一种基于单片机的心电监测系统实验案例设计

Experimental Case Design of ECG Monitoring System Based on Microcontroller

目的设计一个能测量受试者心电图(Electrocardiogram,ECG)信号并在Android手机上实时显示的监测系统,为《单片机原理与接口技术》课程教学提供一个实验案例设计,促进实验教学水平与教学质量。方法利用全集成式ECG信号调理模块,实现对心电信号的提取、放大、滤波及右腿驱动输出至单片机主控模块。利用单片机的ADC、定时器及全双工异步串行通信的功能,将信号调理模块采集的心电信号转换为数字信号,通过CH340 USB转串口模块传输至Android程序,将信号实时显示。结果该系统可实现心电信号的监测并可通过手机实时显示ECG及心率,显示效果良好,测试分析的准确度为99.89%。同时,利用该项目实验教学可设计基本、进阶及拓展三个层次的内容与任务来满足不同学习能力的学习需求。结论本实验案例实现了心电信号的监测并可通过手机实时显示ECG及心率,满足应用的测量准确度。同时,将该项目应用于《单片机原理与接口技术》课程实验教学,具有较好的推广价值。

Objective To design a monitoring system that can measure electrocardiogram(ECG)signals and display them on cell phone with android system in real time,which provide an experimental case for“Microcontroller Principles and Interface Technology”course and to promote the level of experimental teaching and teaching quality.Methods Using fully integrated ECG signal conditioning module,the ECG signal was extracted,amplified,filtered and driven from the right leg to the main control module of a microcontroller.The ECG signal was converted into a digital signal by using the ADC,timer and full-duplex asynchronous serial communication functions of the microcontroller,and then transmitted to the Android program through the CH340 USB to serial module for real-time display of the signal.Results The system could monitor ECG signals and displayed ECG and heart rate in real time via cell phone with good display effect and 99.89%accuracy of test analysis.At the same time,the experimental teaching of the project could be designed with three levels of content and tasks:basic,advanced and extended to meet the needs of different learning abilities.Conclusion This experimental case realized the monitoring of ECG signal and can display ECG and heart rate in real time by cell phone,which meets the measurement accuracy of the application.At the same time,applying this program to the teaching of“Microcontroller Principle and Interface Technology”course has good promotion value.