基于NB-IoT和OTA的云上智能井盖监控系统设计

针对智慧城市建设中城市排水管网各类井盖出现的安全隐患问题及管理难等弊端，提出并实现了基于NB-IoT和OTA的云上智能井盖监控系统。硬件上选用国产低功耗蓝牙芯片HS6621进行电路设计，采集井盖的位置、姿态和井下水位、溢水等信息，通过NB-IoT模块上报云平台。软件上采用微服务技术架构，将井盖的实时监测及日常维护管理等任务分解到不同的服务中，并利用OTA空中下载技术完成终端固件远程升级。经测试，终端硬件整机功耗为98.25uA，符合低功耗设计要求，终端可正常上报监测数据并及时触发报警，能达到实时监控效果。通过管理软件进行工单派发、任务验收和固件升级等日常管理，可降低终端维护成本，有效提高城市智能化管理水平，改善落后的管理方式。

Cloud intelligent manhole cover monitoring system based on NB-IoT and OTA

Aiming at the disadvantages of potential safety hazards and difficult management of various manhole covers in urban drainage pipe networks in the construction of smart cities, a cloud-based intelligent manhole cover monitoring system based on NB-IoT is proposed and implemented. The hardware uses the domestic Bluetooth low energy chip HS6621 for circuit design, collects the position, attitude, downhole water level, overflow and other information of the manhole cover, and reports it to the cloud platform through the NB-IoT module. The software adopts microservice technology architecture to decompose tasks such as real-time monitoring and daily maintenance management of manhole covers into different services, and uses OTA over-the-air download technology to complete remote firmware upgrade of terminals. After testing, the power consumption of the terminal hardware is 98.25uA, which meets the design requirements of low power consumption. The terminal can normally report the monitoring data and trigger the alarm in time, which can achieve real-time monitoring effect.Daily management such as work order distribution, task acceptance and firmware upgrade through management software can reduce terminal maintenance costs, effectively improve the level of urban intelligent management, and improve outdated management methods.