Design Of The Large Building Security Mon Itoring System Based On ZigBee

Recently,with the rapid development of social economy,city community buildings tend to be more bulky.On the one hand,the large building improve the utilization of land,on the other hand,also can bring a lot of hidden danger.In recent years,safety accidents of a fire,natural gas or gas leakage,theft happen in many community.Due to the high floors and many households of large buildings,once accidents occur,if them are not promptly treated,it will cause a lot of property damage and casualties.To avoid such incidents,there must be efficient and intelligent security monitoring systems to forecast these threats,so that household have enough time to move to a safe place.some community buildings are equipped with safety monitoring system,but a single monitoring,only local alarming,lack of remote monitoring,resulting in an accident treatment is not timely.For large buildings,many households,in order to security monitoring for each household,requires a lot of monitoring points,each monitoring point also monitors a variety of data,while requires effective remote monitoring.To considerate into the wiring and cost,the use of Zig Bee wireless sensor networks is more suitable,Zig Bee sensor network can accommodate many nodes,which is very consistent to large buildings monitoring system with many sensors.In order to achieve the building remote control and management,the paper designs B/S(browser/server)management mode.A lightweight web server builds in Raspbe rry Pi,dynamic web development uses python and php scripting language.Collected data of sensors pass Zig Bee coordinator node with GPRS module through a wireless communication network.The coordinator node and raspberry sent via a serial port connection,the data via a serial port to the web server.For the problem of single function,data and blind spot volume of large building safety monitoring,the design of large building security monitoring system based on Zig Bee,which adopts sensor network structure of multiple coordinator node to solve the monitoring problem.Zig Bee network nodes use CC2530 with low power consumption as microcontroller,which really-time collect building temperature,gas,smoke,infrared and other data through a variety of sensors.Management center visually manages each node.When receiving alarm information,manager can query node information and notify the security guard,while inform resident with SMS.Experimental results show that the system can reliably complete real-time data acquisition and accurately complete alarm functions.Management center can access information of each node.