A Research On Lighting Intensity Monitoring And Control System For Plant In Greenhouse Based On Wireless Sensor Network Technology

Into the 21st century, China's agricultural situation there has been a fundamental change. The agricultural production entered the period of main dependence of science and technology to improve the quality of agricultural product, the fast adjustment of structure, the increase of farmer's income and agricultural overall benefit, the improvement of ecological environment as well as vigorously enhances the agricultural international competition capability. The greenhouse technology has been realized as the important way of this transformation, and the development of intelligent environmental monitoring system for greenhouse is extremely essential.Based on searching massive domestic and foreign reference information, this article has overviewed the current status of the world's greenhouse technology in recent years, summarized the problems of the existing systems. It has focused on researching the light monitoring system which is based on WSN and the related theory and application.The author has absorbed the theoretical result and the empirical data, build the"greenhouse light control model"for analysis and present the main idea of light intensity control algorithm. Further more, it uses mathematical calculations to prove the stability of this algorithm.Then the article introduces the overall structure of system's function, the design of hardware functional module and process of software, and test of system effect. In aspect of the overall framework, it presents the main function of system, and analyzes the key-technology including the energy-saving strategy based on radio wake-up mechanism and the network topology control based on LEACH algorithm and so on. in aspect of hardware, it maintains the ideas of design, the principle circuit, and the implementation methods; in addition, under the condition of meeting the requirement of system, it takes saving the whole cost into consideration and uses the Low-cost, low-power-consumption components as many as possible. And in aspect of software, it highlights the platform of Code Warrior, the overall software design idea, and the functional flow chart of each part of module, and then describes the software implementation ways of related algorithm and strategy.In the next step, the author does the system's test, using the real greenhouse for test's location and the real plant for test's sample. The test's result is satisfied and the precision is matched the expected demand as well as the plant's growing effect. And the result prove that the correctness and feasibility of system are correct and the its function's stability and practicality are reliable, and give a further objective proof of system's positive effect to plant.In the end, this document summarizes and introduces the main work , explained this article characteristic and significance; at the same time, by consulting the feedback data from test result, it points out the insufficiency and the improvement mentality of system design, has built the foundation for the next step further research.