The Research Of Intelligent Security System Based On Wireless Sensor Network

In recent years, with the rapid development of economy and the concept of harmonious society, especially the stimulation and demand of major engineering to security industry, the security industry is facing unprecedented opportunities for development. With the help of current advanced technology, improve the performance of security system has become an important topic of security development.We analyzed the application situation of the wireless sensor network in domestic and foreign. We proposed an intelligent security system based on wireless sensor network design, to solve the drawbacks of traditional security systems. Compare with traditional systems, the new intelligent security system has the advantage of free wiring, low cost, convenient layout, etc. After comprehensive consideration the current popular wireless communication technology, this paper choose ZigBee technology which has slow speed of data transmission, low power consumption, large network capacity, as the key technology to build intelligent security of wireless communication networks. We can expected that ZigBee technology will be widely used in family intelligence field, the security industry filed, industrial control field, and so on.This intelligent security system included terminal alarm infomation acquisition sensor nodes and wireless network coordinator nodes. Terminal information acquisition sensor nodes contained two alarm nodes, ultrasonic detection alarm node and pyroelectric infrared detectors alarm node. Multi-faceted detection can be used to monitor the fixed place. By improving the transmitter driver voltage and the echo integration analysis circuit, the ultrasonic detection alarm was more sensitive and accurate. With the help of reasonable circuit design, the pyroelectric detection alarm was more miniaturization and hidden better. The teminal alarm information can be send to the network coordinator through the wireless network. In this paper, the wireless sensor network consisted a coordinated and two wireless terminals nodes, which together form a star network. The coordinator can link the wireless terminal node and inquired whether there was the alarm information. The wireless terminal node was responsible to respond.This article successful formed a ZigBee wireless network and realized the alarm information transmission.We can remotely control by via Hyper Terminal and displayed the alarm information by host computer interface. This program had good scalability and overcame many weaknesses of the traditional security system.