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ARM-based Intelligent Irrigation Control System

In the 7 or so, does not require temperature compensation. Output I / o relay drive circuit is mainly used for water pumps, fertilizer control valve, control valve and the irrigation site acid electromagnetic valve control. 3 Control system software 3.1 # Clinux linux operating system migration with outstanding performance, free and open source code, etc., to win the favor of many embedded developers. In the past did not use any operating system embedded programming,[link widoczny dla zalogowanych], compared with mature, efficient,[link widoczny dla zalogowanych], reliable,[link widoczny dla zalogowanych], modular and easy to configure the 26 ARM-based smart irrigation control system Haowei Lin Peng Xiwei Gengqing Bo Linux operating system to develop such applications, further improve efficiency,[link widoczny dla zalogowanych], enhance portability. t ~ Clinux is no memory management unit used in the Microprocessor MMU derivative Linux operating system. tlClinux support multitasking, it retained the vast majority of conventional advantages of Linux operating system, but its core is much smaller than the conventional Linux kernel. Therefore, the system uses the / ~ Clinux operating system, the transplant can be divided into the following steps: (1) Check whether the development board will work. (2) burned into the boot code BootLoader. (3) equipped with a Linux operating system, PC, create Clinux development environment, configuration zClinux kernel; through the BootLoader Flash programming options in the generated compressed kernel zlmage downloaded to Flash in 0x000l0000 address and configuration file generated Clinux system; the file system romfs. img in the same program the Flash through the BootLoader option to download the Flash in the 0x00100000 address; this point, ~ Clinux has been transplanted to the main controller. To the master controller power, either through the control board jumper settings to select the direct start after power Clinux operating system, can also choose to first enter the Boot-Loader, and then start the system by selecting StartzClinux option. 3.2 The control system software control system software applications include core control module program, man-machine interface state parameters display module and work procedures, communication module program, and system-related device driver module procedures. Irrigation control module program main function is to complete the irrigation fluid flow control, irrigation control EC solution concentration and pH control the pH value of the operation and control of electromagnetic irrigation site. Irrigation control program is divided into automatic operation and manual operation in two ways. Run automatically when the day's task will be pre-set irrigation irrigation parameters (such as traffic, time interval, irrigation frequency, set parameters such as EC and pH value) automatically and manually run time, each must be pre-irrigation set of irrigation parameters, executing a task, the next task of the implementation of irrigation, but also reset. Of irrigation fluid pH, ion concentration and the size of the EC regulation is controlled by PWM proportional valve to complete; the SSCA4BOX microprocessor built-in PWM module, the module output by changing the PWM duty cycle, that is, to achieve continuous adjustment of proportional valve . Man-machine interface state parameters and work procedures are completed interactive display module design and system operation menu display of the work of state parameters. Human-computer interaction, including irrigation parameter settings menu, auto run option, manually run the option, on irrigation data query; parameter display system status including state of the solenoid valve irrigation site, EC concentration, pH, total irrigation flow and alarm . Communication module program through the serial port driver to complete the preparation of uART data communication with the PC, to remote control and data logging. LCD display and key input operation through the device driver module program to complete. 4 Experimental results and conclusions of intelligent irrigation control system is the main control parameters of the cumulative flow of irrigation fluid, irrigation sites solenoid valve, irrigation fluid ion concentration and pH value of pH, EC control. EC of irrigation fluid ion concentration and pH value of the control of pH, a large delay, large inertia of the process control, this conventional P1D and compensation delay of the combination of Smith predictor control method. EC of irrigation fluid concentration of control,[link widoczny dla zalogowanych], for example, the control system block diagram shown in Figure 3. EC values of the control of ion concentration experimental step response curves shown in Figure 4, steady-state control accuracy of 0.01, settling time less than 200s, fully meet the irrigation system on the ion concentration control requirements of EC values. 3 �� O; 2.5 pen 20 Qu 10 Figure 1.5 Suwa concentration control system block diagram of 3EC