基于NB-IoT网络的无磁智能水表设计

Design of non-magnetic smart water meter based on NB-IoT network

传统水表以机械表为主,存在不能实时监测、施工程序复杂、成本高以及通信不稳定等问题。针对上述问题,设计了一种基于NB-IoT网络的无磁智能水表,通讯部分采用NB-IoT窄带物联网技术,弥补了传统水表存在的缺陷,具有功耗低、成本低、安全级别高、可靠性好和信号覆盖范围广等优点;主控制芯片采用低功耗设计的STM32L系列单片机,可实现电池电压预警、周期数据上报、远程下发指令等功能;机电转换部分采用无磁传感技术,其抗磁信号干扰能力强,稳定性高,可避免因流体通过时产生较大的压力损失而导致计量偏差。对NB-IoT网络的无磁智能水表的数据传输部分和机电转换部分进行了重点介绍,对机电转换方式进行了研究,并测试了水深、表深、覆盖物材质对该水表NB-IoT通讯的平均数据上传率的影响。

Traditional water meters are mainly mechanical meters,which can not be monitored in real time,complicated construction procedures,high cost and unstable communication.In order to solve the above problems,a non-magnetic intelligent water meter based on NB-IoT network is designed.The communication part adopts NB-IoT narrow-band Internet of things technology,which makes up for the defects of traditional water meters.It has the advantages of low power consumption,low cost,high security level,good reliability and wide signal coverage.The main control chip adopts stm32 L series single-chip microcomputer with low-power design,which can realize battery voltage pre-set.It has the functions of alarm,periodic data reporting,remote command sending,etc.;the electromechanical conversion part adopts non-magnetic sensing technology,which has strong anti-magnetic signal interference ability and high stability,and can avoid measurement deviation caused by large pressure loss when the fluid passes through.The data transmission part and electromechanical conversion part of non-magnetic intelligent water meter based on NB-IoT network are mainly introduced.The electromechanical conversion mode is studied.The influence of water depth,surface depth and covering material on the average data upload rate of NB-IoT water meter is tested.