Research Of Greenhouse Temperature And Humidity Monitoring System Based On Wireless Sensor Networks

In modern large-sized greenhouse, one of the key research subjects is to use wireless measurement network. Adopting wireless sensor network technology, the greenhouse monitoring system can solves some problems existing in cable network and manual measurement, realizes network information automatic management, and improve the level of facility agricultural production.Firstly, according to the design requirements of hardware and software system, this dissertation discusses the research scheme of greenhouses monitoring system based on wireless sensor network. On this basis, the research focuses on the hardware design of the node system which takes temperature and humidity sensor, AVR ATmega128L and CC2400 as the components, and the transplantation of TinyOS operating system.Secondly,in order to reduce the data redundancies and improve the measurement precision, the basic theories and methods of the data fusion technology in wireless sensor networks is researched that an improved adaptive data fusion algorithm has been studied. This algorithm gets the unbiased estimates for every node via iterative method based on the node testing data, and makes the Euclidean distance between nodes and estimate as the reliability, more accurate results are obtained through the fusion processing.Finally,in order to obtain the real-time data by wireless sensor network, a method based on middleware is introduced for monitoring software of wireless sensor network in LabVIEW. The software reads XML socket to obtain wireless sensor network data that through standard general interface provided by middleware. Consequently, the system visual management can be convenient realized.