Walking Stick with Heart Attack Detection

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Walking Stick with Heart Attack Detection

By

Helen Kim
Choon Yik Lee

ECE 445, SENIOR DESIGN PROJECT

SPRING 2005

TA: Richard Cantzler

May 3, 2005

Project #28

ABSTRACT

The Walking Stick with Heart Attack Detection is equipment that is used daily to indicate heart condition, to detect heart attack and to call for emergency help. It was designed specially to help senior citizens and patients with heart disease. This project is based on the previous project “Wireless Heart Attack Detector with GPS” of Fall 2004 [1].

TABLE OF CONTENTS

1. INTRODUCTION………………………………………………………......................................1 1. Overview of Design………………………………………………………………………….2 2. Specification…………………………………………………………………………… .…3 3. Performance Benchmarks……………………………………………………………………4 4. Subprojects…………………………………………………………………………………...4

2. DESIGN PROCEDURE…………………………………………………………………………5 1. Biosensors……………………………………………………………………………………5 2. Analog ECG Circuitry……………………………………………………………………….5 3. Data Transmission between Wrist and the Walking Stick…………………………………..9 2.4 A/D conversion of Analog ECG signal to Digital ECG signal………………………………10 2.5 Heart Attack Detection…………………………………………………………………….....11 2.6 Emergency Calling…………………………………………………………………………...11

3. DESIGN DETAILS………………………………………………………………………….……12 1. Analog ECG Circuitry……………………………………………………………………….12 3.2 A/D Conversion and RS232 of PIC16F877…………………………………………………..12 3.3 Digital Data Transmission of HP-3 Transceiver……………………………………………...13 3.4 Heart Attack Algorithm of the Javelin Stamp Microcontroller………………………….……14 3.5 Low-Risk and High-Risk LEDs of Heart Attack……………………………………………..14 3.6 EB500 Bluetooth Module and Javelin Stamp Microcontroller…………………………….....15

4. DESIGN VERIFICATION/TESTING…………………………………………………………....16 4.1 A/D Conversion……………………………………………………………………………....16 2. RS232 of the PIC……………………………………………………………………………..16 4.3 ECG Data Collection and Wireless Transmission between Wrists and the Stick…………….16 4.4 Heart Attack Algorithm……………………………………………………………………….17 4.5 Alert Level…………………………………………………………………………………….17 4.6 Emergency Calling…………………………………………………………………………....17 4.7 Power Consumption…………………………………………………………………………...17 4.8 Weight………………………………………………………………………………................17

5. COST………………………………………………………………………………………………18 1. Parts and Cost………………………………………………………………………................18 6. IMPROVEMENTS TO THE PREVIOUS PROJECT…………………………………...............20 7. CONCLUSIONS………………………………………………………………………………….22 APPENDIX 1 - ECG Analog Circuit, PIC16F877, HP-3 Transmitter……………………………23

APPENDIX 2 - HP-3 Receiver, Javelin Microcontroller, EB500 Bluetooth Module…………….24 APPENDIX 3 –Sample Normal ECG Waveforms………………………………………………..25
APPENDIX 4- Sample Abnormal ECG Waveforms……………………………………………...26 APPENDIX 5- PIC16F877 Programming Code…………………………………………………..27 APPENDIX 6 – Javelin Stamp Programming Code……………………………………………….28

REFERENCES…………………………………………………………………………………….37
ACCKNOWLEDGEMENT……………………………………………………………………….38 1. INTRODUCTION

The National Heart, Lung, and Blood Institute [2] states that “more than a million persons in the U.S. have a heart attack and about half (515,000) of them die in each year. About one-half of those who die do so within 1 hour of the start of symptoms and before reaching the hospital”. A heart attack happens to a person when the blood flow and oxygen supply to heart muscle is blocked, and it is mostly caused by the Coronary Artery Disease (CAD) [2]. CAD occurs when the arteries that supply blood to the heart muscle (coronary arteries) become hardened and narrowed [3]. It often causes irregular heart beat or rhythm by blocking blood stream [2]. The National Heart, Lung, and Blood Institute [2] suggest that “everyone should know the warning signs of a...
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