Design Of Site Environment Controller For Sanqi Planting

With the development of agriculture automation, the traditional way ofgreenhouse monitoring most using artificial or wired monitoring methods, has beenunable to meet the requirements of modern agriculture. In recent years, computertechnology, mobile communication technology has entered a stage of rapiddevelopment. With the popularity of the third generation mobile communicationtechnology in our country,3G has been widely used. Compared with the traditionalway of data transmission,3G technology transmission distance regardless of locationlimit, high transmission speed, and con can transmit video and data information.Sanqi requires very high growth environment as a precious Chinese herbal medicine.Through the control of greenhouse environment, it is important to improve the yieldand increase the economicThis thesis first describes the working principle of greenhouse monitoringsystem and the development at home and aboard, and proposes the goal andsignificance of this research. Then in-depth and analysis several key technical pointsin the process growth of sanqi which need to be solved, and put forward a wirelessnetwork based on3G communication monitoring system. The system not only has ahigh performance to price, but also has low power consumption, real-time,customized and flexible, and easy expansion interface advantages of small size. Theoverall framework of the program into the system from the bottom to the top isdivided into the system hardware layer, system software layer and applicationsoftware layer.In the hardware layer, the system is modularly designed with S3C2440A chipsystem as the core processing unit for running Linux system and the completion ofdata processing. By analyzing S3C2440A core and on-chip system peripherals, andthen expand the necessary system peripheral interface circuit and power circuit tocomplete the hardware design of the monitoring system.In the operating system layer, an embedded Linux operating system is used inthis design. Compared with other embedded operating systems, Linux has bettermulti-thread scheduling strategy and process management mechanism, the kernel can be customized, and you can achieve a variety of complex functions. The thesisdescribes the u-boot boot code and Linux kernel transplantation, by analyzing theLinux kernel source code, written in the bottom associated with hardware drivers,complete the building of system software platform.In the linux application software layer, this thesis uses uC/GUI basic graphicslibrary to design the interactive interface. And according to the characteristics of thesystem, using Linux multithreaded programming approach to achieve theenvironmental data collected at the scene of Sanqi monitoring system, IO controlenvironmental regulation and network communications, and other functions.