Development Of An Embedded Greenhouse Control System

With the raise requirements of improving quality of agricultural product and the demand of anti-season production, crop cultivation method that based on modern greenhouse increasingly manifest its importance. The greenhouse environmental control technology will unify with the industrialization to take the mature product to the market. Aiming at the need of industrialization, an embedded technology based automatic greenhouse control system was designed which could control the environment parameter of temperature, humidity, illumination and carbon dioxide density.It was a distributed auto-control system, which included the main computer and greenhouse functional modules. The functional modules hung on the RS485 bus by the means of node to transmit data with the main computer, the number of which may adjust freely according to the greenhouse scale size as well as the control content. In this dissertation, the software and hardware design of the greenhouse control system had been carried on in detail.The main computer which use S3C2410A as the processor took Windows CE embedded operating system to construct software platform.It was responsible for the greenhouse environment overall control, including the automatic control strategy's execution, the greenhouse control command's transmission, the greenhouse environment parameter's real-time display and the data preservation, and the man-machine interaction. The application software programming was based on the MFC dialog.The greenhouse functional modules which took MCU as the processor, implemented the greenhouse environment sensor's real-time reading and the greenhouse control actuating equipment's monitoring. The function of modules included analog signal (A/D) collection, digital signal collection on-off signal output.