Research And Application Of Intelligent Greenhouse Based On ZigBee And Power Line Carrier Technology

To solve the problems of complex routing installation, incomplete data acquisition, less flexibility of system, and not intelligent decision-making platform in traditional intelligent greenhouse, an intelligent greenhouse monitoring system based on wireless sensor network and intelligent management platform was presented according to the concept of IOT.According to the statue of greenhouse development, the paper designed the framework of intelligent greenhouse control system which used the advanced mature components and technology to design and develop. The system built the tree type wireless sensor network based on ZigBee technology and designed collection node, gateway nodes, relay nodes and control nodes based on STM32W108. The data acquisition nodes had self-powered internal battery, with low power consumption hardware design and software energy-saving mechanism. The system had the characteristics of high integration and strong extension, with multiple USB extended port used to extend the other types of sensors besides the integrated temperature-humidity sensor and light intensity sensor. The high definition images(1080p) of crop leaves texture only transmitted by power line were realized to warn diseases and pests early by introduction of power line communication technology in the system. According to the system requirement, the paper developed a smart greenhouse management platform, which was suitable for the system, and provided the design framework and display of the database.The paper designed the soil moisture sensor based on the STM32F103 and it could match the acquisition node perfectly. The paper introduced the general design idea, including the ADC correction and the low power design. After the completion of the development, we tested and analysed the soil moisture sensor, and provided the configurable parameters and the interaction protocol of I2 C. The results were stable and reliable.Finally, the system was tested in a 2,400 square meters greenhouse with three-dimensional hybrid of strawberries and Dendrobium officinale. The data acquisition nodes were set in the random position of the greenhouse and counted the data loss, which the result of the data drop rate below 1‰. According to the actual working conditions, the voltage of data acquisition nodes decreased 400 mv in 30 days, and the nodes charged by movable power sources can work more than 5 months with full power. Therefore, the nodes’ characteristics of stability and power can satisfy the system requirements.