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Design of Temperature Detecting and Image Monitoring System Based on ZigBee Technology

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Tutor: ZhouXianZhong
School: Nanjing University
Course: Control Science and Engineering
Keywords: WSNs,ZigBee,CC2430,Temperature Detecting,Image Monitoring
CLC: TP274
Type: Master's thesis
Year:  2012
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ZigBee is a new bidirectional communication technology applied in Wireless Sensor Networks, with the characteristics of short distance, low rate, low cost and low power consumption, etc. It¡¯s called IEEE802.15.4technical standard, the node in the network can work with less energy. The ZigBee wireless temperature detecting network is comprised of ZigBee network and temperature sensors. It can be applied in a certain area for temperature acquisition and monitoring. However, when facing a complex situation (many uncertain reasons to cause temperature change), it is not enough to detect temperature data only for a monitoring system. The supervisor needs to understand the situation further to confirm the reason that caused temperature changed and gives the corresponding processing scheme. The image data is one of the very good judgment bases.In this paper ZigBee network technology is applied to temperature detecting and image monitoring system. The job mainly includes hardware design and software programming of ZigBee nodes and sensor modules. In this system, CC2430is chosen as the wireless chip of the ZigBee node. Besides that, high measurement precision digital temperature sensor DS18B20and CMOS cameras with serial port are selected and used. The software job mainly includes application programming of data acquisition, network formation, wireless communication, serial communication and monitoring interface on PC based on ZigBee2006Z-Stack.The test network is made up of one coordinator and four end devices, they together form a star topology network to implement temperature detecting and image monitoring among the test area. The PC is responsible for sending temperature and image inquiring orders to the coordinator and results displaying. The coordinator is in charge of forwarding orders to the end device nodes. The end device nodes take charge of starting the temperature sensors and cameras to collect data and they will return the query results to the coordinator after that. Test was done in two conditions:one with no obstacle, and another with obstacles and interferences, and test results including network forming and temperature, image data inquiring in different test conditions are given in the end.
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