Building Monitoring System Design And Implementation Based On Wifi

Building monitoring system is an important component of intelligentbuilding, traditional building monitoring systems are established by the way ofwired, which is complicated and unextended. Base on the comparsion of theseveral commonly used wireless communication technologys and the system’sdesign requirements, we proposed the building monitoring system design basedon WiFi and the embedded ARM-Linux platform. In the paper, the mainlyresearch is as follows:First of all, the hardware circuit of the nodes was designed. The buildingMonitoring System adopts WiFi technology and builds the hardware platform.The hardware platform selects S3C2440A manufactured by Samsung as the corecontroller, integrated a variety of sensors (temperature and humidity, infrared,smoke), sound and light alarm devices, power modules and so on. Real-timemonitoring of network connection status and the temperature, humidity, fire andsecurity are transmitted by USB-WiFi network card.Secondly, the software design of the nodes was excuted. Buildation of Linuxoperating system(the porting of Bootloader, Linux kernel and root file system),designation and implementation of the temperature and humidity sensor,USB-WiFi driver program is also introduced. On the basis of these, the paperdesigns the application software development jobs, including UDP socket,communication frame format, CRC and Heartbeat.Then, Monitoring software based on Web technology was designed. By theanalysis of the client pull and server push technology, in order to meet the needsof real-time system, we proposed the real-time web application solutions basedon webSocket protocol, making TCP/IP full-duplex communication between thebrowser and the server. According to the functional requirements of themonitoring center, the system is divided to the login screens, real-time data,real-time curves, real-time alarms and other functional modules, and introducesthe implementation of web server functions in detail. In order to solve theDynamic IP features of monitoring center, the system uses the dynamic DNS service.Finally, the paper shows the operation of the system. The monitoring systemhas the advantages of easy to install, flexible expansion, high reliability,real-time, which achieves the design goal.