Control Of Greenhouse Environment Parameters Based On Embedded System

Today greenhouse in the world is an important component of agriculture, and it is of the priorities of the modern agricultural development. It could rapidly changing natural conditions for crop growth and artificially creating a suitable environment. The facts that the automation and management system for greenhouse could improve the efficiency of agriculture have been proved in domestic and overseas. In China, the intelligent control of the greenhouse compared with developed countries, there is a large gap. Currently, most of the major environment monitoring and controlling system adopted to domestic equipment greenhouses are imported products which are generally applicable to modern large scale or high-grade greenhouses with their advanced technology, efficient monitoring and controlling while relatively higher price. Meanwhile, a small number of domestic brands are dissatisfying in terms of both technology and control effects. In particular, they are lack of a low-cost intelligent monitoring and control device applicable to small and medium-sized solar greenhouses which are commonly seen in China.In this thesis, combined with the most popular embedded technology and wireless sensor network technology, and according to the current domestic common small and medium-sized sunlight greenhouse environment control demand, the system that designed and realized is a set of facilities agriculture sunlight greenhouse intelligence embedded control system from hardware to software complete solutions.The main research works are as follows:(1) The system designed that based on the wireless sensors to collect all the basic data of the greenhouse and control the parameters of the greenhouse.(2) Structures embedded system hardware platform. Through using embedded system control to incremental PID control algorithm, greenhouse canopy intelligent control system can accurately according to the requirements of the expert system adjust the parameters of the greenhouse.(3) For embedded systems development platform, and developed the system drive and control program, by using cross-platform QT language preparation of the control system interface.(4) Using MATLAB/simulink software simulation, the controller for embedded control system is simulated operation, the test result shows that the controller dynamic response curve effect is good, small overshoots, steady precision is high, can achieve greenhouse canopy ideal control requirements.Finally, the embedded control system is easy to operate, low cost, easy to upgrade hardware and software, and it has friendly interface characteristics are summarized, and points out that the control system is a need to further improve the perfect place.