it can control the operation of the IC‟s used in the implementation. In the present work, we have used the Orcad design software for PCB circuit design, the Keil µv3 software development tool to write and compile the source code, which has been written in the C language. The Proload programmer has been used to write this compile code into the microcontroller. The firmware implementation is explained in the next chapter. The project design and principle are explained in this chapter using the block diagram and circuit diag
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