Intelligent greenhouse:

     Moveable skylights and other components of the greenhouse Intelligent greenhouse, usually referred to as a continuous greenhouse or modern greenhouse, it is the type of facility agriculture, has an integrated environmental control system, the use of which can directly regulate the indoor temperature, light, water, fertilizer, gas, and many other factors, which can achieve a high yield throughout the year, steadily fine vegetables, flowers, and good economic efficiency. With the rapid development of vegetable greenhouse construction in recent years, intelligent greenhouse has brought impetus to agricultural development. Intelligent greenhouse control is generally composed of three major components: signal acquisition system, central computer, control system.

Control system:

     Factors such as temperature, humidity, light intensity and soil temperature and moisture content in the greenhouse greenhouse play a key role in the growth of crops in the greenhouse. Greenhouse automation control system is based on PLC as the core, using the computer distributed network control structure of the greenhouse air temperature, soil temperature, relative humidity, CO2 concentration, soil moisture, light intensity, water flow, and PH value, EC value and other parameters of real-time automatic adjustment, detection, to create a good environment for plant growth, so that the environment in the greenhouse close to the ideal value of the artificial envisioned to meet the greenhouse crop The environment in the greenhouse is close to the ideal value envisioned by man, so as to meet the needs of greenhouse crop growth and development.    [2] It is suitable for sites such as seedling breeding, high-yield planting, and cultivation of valuable flowers to increase the output of greenhouse products and improve labor productivity. It is a successful example of high-tech achievements serving the modern agriculture of large-scale production. 

    Computer operators according to planting crops required data and control parameters into the computer, the system can realize unmanned automatic operation, the computer collected data accurate display, statistics, for expert decision-making to provide a reliable basis. The control cabinet is equipped with manual/automatic switch, which can be operated manually when necessary.

System principle:

      Greenhouse greenhouse automation control system is based on the greenhouse greenhouse temperature and humidity, soil moisture, soil temperature and other sensors collected information, the use of RS485 bus will be sent to the sensor information to 485 to 232 converter, received on the upper computer for display, alarm, query. The monitoring center will receive the sampling data in the form of table display and storage, and then compare it with the set alarm value, if the measured value is out of the set range, it will display the alarm through the screen or voice alarm, and print the record. At the same time, the monitoring center can send control instructions to the on-site controller, the monitor according to the instructions to control fans, pumps and other equipment for cooling and dehumidification and other operations to ensure that the greenhouse crop growth environment. The monitoring center can also start the sound and light alarm device on the on-site monitor through the alarm instruction to notify the greenhouse management personnel to take appropriate measures to ensure that the environment in the greenhouse is normal.

      Application of Internet of Things Technology in Intelligent Greenhouse 

     In fact, IoT technology is the aggregation and integrated application of various perception technologies, modern network technologies and artificial intelligence and automation technologies.

     In the greenhouse environment, a single greenhouse can utilize IoT technology to become a measurement and control area of wireless sensor network, using different sensor nodes and nodes with simple actuators, such as fans, low-voltage motors, valves, and other actuators with low working currents, to form a wireless network to measure the substrate humidity, composition, pH, and temperature, as well as the air humidity, air pressure, light intensity, and carbon dioxide concentration, and then through model analysis, automatically regulate the substrate humidity, composition, and temperature. The greenhouse environment is then automatically regulated through model analysis, and irrigation and fertilization operations are controlled to obtain optimal conditions for plant growth.

     For agricultural parks with greenhouses, IOT can also realize automatic information detection and control. Equipped with wireless sensor nodes, each wireless sensor node can monitor various environmental parameters. By receiving the data sent by wireless sensing convergence node, storage, display and data management, it can realize the acquisition, management and analysis processing of all the base test point information, and display it to each greenhouse user in the form of intuitive charts and curves, and at the same time, provide all kinds of acoustic and optical alarm information and SMS alarm information according to the needs of planting plants, so as to realize the greenhouse intensification and networked remote management. 

     In addition, IOT technology can be applied to different stages of greenhouse production. In the greenhouse ready to put into production stage, through the arrangement of various types of sensors in the greenhouse, you can real-time analysis of the greenhouse internal environment information, so as to better select the appropriate varieties of planting; in the production stage, practitioners can use the Internet of Things technology means to collect the greenhouse temperature, humidity and other types of information to realize the fine management, such as the sunshade net opening and closing time, can be based on the temperature of the greenhouse, light and other information to the sensory For example, the opening and closing time of the sunshade net can be sensed according to the temperature and light information in the greenhouse, and the starting time of the heating system can be regulated according to the collected temperature information.