Design And Implementation Of Intelligent Manhole Cover System Based On LoRa

At present,there are various security risks in the traditional manhole cover,and stolen incidents have occurred.In addition,the manpower management method is not only inefficient,but also causes great waste of resources.Based on the status and development requirements of manhole cover management in smart cities,this paper proposes an intelligent manhole cover monitoring system.The system is mainly composed of four parts: information management,alarm management,monitoring management and configuration management.The main tasks of this thesis are as follows:1)Specific hardware design for the intelligent manhole cover system.Select STM32L151CBT6 A as the core processor,HDS10 as the water level detection sensor,and ADXL362 as the acceleration sensor.This article uses LoRa technology to ensure low power consumption of the communication module.2)Specific software design for the intelligent manhole cover system.The specific business logic is realized through the SSH framework,and the core function of the intelligent manhole cover system is realized.The use of Openstack to manage cloud resources ensures the stability and timeliness of the system.3)Optimize the site’s deployment framework.The traditional collection site is deployed with the Star network architecture.Although this architecture is easy to manage,the cost of building such relay stations(such as gateways)will increase significantly as the scope expands.This thesis proposes a Tree-Star architecture with a gateway plus several terminal devices.By deploying one master and three slaves,the test is divided into two cases: single damage and two damages on the slave side.The test results show that there is no time conflict in the data transmission from the slave side of the Tree-Star architecture,and the data cannot be transmitted only when the slave side is damaged.When the slave end is damaged,the system will also store the damage message in the data and replace the damaged tree-like slave back through the replacement behavior of the tree-like slave designed in this paper to ensure connectivity.In terms of cost,no matter how large the Tree-Star architecture is,there is only one main end of the system.With the expansion of the system architecture,it is only necessary to increase the number of tree-shaped and star-shaped slave ends.Compared with the Star network architecture,this architecture has obvious economics.