01-10-2014, 11:13 AM
SMS BASED HOME SECURITY SYSTEM
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INTRODUCTION:
Security has been an important issue in the smart home applications. Conventional security systems keep homeowners, and their property, safe from intruders. A smart home security system, however, offers many more benefits. A smart home or building is a home or building, usually a new one that is equipped with special structured wiring to enable occupants to remotely control or program an array of automated home electronic devices by entering single command. For example, a homeowner on vacation can use a Touchtone phone to arm a home security system, control temperature gauges, switch appliances on or off, control lighting, program a home theater or entertainment system, and perform many other tasks. The WSN data collecting node module is connected with Piezoelectric Infrared Detector, Temperature Sensor, Smoke Detector and Gas Sensor separately. When the PIR finds that some people intrudes into the house or when the temperature sensor detects too high indoor temperature or when the gas sensor detects leakage of gas, the data collecting node will send encoded alarm signal to the WSN center node through the wireless sensor network established in home. Once the WSN center node receives alarm signal, it will send alarm short message to the users through the GSM module and GSM network immediately. Similarly the user can also control the various devices connected with device control unit through SMS. Using Bio sensors to measure heart rate and blood pressure from human body this method is using especially for old people. Biosensor senses data and send to the owners or users mobile phone. It will send alarm short message to the users through the GSM module and GSM network immediately.
THEORY OF OPERATION
In this project we interfaced 8051 microcontroller with sim-com 300 modem to decode the received message and do the required action. The protocol used for the communication between the two is AT command. The microcontroller pulls the SMS received by phone, decodes it, recognizes the Mobile no. and then switches on the relays attached to its port to control the appliances. After successful operation, controller sends back the acknowledgement to the user’s mobile through SMS.
AN INTRODUCTION TO 8051 MICROCONTROLLER:
When we have to learn about a new computer we have to familiarize about the machine capability we are using, and we can do it by studying the internal hardware design (devices architecture), and also to know about the size, number and the size of the registers.
A microcontroller is a single chip that contains the processor (the CPU), non-volatile memory for the program (ROM or flash), volatile memory for input and output (RAM), a clock and an I/O control unit. Also called a "computer on a chip," billions of microcontroller units (MCUs) are embedded each year in a myriad of products from toys to appliances to automobiles. For example, a single vehicle can use 70 or more microcontrollers. The following picture describes a general block diagram of microcontroller.