The Design And Application Of WSN Node Based On MSP430 And UZ2400

With the rapid development of micro-electro-mechanical system, on-chip system, wireless communication system and low-power embedded technology. Wireless sensor networks(WSN) appears, and with its low power consumption, low cost, distributed and self-organizing, it brings a new information revolution. WSN is made up of a great deal of low-cost subminiature sensor nodes, which are set in the monitoring area. It can make a many-jumps network by the wireless communication by itself.WSN has many kinds of sensors, including seismic exploration, electromagnetism, temperature, humidity, noise, light intensity, pressure, soil ingredients and speed, size, direction of moving object in various phenomena.In the report of Business Week and Technology Review about development of technology in future, WSN will be one of the 21 most influential technology in the 21st century and the top 10 technology to change the world. And sensor network, plastic electronics and bionic organs are also called three global high-tech industry in the future.This thesis introduces zigbee background, protocol structure and network topology. A wireless sensor network universal node was designed in this paper in order to design sensor that can be used for different demands. The universal node is hardware-based on the low-power MSP430F1611 and UZ2400. For the most expansibility, there are 32 pins for input and output.There are five chapters in this paper, organized as follows: The first chapter introduces the concept, characteristic and key technology of WSN. It can be widely applied in the military field, health care, environmental monitoring and intelligent buildings, etc.In the second chapter, we design a universal WSN node, including four basic units: microprocessor module, RF transceiver module, power management module and universal interface module. We choose the ultra-low power MSP430F1611 for the processor, which is used for collecting data and computing between the universal nodes. And we choose the low-power UZ2400 which meets the standard of 2.4GHz IEEE802.15.4 for RF transceiver module. The microprocessor module communicates with RF transceiver module by SPI. For its most expansibility, there are 32 pins for input and output.The third chapter introduces the standard of wireless communication—the concept of zigbee. Zigbee is the pronoun of IEEE802.15.4 protocol. It is a kind of short-range, low-rate, low-power and self-organization wireless communication technology. Moreover, it is simple, high-security and license-free band.The fourth chapter introduces IAR Embedded Workbench, which is the software to design C language program for MSP430F1611 and UZ2400. Use the designed WSN node for practical application. With infrared range-finder, design Prevent- Myopia-Alarm, transform voltage analog signals into digital signal. According to the distance between children's eyes and books, it will give different signal and trigger a buzzer, and the signal will be sent to the other node through wireless networks. The parents can get it and notice their children. The second application is the positioning control of the robot car. In this experiment based on wireless location technology, packet (including ID & signal power) will be sent to the robot car from distributed beacons. We can calculate the coordinates of the robot car, and according to the coordinates, the direction of the robot car will be set, besides the robot car has the function of evading obstacles.The fifth chapter concludes the main researching work, the result of the paper and the next step of the research in the future.