Design And Implementation Of Geomagnetic Parking Space Detection System Based On NB-IoT Technology

At present,with the continuous advancement of modern social and economic development,the national quality of life has been greatly improved,and the level of urbanization is also continuously improved.However,the limited number of parking spaces in urban life,coupled with the improper management of some parking lots The problem of low utilization rate of free parking spaces has caused the social difficulty of parking when citizens travel.Time and cost are two important factors in human life.Regardless of whether it is personal or business,parking difficulties will cause a lot of time consumption,and the quality of life will be greatly reduced.To ease the difficulty of parking and meet the needs of today's society For the development needs of intelligent transportation,an intelligent parking space detection system should be established in time to effectively detect the parking space usage status,and the parking space status can be monitored in real time,so that citizens can find free parking spaces in the parking lot in time,which greatly reduces the waste of time caused by blindly searching for parking spaces when traveling.Promote intelligent transportation.In response to the social problem of parking difficulty,this paper adopts an efficient parking space detection method,and combines with the current vigorously developed Internet of Things technology to design a geomagnetic parking space detection system based on NB-IoT technology.In this system,the STM32L151C8T6 ultra-low power single-chip microcomputer is used as the control core,and the HMC5883 L anisotropic magnetoresistive sensor is used as the parking space detection sensor.After the geomagnetic sensor collects the geomagnetic intensity of the parking space,the median filtering preprocessing and finite state machine algorithm are adopted by the MCU After processing,the current status of the parking space is obtained,and the NB-IoT technology is combined to realize the hardware device access to the Alibaba Cloud Internet of Things platform.The second vehicle detection test shows that the system uses geomagnetic sensors as the parking space detection method,which has strong anti-interference ability,low cost,and easy installation.It combines the median filter and thefinite state machine algorithm for high detection rate.The NB-IoT wireless transmission module is used The PSM power-saving mode has low power consumption,which can meet the long-term outdoor use of the system.The user uses the Web visualization as a host computer monitoring interface to have a good experience and is convenient for users to use.In summary,the NB-IoT-based geomagnetic parking space detection system studied by this system can solve the problem of intelligent parking lot occupancy detection and is a core component of the intelligent parking lot.The prospect is good,and it can be further promoted to realize its application value.The main content of this article can be summarized in the following aspects:(1)Investigate the current parking space detection technology used in the market,compare their respective advantages and disadvantages,and finally determine to use AMR sensors as the parking space detection method in this article.At the same time,the Internet of Things technology is introduced in detail,and the low-power NB is selected by comparison-IoT wireless transmission equipment as the wireless communication method in this article.(2)Complete the overall structure design,hardware circuit design of the geomagnetic parking space detection system based on NB-IoT technology,mainly including the system overall design structure description,system terminal detection node MCU minimum system design,NB-IoT wireless transmission peripheral circuit design.(3)After collecting the geomagnetic parking space data,the data is algorithmically processed,and the median filter algorithm is used to reduce the noise of the geomagnetic data.Then,the finite state machine is used to divide the current status of the parking space in detail,which improves the parking space detection.Effective recognition rate.(4)Complete system software design,embedded software design of lower computer,geomagnetic sensor to obtain electromagnetic data of parking space,NB-IoT device connected to Alibaba Cloud Internet of Things platform,upper computer uses Web to visually display the current parking space status.