Key Technology Of Wireless Sensor Network Node Based On Tobacco Data Acquisition

Sensor network, which is made by the convergence of sensor, micro-electro-mechanism system and networks technologies, is a novel technology about acquiring and processing information. It can be real-time monitoring, sensing, collecting and processing some kind information of subject that to be monitored, it has very broad application prospects, and is one of the focuses of the current international concerns, multidisciplinary cross highly forefront research, and as the technology practical progress gradually, it has been applied specifically in the areas of environmental monitoring.Networked sensor design will trend to be app1ication specific,rather than general purpose,and carry only the available hardware support actua11y need for the application. As there is a wide range of potential app1ications,the variation in physical devices is likely to be large. The analysis and comparison of the existing mainstream wireless sensor network node platform shows that their common and each unique design idea, and the analysis in depth of some circuit of Mica2 platform. With the wide application of the wireless sensor network, the change formed of the node is enormous, the embedded operating system on the wireless sensor network node must possess good transplantation, and therefore its transplantation research is of great significance.This paper is based on designing requirement of node software that applied in monitoring tobacco, carry on deep research in software design, classify and summarize the existing wireless sensor network operating system, tracking the progress of the domestic and international research in the field, focus on the classic TinyOS embedded operating system of wireless sensor networks, including the component model, the scheduling strategy. Analyzed and explained tne compiler ncc of nesC language, then analyzed and studied its process of compiling. On the foundation of further investigating TinyOS commoponent framework, have given an idea of transplanted TinyOS to the same microcontroller but different platforms of peripheral circuit or to the different microcontrollers platform, have realized transplant TinyOS to GAINS3. It analyzed that the scheduling strategy of TinyOS, improve FIFO deployment mechanism of TinyOS-1.x, rewrite some scheduling functions, make TinyOS-1.x support simple priority scheduling, has improved real-time character.In addition using nesC language to write the drive of the sensor board after understanding SHT7x chip of GS003 sensor board, have realized the collection of high-accuracy temperature and humidity information, including 14/12bit and 12/8bit two kinds of precision. Have study nesC language, has written application program that used SHT7x sensor to gather temperature and humidity information and send to assemble node through the wireless interface regularly, realized to send some information that received from wireless interface to PC by serial port in assemble node. A VC ++ program will read the data from serial port and display in PC. The experiment proves the whole system work stable, the data gathered are accurate in time.