Design And Implementation Of Environmental Monitoring System Based On ZigBee And NB-IoT

The unattended automatic monitoring system of environment data has practical needs and its research is of great necessity.This thesis intends to use air detection,water quality detection,temperature and humidity and light intensity as an example for data collection,and then form a wireless sensor network through the Zigbee wireless transmission module.The sensor network,which is conducted by ZigBee-NB-IoT gateway,finally sends data to the user management cloud platform via the NB-IoT base station.The major work of this paper is as follows:1.Comparing and summarizing the development and advantages of ZigBee technology and NB-IoT technology through Document research and market research.2.Designing a scheme based on ZigBee and NB-IoT heterogeneous network.The data collection wireless sensor network uses ZigBee network.The communication between heterogeneous networks is implemented by the ZigBee-NB-IoT gateway module.The gateway master uses 32-bit processor STM32 whose core is Cortex-M3 as the master.After those above,the communication between ZigBee and NB-IoT communication module is realized.The final data is sent to the user management cloud platform via the NB-IoT base station.3.The hardware design and implementation of the environmental monitoring system have been completed.The circuit and acquisition node module of the access system for digital and analog sensors are designed and manufactured.ZigBee communication module and gateway interface circuit connecting STM32 are designed.The circuit to connect BC95 which is used to NB-Io T wireless communication module is designed,with STM32 and SIM card.4.Adding NB-IoT devices to the cloud platform and configure network access,data transmission methods,and device properties in order to display real-time environmental data on the cloud platform.5.Use the software development platform to test and optimize the wireless sensor network program.The monitoring of environmental data in a test area where is simulated.In summary,the environment monitoring system based on ZigBee and NB-IoT can operate stably,and and monitor data reliably.Also,the system is simple to operate,easy to maintain,and has a variety of applicable scenarios,with unlimited transmission distance.The research and application of NB-Io T technology has been tentatively explored in this paper,which is believed to be of great reference significance in the development of environmental and energy monitoring technology.