Research Of Remote Health Care System Based On Wireless Sensor Network

Since coming into the 21st century, MEMS technology, computer technology,communications,autocontrol theory,EI knowledge and so on all these knowledge's development has bring out a new networks of measurement and controlling——Wireless Sensor Networks.WSN as the new measurement and controlling technology, it is the smart network system which can implement the data collection, data confusion and transfer application. WSN combines the logical information world and true physics world. It can achieve the "Pervasive Computing or Ubiquitous Computing" mode in deed. WSN is a synthesis technology which refers a lot of knowledge, and brings out many study questions of basic theory and engineering technology.Now the study of wireless sensor networks' hardware platform is not widely bring out. Many of companies are using the production of oversea, which extend function is not well and is hardly come the more little consumption. So this paper is mainly analyze and studies the wireless sensor networks node's hardware platform deeply. Base on the study of wireless communication technology,memory technology,sensor technology,embedded computer and power design technologies, combining the newly production of the world. We bring forward the system framework of the wireless sensor networks, and designed the node of low power consumption. This paper describes a system which consists of Zigbee sensors and WLAN is used to support mobility and event management in the medicinal environment. In this system, the design of several sensor nodes and the care base-station were presented. The wireless communication between the sensor nodes and the care base-station used IEEE 802.15.4/Zigbee standard whilst the care base-station and the remote central server was connected in one of the following ways, including computing network, GPRS. The system can be used for remote health care at home or in the hospitals.The author designed the wireless sensor network demonstration system based Zigbee technology. Then it is introduced the designing of the network nodes as the hardware platform, including the testing and surveying unit, signal processing unit, network transmission unit and so on. The examination and survey unit is responsible to monitor physiological information of the patient gathering, adjusting and the data conversion. In this design, the data collection unit mainly takes the pulse sensor as the example. The central processing unit is responsible to control the processing operation, the route agreement, the synchronized localization, the consumption power management, the task management and so on of entire nodes. The wireless transmission unit is responsible to communicate with other nodes, exchange controlling information and receiving and sending data. The CC2420 and the MSP430F149 are used as the main chips of the system. PVDF sensor is used as the information gathering detector to distill the pulse signal which is translated to MSP430 chip through enlarges, the filter, the labor frequency by way of the electric charge falls the wave. Then the signal will be sent to the remote node of the system by the RF module which is built by CC2420 chip. The remote node will send the information to PC. PC will store and analysis the physical data.This demonstration system can realize the basic remote healthy guardianship at present, such as monitoring the pulse of the patient. The demonstration system is composed by the synchronizer and certain nodes, the nodes separately wear on the arms of different assistants. The synchronizer arranges in the far-end quoin of the laboratory to gather every pulse data. The gathering data will be sent to the synchronizer through the automotive organization network, and then the synchronizer will send that to the PC. The result of the experiment is good. Undoubtedly the realization of remote healthy guardianship functions is meaningful for enhancing the discovery rate and rescuing rate of the cardiovascular disease greatly.