基于NB-IoT网络的超声水表设计

Design of Ultrasonic Water Meter Based on NB-IoT Network

目前,机械表占据了水表的主要市场,但机械表存在着一定的弊端,如成本高、通信质量差、寿命较短、小流检测不准确、测量精度易受水质和部件的影响、施工程序复杂以及缺乏实时监测功能。针对上述问题,设计了一种基于NB-IoT网络的超声水表,通信部分采用NB-IoT通信技术,微控制器采用低功耗设计的STM32L系列单片机,超声波流量测量部分采用时差法。主要研究了超声水表声道布置及工作原理和换能器的选型,介绍了基于NB-IoT网络的超声水表的硬件设计和软件设计。进行了流量性能误差测试,并测试了水深、表深、覆盖物材质对该水表NB-IoT通信的平均数据上传率的影响。实验结果表明,设计的基于NB-IoT网络的超声水表运行稳定,各项性能均满足预期要求。

At present, mechanical watches occupy the main market of water meters, but mechanical watches have certain drawbacks, such as high cost, poor communication quality, short life span, inaccurate detection of small streams, measurement accuracy easily affected by water quality and components, construction procedures complexity and lack of real-time monitoring capabilities. In response to the above problems, an ultrasonic water meter based on NB-IoT network is designed. The communication part adopts NB-IoT communication technology, the microcontroller adopts the STM32 L series single-chip microcomputer with low power consumption design, and the ultrasonic flow measurement part adopts the time difference method. This article mainly studies the channel arrangement and working principle of ultrasonic water meter and the selection of transducer, and introduces the hardware design and software design of ultrasonic water meter based on NB-IoT network. The flow performance error test was performed on this design, and the influence of water depth, surface depth, and covering material on the average data upload rate of the water meter NB-IoT communication was tested. The experimental results show that the ultrasonic water meter based on the NB-IoT network designed in this paper operates stably, and all performances meet the expected requirements.