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In order to achieve centralized management, the temperature and humidity monitor is connected to the PC through the RS-232 interface in each greenhouse. The PC manages the temperature and humidity control subsystems in each large greenhouse, that is, the user can input the temperature and humidity data (1 h temperature and humidity values ​​within 1 year) from the agricultural experts' experience based on the crops grown in the greenhouse. Send a set of data to the greenhouse temperature and humidity control subsystem. The temperature and humidity control subsystem intelligently controls the temperature and humidity in the greenhouse according to the data from the PC. In addition, the subsystem can automatically record the temperature and humidity of the actual environment in the greenhouse while controlling the temperature and humidity in the greenhouse, and send it to the PC through RS-232 as data data for future agricultural experts to develop more reasonable crops. Growing temperature and humidity data as an ideal value for the next cycle enables the PC to better manage and control the temperature and humidity control subsystems in each greenhouse.
Since the objects to be controlled are powerful electric devices such as motors, solenoid valves, and electromagnetic switches, and the environment in which the controller is used is rather harsh, in order to improve the reliability of control, the entire controller is divided into two major modules:)) The main control module and I/O interface module. The main control module includes: CPU module, data acquisition module, data storage module, keyboard and display module, which are all weak modules. The I/O interface module includes a control output module, a status input module, and a clock module, which are related to strong power and have interference. The strong electric module and the weak electric module are respectively arranged on two circuit boards, which can reduce the interference of the strong electric power on the weak electric power and improve the reliability.
The temperature and humidity process control system is a widely used computer controller. The temperature and humidity monitor has the advantages of simple hardware structure, low price, convenient use, disassembling and maintenance, good temperature and humidity data stability, etc., and is an alternative to traditional temperature and humidity. The ideal system of control mode can be used for automatic control of other temperature and humidity environments and has a good application prospect.
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Temperature and humidity monitor based on empirical data temperature and humidity process control system
With the development of agricultural production, greenhouse cultivation has become more and more popular. At present, there are still some technical problems in temperature and humidity control in middle and low-grade greenhouses: The influence of electromagnetic interference on analog signals reflecting changes in temperature and humidity cannot be completely eliminated; as the temperature and humidity points increase, there are too many terminals in the shed, resulting in The installation and maintenance of the system are more difficult and the failure rate is increased. Generally, a controller that can only set a single temperature and humidity is used. Since the temperature and humidity requirements of the environment within one day of the crop are different, the user must constantly adjust the setting value of the controller. It is difficult to meet the requirements of modern agricultural production. In some high-grade greenhouses, imported complete sets of control equipment are used, which are powerful, but the prices are quite high and the economic benefits are too low. Therefore, there is a need to develop a temperature and humidity control system that is applicable to existing greenhouses, is inexpensive, and has a reliable system. The use of temperature and humidity monitors in the current greenhouse is relatively common, which also means that the relevant functions and advantages of the instrument are worthy of recognition.