Greenhouse Irrigation Control System Design And Research Based On ZigBee And Fuzzy PID Technology

Abstract:Water-saving irrigation is a major strategic measure that safeguards the China’s economy, ecology and social sustainable development. Irrigation is not only influenced by different growth and development period of crop, also affected by multitudinous environmental conditions like temperature, humidity, precipitation, evaporation and so for forth, so it is difficult to establish accurate mathematical model. At present, the commonly used irrigation control system mainly works by cable, therefore the cost of systematic installation and maintenance is high. In order to overcome the defects of traditional irrigation methods which is based on cable, has single control parameters and water saving effect is not obvious, etc. The article was based on research and analysis of water-saving irrigation technology at home and abroad, developed a kind of fuzzy PID irrigation control system which based on ZigBee wireless network technology, the system uses fuzzy control technology of intelligent control system and PID control technology of classic control system, it could realize Uniform fine irrigation of crops of different water requirement in different growth periods.The work presented in this paper as following aspects:first was the analysis of intelligent irrigation control technology at home and abroad; Secondly, demonstrating the working principle and overall design scheme of irrigation system, briefly elaborated the composition and system structure of the irrigation system; Third, it elucidated the hardware design of the whole irrigation system via demonstrated designing project, mainly include the design of ZigBee network node structure, soil moisture sensor, RS232serial communication circuit, USB serial interface circuit, JTAG interface circuit, keyboard circuit, power supply circuit as well as128*64LCD driver circuit, etc; Fourth, it adopted the modular design for software program of the irrigation system, which could be easily used for debugging and program modification, primarily include the design of main program CC2530F256of master control chip ZigBee, of program of fuzzy PID control and irrigation system, etc; The fifth was the real-time simulation and debugging of designed software and hardware by the usage of C language and assembly language.The main research results of paper:1. Designed the better fuzzy PID controller to adapt to water-saving irrigation of different crops in different periods by changing the table of fuzzy control rule and adjusting the relevant parameters of the PID system.2. Completed the design of peripheral circuit, program of software and interface of whole irrigation system, achieved the scheduled functions.3. We carried on Simulink simulation and CC2530F256hardware debugging, the results showed that the system of high stability, fast response speed, and cost-saving, which could satisfy the water-saving irrigation of different crops in different periods.