| With the development of social economy and the improvement of living standards,people have higher and higher requirements for the safety of the living environment,and it is imperative to implement safety monitoring of the community environment.Traditional cell security and environmental monitoring systems mostly use 4G,3G,WLAN and other communication technologies,but they have the disadvantages of large power consumption,limited communication distance,and excessive use of cell base station resources.With the development of communication technology,NB-IoT(narrowband Internet of Things)technology can be widely used in community security monitoring due to its low power consumption,wide coverage,and large connection.Therefore,this paper designs a community security and environmental monitoring system based on NB-IoT technology,which is of great significance to improve the quality of life of the community and improve the happiness index of residents.This paper aims at the current security and environmental monitoring problems in urban communities,combined with the current development of security and environmental monitoring technology,after studying the system’s function and performance requirements analysis,overall structure design and server-side functional design,the embedded system is adopted Development technology,face recognition technology,NB-IoT communication technology and application development technology,etc.,designed and implemented a community security and environment monitoring system based on NB-IoT.The system uses a face recognition module based on the S3C6410 processor in the design,and only uploads the recognition results to prevent the leakage of the owner’s privacy;the STMM32F103 processor and various environmental information sensors are used for hardware design to prevent temperature,humidity,and harmful gas concentration,PM2.5 concentration and other real-time collection,and data transmission through the NB-IoT module;after data forwarding through the cloud platform,through the use of SpringBoot+Maven+Eclipse Mars2+MySQL architecture to design the server side to achieve data information The real-time reception,display and abnormal alarm functions of the mobile phone terminal;the mobile phone terminal is developed based on the Android system to realize the reception and display of data information on the server side.The system was tested under different time periods and different weather conditions.The test results show that the security and environmental monitoring system can run stably for a long time,and can realize the real-time collection and transmission of various environmental parameter data.By comparing the environmental information data collected by the system with the instrument measurement values,the temperature and humidity data errors are within 3%,and the smog concentration and PM2.5 concentration data errors are within 5%.The average response time is less than 2s through the time that the measurement system collects and transmits data. |
