Home security system has been a major issue in present context. In a world where crime is increasing day by day, everybody wants to take proper measures to prevent the intrusion. In addition, there is a need to automate home so that the user can take the advantage of technological advancement. Thus, here we have a project to represent a model that will provide security to their home, office etc via SMS through GSM Technology. Keeping in view with the advancement in wireless communication, the project is mainly based in a system that uses GSM technology for the security and a microcontroller is used to control the entire setup.
Basic idea of this project is to provide GSM based home security even if the owner is away from the restricted area. This system consists of GSM modem for sending and receiving the SMS, AVR atmega32 microcontroller to control the entire system, LCD for display purpose, PIR to sense the intruder, temperature sensor for fire detection, UART for interfacing microcontroller and GSM modem and other supporting circuitries like rectifier, ac to dc conversion and etc. In this system, authorized person has the entire control and he will decide which people will enter the restricted area.Whenever a person tries to enter the restricted area, the PIR will sense it and the data is sent to the LCD display. The LCD will display the information and a message is sent to the mobile via GSM modem. Thus the authorize person will be informed about any kind of accident like intrusion, fire.
Basically, this project is one directional. In case of any kind of above mentioned accident, the person will be informed but the person cannot take the action immediately or the system cannot prevent the accident on its own. However this is a good representation of home security.The microcontroller used in this system is a very high speed one that assists in fast communication. This SMS BASED SECURITY SYSTEM has the feature of providing security to more than 4 devices.
Furthermore this system can be controlled from anywhere at any time. This makes the system flexible. And also the system has the feature of user-programmable plain text message control as well as communication can be made possible from any mobile. Concluding, this system is a very good example of an embedded system as all its operations are controlled by intelligent software inside the microprocessor.The idea used in this project aims to meet the upcoming challenges of the modern practical application of wireless communication and to facilitate our successors with such splendid ideas that should clear their concept about wireless communication and control system.
OBJECTIVES The main objectives behind this project are as follows:- To provide security to the restricted area from a remote place. Provides security without manpower so low cost and more efficient GSM Based Home Security System is used to watch the area as well as the property using GSM cellular technology.The main objective of GSM Based Home Security is to alert the owner by the phone or cell phone. To make the system much more user friendly. BASIC BLOCK DIAGRAM AND DESCRIPTION PIR SENSOR PIR sensor means passive infrared sensor that is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. The temperature above absolute zero all human beings emits the radiation they are not visible to human eyes, because the wavelength of radiation is infrared.
But they can be detected by electronics devices such as PIR sensor.PIR sensor itself does not absorb radiations or do not emits. It only detects the energy radiated by other objects and does not detect the temperature. So they are suitable for using home security purpose and often used.
The PIR sensor turns on when human approach and does not gives response when they are standstill. The PIR sensor works good in cold than warm. This because the temperature difference between air and human is greater so it will be easier to detect by sensor. The optimum temperature for PIR sensor is 15 to 20 grdc.Above this the sensor does not work properly. TEMPERATURE SENSOR Temperature sensors are devices used to measure the temperature of a medium.
The 3 main types are thermometers, resistance temperature detectors, and thermocouples. All three of these sensors measure a physical property (i. e. volume of a liquid, current through a wire), which changes as a function of temperature. In addition to the 3 main types of temperature sensors, there are numerous other temperature sensors available for use.
Now a day temperature sensor takes the part of the home security.They are used in the fire detection in the home by alarming us. UART A UART(Universal Asynchronous Receiver/Transmitter) is the microchip with programming that controls with the RS-232C Data Terminal Equipment (DTE) interface so that it can talk to and exchange data with modems and other serial devices. The UART converts the bytes it receives from the microcontroller along parallel circuits into a single serial bit stream for outbound transmission. In inbound system it converts the serial bit stream into the bytes that the microcontroller handles.It adds parity bit on outbound transmissions and checks the parity of incoming bytes and discards the parity bit.
It provides the some amount of buffering so that the microcontroller and serial devices data remains coordinated. AVR It is a programmable device which has a inbuilt memory, clock etc and is required to perform a specific task. This is the heart of our project. By doing program on it we can control the other component.
The controller we are using is ATmega 32. It is a high performance 8 bits microcontroller.
