基于MSP430FR6047的一款超声波水表

An Ultrasonic Watermeter Based on MSP430FR6047

摘要: 本文采用TI专用液体测量芯片MSP430FR6047为核心，设计了基于ToF (Time of Flight)测量原理的一款超声波水表，完成了液体测量系统中水表部分的硬件和软件的设计，制作了实物，并完成了测试。在水流工况下，通过检测超声波声束在水中上下行时速度变化引起的ToF差值，对其进行分析处理，得到水流速度，进而计算水流量，这些信息被存储在内部FRAM中并显示在定制液晶屏上。它具有优异的小流量检测能力，解决了许多传统机械水表存在的问题，适用于水资源的节约和合理利用。与机械式水表相比，有精度更高，可靠性更好，使用寿命更长，无任何活动部件等特点。

Abstract: This paper uses TI special liquid measurement chip MSP430FR6047 as the core, designs an ultrasonic water meter based on the principle of time difference method (ToF) measurement, completes the design of the hardware and software of the water meter part of the liquid measurement system, makes the real object, and completes the test. In water flow condition, ToF difference caused by velocity change of ultrasonic beam moving up and down in water is analyzed and processed to obtain water flow ve-locity and then calculate water flow. This information is stored in internal FRAM and displayed on a customized LCD screen. It has excellent small-flow detection ability, solves many problems existing in traditional mechanical water meters, and is suitable for saving and rational utilization of water resources. Compared with mechanical water meter, it has the characteristics of higher accuracy, better reliability, longer service life and no moving parts and so on.