Research on the Role of Leaf Humidity Sensors in Automatic Control Systems

Plants such as flowers, nursery stock and off-season vegetables have optimum humidity (soil moisture, leaf moisture, air humidity), temperature, illuminance, and carbon dioxide content suitable for rapid growth during different growth periods. When the weather conditions cannot be met When these requirements are met, they will grow poorly and may even wither, rot, or die. If the greenhouse is intelligently controlled so that its climate parameters are always in the best condition for plant growth, it will greatly increase its yield and quality. Currently, The few applications of intelligent control of agricultural greenhouses in China are mainly due to the fact that such equipment is expensive and not suitable for national conditions. In addition, because the same plant has different requirements for its optimal climate during different growth periods, the different plants in the same growing season Good weather conditions are also different. Even if the greenhouse can achieve full automation control, but the specific control parameters but also artificially set, and the operator is not necessarily an agricultural expert, the set temperature and humidity parameters are the best parameters of the plant growth period This depends entirely on the operator's level of agricultural science and technology, so the operator directly affects the effectiveness of the automatic control system.

We started from the growth needs of plants, focusing on cultivating and planting precious flowers, seedlings, and off-season vegetables. We have developed an automatic control system for agricultural planting greenhouses. This system has installed/agricultural expert decision-making and consulting software that can be used in time for users. Provide the best climate parameters and cultivation techniques and measures needed for growing various crops in greenhouses at different times, providing technical assistance and real-time guidance for users who do not understand agricultural technology. The system is highly flexible, compatible, and inexpensive. It is suitable for China's existing middle and low-grade greenhouses to carry out / intelligent transformation of 0, in line with the level of farmers' consumption, suitable for China's national conditions. The hardware of the complete system includes: temperature, humidity, light intensity and carbon dioxide content 4 kinds of climate parameters acquisition sensors, host, Climate automatic controllers, communication lines, control actuators, etc., mainly include soil moisture sensors, leaf surface humidity sensors, air temperature and humidity integrated sensors, light intensity sensors, and CO2 sensors, which are information sources of the monitoring system and are related to the entire system. Testing, data analysis and control reliability and accuracy.


The automatic control system composed of leaf surface humidity sensors and other related sensors can automatically control the environmental climate of high-grade flowers, nurseries, vegetable greenhouses and other agricultural planting greenhouses, and can also automatically detect and control the environment of grain storage, cold storage, laboratories, and production workshops. Climate; both multi-function and automatic control, and each function can be controlled individually. Different control methods can be adopted according to the number, size and characteristics of the controlled greenhouses. They are simple, flexible, inexpensive and practical. Meet the needs of different users.

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