Building environment monitoring systems based on wireless sensor network

WU Xiang , ZHU Qianxia , SHAO Lei , FU Jiahong , ZHU Hanyang
(College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China)

Abstract:  In order to meet the lowcost and fastresponse demands of the monitoring system, a wireless location scheme for the elderly based on received signal strength indicator(RSSI) range was proposed with wireless sensor network(WSN) applied to the monitoring system. With the analysis of specific environment and location requirements, the system platform was established with Micaz nodes, and combined with the characteristics of RSSI location, a deployment scheme of micaz nodes under different environment was put forward. In the meantime, an adaptable regional trilateral positioning algorithm was devised. In this scheme, the realtime monitoring of the location of the elderly was achieved. When a physical disorder occurs to an elderly, the location will be rapidly determined to guarantee the safety of the elderly. The validity of the location algorithm was verified through experiments. Research result shows the RSSI based location scheme does make for the timely arrival at the spot of health care workers and the rapid rescue of the elderly.
Key words: monitoring system of elderly; received signal strength indicator(RSSI); location algorithm;wireless sensor network(WSN)