Research Of Greenhouse Intelligent Irrigation System Based On Fuzzy PID Control

China's water resources account for only 6% of the world's total,which is more scarce than the cultivated land resources.The shortage of water resources has become a serious obstacle to the sustainable development of our national economy.At the same time,the development of industrialization,the increase of population,the waste of water resources and pollution have aggravated this decline,and the shortage of water resources has threatened our country.Food security has become an important factor that restricts the sustainable development of agriculture and endangers national long term public order.The state and government are actively seeking to change the effective ways of changing the traditional agricultural structure.The development of intelligent irrigation technology provides the possibility for the adjustment and reform of the agricultural structure.Intelligent irrigation technology is to control each link of irrigation efficiently through automatic testing device.It can save water while ensuring the normal growth of plants,fundamentally change the traditional irrigation mode and achieve precision irrigation.The development of intelligent irrigation technology has become the only way to achieve agricultural modernization and sustained economic growth in China.In this paper,the fuzzy PID irrigation controller is designed in the greenhouse environment to control the soil moisture in the growing period of melon,to find out the optimum soil moisture range of the melon in the literature,to formulate the fuzzy PID control rule table,to analyze the actual situation of the greenhouse,to make the irrigation mode,and to be able to save water at the same time to the maximum limit of drip irrigation.Enough to ensure the normal growth and development of the plant,build the system hardware platform,the MCU STM32 as the centralized control station of the system,design each module circuit of the hardware module,introduce the fuzzy PID control algorithm into the single chip microcomputer using the look-up table method,and make the corresponding action by monitoring the change of soil moisture,and control the opening and closing of the solenoid valve.Automatic irrigation.In order to verify the superiority of the fuzzy PID algorithm proposed in this paper,a fuzzy control irrigation system and a fuzzy control irrigation system are set up by using Simulink to build a simulation platform for the intelligent irrigation of greenhouse and to analyze the water requirement of the Melon during the growing period and to ignore the influence of the environment on the change of soil water.Compared with the PID irrigation system,the simulation curve shows that the simulation curve shows that the fuzzy PID control error can be stable in the 5% range,the overshoot amount is 6.7% and the simulation curve converges long 80 s,which can meet the requirements of water saving irrigation in greenhouse.The controller is robust to nonlinear and pure time-delay systems,with high steady-state accuracy and good control effect.It has a certain reference significance for the construction of the experimental platform and the selection of irrigation controller strategy.