Micro-irrigation Monitoring System Based On Can Bus And Embedded Linux

At present, there is a serious shortage of water resources in our country, thecontradiction between supply and demand of water resources has become increasinglyprominent. Water for agriculture irigation is relatively inadequate. However, there is lowefficiency of agricultural water use, waste serious situation. which exacerbated the shortageof water resources. The development of water-saving irrigation technology is one of the mostimportant ways to solve the problems of water shortage in agriculture and relieve the waterresources supply and demand contradictions. According to the actual requirements ofprecision agriculture, a micro-irrigation monitoring system based on CAN bus andembedded Linux was designed for the greenhouses of incubators garden in WuquanYangling, to save the farm irrigation water, improve the utilization rate of water resource andachieve the automatic control of micro-irrigation. The main research contents of this thesisare listed as follows:(1) In accordance with the requirements of precision agriculture, The research thoughtand method are determined under the guidance of “On-Demand Irrigation”. The correlationtheories of crop water requirement (irrigation amount) calculation are systematically studied.Reference crop evapotranspiration estimation model with fewer parameters based on BPneural network is applied to calculate the water supply of the crop, In this system cropevapotranspiration can be calculated accurately through the environmental parameters whichcan be obtained easily, to guide the irrigation process scientifically and regulate water statusin the greenhouse environment effectively.(2) Through a field surveys, according to the particularity of the greenhouseenvironment, and combined with the existing conditions in the demonstration zone, theoverall design of the system framework is established from the point of its functionalrequirements. Follow the design principles of low-cost, high reliability and low powerconsumption, the system is divided into five functional modules: data acquisition modulebased on MSP430F169microprocessor, CAN bus adapters based on STC12C5A60S2 single-chip, wireless data communication module based on STM32and data processingmodule based on S3C2440A, and then their hardware and software are designed andimplemented separately.(3) Based on the concept of modular design, the five functional modules of the systemare assembled and tested after the accomplishing the design and debugging of them, andthenthe function of this system has been verified by the results of a running test, In order tomake the system work steadily in a long term, the protection devices and stents for thesystem have been designed.In this thesis, a low-cost, easy-operation, practical micro-irrigation monitoring systemsin the greenhouse is developed through integrated application of CAN bus technology,embedded Linux technology and theoretical knowledge of crop water requirementcalculation. The system can collect the temperature and humidity of the greenhouseautomatically at a specified time, and determine irrigation requirement by theoreticalcalculation according to the crop growth status. Under the effective participation of remoteusers by an expansion module of wireless data communication terminal, then it controls theelectromagnetic valves to irrigate the crop accurately and automatically, build a good cropgrowth condition and improve the utilization rate of water resource for micro-irrigation.Application in demonstration zone proved that, the system is stable and effective, and cancollect information accurately and distributed control stably, it has a bright future inpopularization and application.