Intelligent Street Lamp Management System Based On NB-IoT

With the implementation of the national big data strategy and the continuous development of “Digital China”,the construction of smart cities has been given new connotations and requirements.As an important part of smart cities,intelligent street lamp management systems are welcoming unprecedented development opportunities.Aim at the lag of traditional street lamp management,lack of real-time monitoring and remote control,and the inability to achieve intelligent dimming,this thesis designs a set of intelligent street lamp management system based on NB-IoT(Narrow Band-Internet of Things).The system is mainly composed of a street lamp terminal,a base station and a core network,an IoT cloud platform and a mobile APP client.The street light terminal includes a single light controller,an LED light fixture and a power adapter.In the hardware design part of the streetlight terminal,the STM32L4 equipped with Lite OS IoT lightweight operating system is the main control chip,combined with NB-IoT communication module,illumination intensity sensor,infrared sensor,GPS positioning module,current voltage acquisition module and DC power supply module.A single light controller was designed.In the software part of the streetlight terminal system,this thesis applies SVR(Support Vector Regression,support vector machine regression fitting)to simulate the dimming level,and collects 60 groups of original data including time,ambient light intensity and traffic flow for normalization processing.This thesis randomly selects 40 groups of data to train the training samples according to the feature vector,and 20 groups of data as the prediction samples.According to the simulation prediction results,the system has designed several dimming strategies and power-saving and power-off strategies for different situations,finally realized the intelligentization and automatic dimming of street lamps.The monitoring center of the system consists of the Internet of Things cloud platform and the mobile APP client.The data collected by the sensor is transmitted to the NB-IoT module through the UART serial port.The module packs the data in the form of CoAP protocol,and sends it to the IoT cloud platform through the base station and the core network to realize real-time monitoring on the cloud platform.Through the Restful API interface provided by the IoT cloud platform,the mobile APP client can implement data docking with the IoT cloud platform.At the same time,through the APP program design,remote switch,networking control,street lamp positioning and parameter anomaly detection can be realized.The system has functions such as automatic dimming,remote control,parameter monitoring and fault monitoring according to the environment.It uses NB-IoT new IoT communication technology to realize remote control.The monitoring center manages street lights in one area unifiedly.According to different rules,the street lamp terminal is flexibly controlled to save power consumption of the street lamp,save manpower and material cost,and reduce maintenance cost.