As high-tech technologies are gradually integrated into traditional agricultural and sideline industries, greenhouse cultivation has become a way of producing off-season crops. The design of the greenhouse monitoring and control system based on S3C2410 processor is introduced, and a remote monitoring system for embedded Boa server based on ARM9 processor is designed. The user monitors the environment in the greenhouse through Ethernet and some devices. Control to improve the safety and reliability of remote machines.
With the rapid development of the economy and the advancement of science and technology, people's living standards have been continuously improved, the requirements for quality of life have become higher and higher, and the demand for spring tea has also increased greatly. The supply of spring tea is in short supply, and the tea tree cultivation in the greenhouse is proposed to alleviate the demand for spring tea.
With the rise of Internet technology, Web-based applications have become the mainstream in the management and interaction of embedded devices. This program structure is also a familiar B/S structure, that is, running an embedded device. A web server that supports scripting or CGI functions can generate dynamic pages. It is only necessary to manage and monitor embedded devices through a web browser on the user side, which is very convenient and practical.
For the cultivation of greenhouse tea trees, it is necessary to maintain a relatively excellent growth environment. In this paper, the controlled device is connected to the Internet through the embedded Web server, and the user can remotely monitor and control the monitoring device through the IE browser.
1 System introduction
The greenhouse tea tree growth monitoring system designed in this paper is shown in Figure 1.
The system adopts 32-bit ARM9 processor S3C2410 as the main controller. All kinds of sensors transmit the collected signals to the processor and process them to the processor. When the current environment variable does not meet the preset parameters, the processor will respond accordingly. Operational processing. In order to achieve remote monitoring, the embedded Web server connects the monitoring device to the Internet through the Boa server under Linux. The user can remotely monitor and control the controlled device through the IE browser.
2 system hardware design
The embedded Web server system can not only collect, process and control the field data, but also access the web pages on the embedded system through the web browser on the PC. In the login interface, you need to enter a user name and password. When the user name and password are correct, you can enter the monitoring interface.
The greenhouse tea tree culture monitoring system is mainly composed of an ARM main control platform, a sensor data acquisition module, a control module, and a host computer. The system hardware structure is shown in Figure 2.
2.1 S3C2410 processor
The S3C2410 processor is a 32-bit ARM microprocessor based on the ARM920T core and AMBA bus from Samsung. Use 0.18μm CMOS standard macro cell and memory cell process; 16 KB instruction cache and 16 KB data cache, support MMU, can run WinCE, Linux and other operating systems; integrated LCD, UART, I2C, SPI, I2S, USB, SD control On-chip peripherals such as devices; support for inexpensive NAND FLASH boot; clocks up to 203 MHz.
2.2 Sensor module
The DHT11 digital temperature and humidity sensor is a temperature and humidity composite sensor with a calibrated digital signal output. These calibration coefficients are called internally during the processing of the detection signal. The single-wire serial interface makes system integration easy and fast. With its ultra-small size and extremely low power consumption, this sensor has the advantages of fast response, strong anti-interference ability and high cost performance.
The ESM-CO2 protective carbon dioxide transmitter is designed for use in a variety of high-humidity applications such as agriculture based on imported infrared dual-beam carbon dioxide sensors. The imported infrared dual-beam CO2 sensor, serial interface, can be easily connected to other devices. Reliability and stability are relatively high.
The HA2003 illumination sensor uses a photoelectric conversion module to convert the light intensity value into a voltage value, and then converts the voltage value to 0 to 2 V or 4 to 20 mA through a conditioning circuit; the high-precision light intensity measurement volume is small, and the IP65 protection level is designed. The sensor is robust and resistant to corrosion. It can be used for voltage or current output of less than 1 s. The current output has no signal attenuation when transmitted over long cables. Can be used very well for the measurement of greenhouse light.
2.3 Control Module
For temperature control: The regulating device automatically warms and cools at the upper and lower limits set. At present, the cooling device is a refrigerator. When the temperature is higher than the upper limit, the refrigerator is started. When the temperature reaches the lower limit, the cooling is stopped. The upper and lower limits of the 3 to 4 groups can be controlled at different times within 24 hours, and kept repeated every day until the parameters are changed. Start the timer at the same time of cooling, control the cooling time and intermittent time; start humidification below the lower limit, humidify to the upper limit to stop humidification, if the humidity is higher than the upper limit, start the exhaust, if the alarm is higher than the upper limit for a long time.
Control of carbon dioxide: When the indoor carbon dioxide concentration is lower than the set lower limit, the carbon dioxide vent valve is opened and carbon dioxide is introduced into the chamber. When the concentration of carbon dioxide reaches the set upper limit, the carbon dioxide vent valve is closed.
Control of lighting: When the light is insufficient, turn on the fluorescent light, increase the light, ensure the light intensity required for photosynthesis, and give the tea tree leaves plenty of photosynthesis time.
Through this intelligent control, the manpower is greatly reduced, the burden is reduced for the staff, and it is not necessary to stay in the greenhouse from time to time, saving time.
3 system software design
The system software design flow chart is shown in Figure 3.
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