Abstract: As a tropical and subtropical fruit, pitaya is mainly cultivated in southern China. To achieve the goal of growing southern fruits in the north, the paper designs a monitoring system for the greenhouse shed of pitaya in North China, which simulates the southern climate environment suitable for the growth of pitaya based on ZigBee wireless sensor network and OneNET Internet of Things platform. The system integrates ZigBee terminal nodes, ZigBee coordinator, and ZigBee gateway to construct a low-power, self-organizing wireless sensor network. ZigBee terminal nodes collect critical environmental data such as temperature, humidity, light intensity, and soil moisture, and transmit those data to the coordinator through the ZigBee network. As the network center, the coordinator performs preliminary processing on the data and then uploads it to the OneNET cloud platform through the ZigBee gateway. The OneNET cloud platform provides data storage, data analysis, and remote monitoring services. Based on the preset optimal conditions for pitaya growth, it automatically controls environmental regulation equipment such as supplementary lighting lamps, warm air blowers, fans, water pumps, and atomizers, enabling real-time monitoring and intelligent control of the pitaya growth environment. The application of the system ensures that pitaya grows in the most suitable environment, making it possible to cultivate pitaya in North China. A stable growing environment is beneficial to the growth and development of pitaya, leading to a more symmetrical fruit shape, more vibrant color, and an enhanced taste. System users can view the environmental conditions of the greenhouse in real-time through the OneNET cloud platform's web page and WeChat Mini Program, and remotely control the environmental regulation equipment in the greenhouse as needed. The system has the advantages of high real-time performance, low power consumption, strong intelligence, and good scalability, effectively solving the problem of environmental control in the process of cultivating southern fruits in the north.

Key words: pitaya, monitoring system, ZigBee, OneNET, wechat mini program