This application report describes the implementation of a flow meter using the Texas Instruments MSP430FR6989 microcontroller with the Extended Scan Interface (ESI) module. This module can provide a contactless sensing approach to detecting a rotating disc. The number of rotations of the disc indicates the volume flow of gas or water and can be used to calculate the fee for the user. This application is good for gas or water meters. This application also includes the necessary information with regard to software and hardware procedures for the Water Meter Reference Design for two LC Sensors, Using Extended Scan Interface (ESI) (TIDM-LC-WATERMTR).
The software described in this app note can be downloaded from http://www.ti.com/lit/zip/tidc583.