Design And Implementation Of Laboratory Wsn Security System With Patrol Function

Laboratories, as the core of universities and cradle of technological innovation, undertake a large number of major scientific research projects. So a reliable security system and high level safety precautions are essential to those important research centers. The increasing crimes of burglaries cause great harm on people’s life and their property. And if the theft happens in the laboratory, having valuable equipment especially invaluable experimental data and documents, the losses will be incalculable. The traditional security system in the buildings, with disadvantages of complicated wiring, low scalability, low sensibility, slow response and complex operation, can’t meet the demands of people. Therefore, a new design of security system for laboratory buildings is urgent and meanwhile, is of practical utility.This paper, through improving the flaws and vulnerabilities in traditional systems, designs a WSN security system equipped with portable nodes especially for laboratory buildings. Based on ZigBee technique, this security system realizes remote monitoring with the architecture of B/S. It uses ARM9and CC2530as its hardware platform, Zstack and Linux as the software platform. It interconnects ZigBee network and Internet under the technical support of embedded web server and Sqlite. Through Common Gateway Interface (CGI), it embeds the dynamic data into the web pages and realizes its function of remote monitoring. This system designs special portable nodes, carried by patrol security, to solve the problem of low sensibility and slow response. It designs a wireless combination lock to control the protection and removal of the system. Besides, a special detection mechanism, functioning to monitor the performance and alarming abnormal states, is designed to enhance the system’s robustness.The overall system includes the overall hardware and software design of network nodes in Zigbee-based wireless security system and software of embedded server. First, it explains this system in three aspects, namely requirement analysis, system structure and working principal. Then it gives a detailed description of the hardware design of the system. The nodes, used in the CC2530chip, includes coordinator node, monitoring node, control node, portable node and so on. Function-varied circuits are power supply circuit, reset circuit, JTAG circuit, coded lock circuit, alarm circuit and display circuit. In terms of wireless monitoring, it analyzes the ZigBee protocol and Z-Stack protocol stack framework. And node application softwares are designed under its hierarchic framework. It builds Linux development platform and uses embedded Web server and database server. Through CGI programming, it realizes the function of B/S architecture remote monitoring. Finally, it conducts the joint debugging of the system, which includes protection, removal, invasion, abnormal state of node, portable nodes alarming and remote monitoring. The experimental results show that the system is reliable and meets the expectation of security monitoring.