Presentation for ENSC 440/305 Instructors: Patrick Leung, Steve Whitmore Department of Engineering Science Simon Fraser University

Presentation for ENSC 440/305

Instructors: Patrick Leung, Steve Whitmore

Department of Engineering Science

Simon Fraser University

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Outline

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Introduction System Features System Development Scheduling Cost Potential Market Problems Encountered Future Extensions

Copyright © 2008 Corazon Engineering Inc.

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Introduction

112/04/19 3Copyright © 2008 Corazon Engineering Inc.

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Motivation

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36% of all death in U.S. are caused by cardiovascular diseases in 2007

American Heart Association

Physicians cannot effectively predict heart attacStudy conducted by Dr. Lewis Kuller

“Heart rate itself does not completely reflect the state of the health of the heart, without knowing what the person is doing.”

Dr. William New, Stanford University


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Existing Heart Rate Monitoring System

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Most devices monitors heart rate only Do not know the activity associated with heart

rate Lack of mobility for medical equipments


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Our Solution

Heart rate with their associated activity Non-invasive and mobile Monitoring result is transferable to medical professionals Affordable


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Corazon Engineering Inc.

Why we name ourselves Corazon? -Corazon means “Heart” in Spanish.

Our Mission Statement - Applying the cutting-edge technology to develop innovative

products on preventing heart related disease.


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Company Profile

Benny Hung

[CEO]

Mike Mao

[CFO]

Thomas Cho

[CTO]

Philip Lin

[VP

of

Engineering]


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System Development


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System Overview

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Heart Rate Sensor

MotionSensor

MicrocontrollerUnit

Symbian Application

BluetoothModule

Nokia N 73Display

D

D C

D DD

C - Control

D - Data


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Heart Rate Sensor Module

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General ECG Properties Design Consideration Sensor Performance


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General ECG Properties

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ECG Signal Bandwidth: 0.5 Hz ~ 100 Hz

ECG Signal Amplitude : ~ 1mV


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Design Consideration

Proper filters to extract the heart beat information

Suitable amplifiers to provide signal for MCU to calculate heart rate


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Design Overview

Low Pass Filter

40 KHz

InstrumentationAmplifier

Low Pass Filter

100 Hz

Notch Filter60 Hz

ArtifactRemover

Output Amplifier

ECG SignalInput

PulseOutput


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Artifact Remover

With Artifact Remover

Without Artifact Remover

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Filter Performance

100Hz Low Pass Filter


60Hz Notch Filter

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FFT for Pulse Output


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How does it look

Before After


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Motion Sensor Module

MEMS based accelerometer

3-Axis output


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Functionality

G-forces table

Set threshold at boundary


G Force Analog Value

- 1 1.00 V

0 1.70 V

1 2.30 V

G Force Analog Value

0.5 2.00 V

-0.5 1.22 V

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How does it look


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Microcontroller

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I/O Connections Heart rate detection Position/Motion detection


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I/0 Connections

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ADC

Timer input capture

UART


Motion sensor Heart rate Bluetooth

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Heart Rate Calculation

PeriodTHeartRate

60


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Position/Motion Detection

1

1.2

1.4

1.6

1.8

2

2.2

2.4

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Stationary

Average

1

1.2

1.4

1.6

1.8

2

2.2

2.4

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Moving

Average

Average 1.78Variance 0.025

Average 1.76Variance 0.19


Stationary

Moving

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Implementation in MCU

Human motion limitation at 4 Hz Sampling at 10 Hz Average of data for static position Variance of data for motion level


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Firmware Flow Chart


Start

Initialization

Pulse Captured?

Timer Time Out?

Enable Interrupt

Error HandlingCalculate

Heart RateUpdate

Heart Rate

Add New SamplesTo Motion Buffer

Position/Motion

Detection

Buffer OV

TransmitData to BlueTooth

No

Yes

Yes Yes

No

No

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Symbian Application

Bluetooth client User interface for our system Logs data into text file


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Application State Diagram


Getting Service

Getting Connection

Getting Device

DisplayError

Connected Receive

Disconnect

Idle

Bluetooth Connect Initiated

HRMMS DeviceSelected

No Bluetooth Device Found

No Service Found/Firmware Error

Phone Found HRMMS Service

Cannot Establish Connection

Connection Establish

Check For Incoming Data

No Incoming Data

Disconnect Initiated Disconnect Initiated

Received Incoming DataNo Command

Return to Idle

Return to Idle

User Chose to Research Device

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Scheduling


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Initialize Schedule VS. Actual Progress


Initialize Schedule

Actual Progress

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Cost


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Cost Comparison

Miscellaneous Include: connector head, power switch, LED and Labeling

Components Budget Cost Implementation Cost

Accelerometer 10.00 20.00

ADC 20.00 -

Battery Power System 20.00 10.00

Bluetooth Module 50.00 97.00

Cables 20.00 5.00

Case 20.00 10.00

Electrode 20.00 8.85

Heart Rate Monitor Module 80.00 38.00

Microcontroller 100.00 60.00

PCB 10.00 -

Miscellaneous 50.00 50.00

PCB Fabrication from Hong Kong - 400.00

Total Cost 400.00 698.85


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Potential Market


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Personal Health Monitoring Elderly Home Monitoring Heart Rehabilitation Program Military and Rescue Personnel Use Athletic Performance Training

Potential Market


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Problems Encountered

36Copyright © 2008 Corazon Engineering Inc.

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Problems Encountered

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Signal artifacts caused by electrode contact Initial motion sensors broke during testing Homemade PCBs did not turn out well Microcontroller register not set properly Symbian application installation problems due to

IDE versioning


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Future Extensions

38Copyright © 2008 Corazon Engineering Inc.

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Future Extensions

39

Wireless Sensor Additional static positions detection Specific motion detection Port our phone application to other platform Variety of Bio-Sensors for other health monitoring


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Acknowledgements


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ProductDemonstration


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Question Period


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Our Feelings


Benny Hung – “A milestone for all knowledge I have learned in the past five years as a undergraduate student”

Mike Mao – “A great overall engineering experience, from initial design to the completion of prototype device”

Thomas Cho –“A great opportunity for me to learn more about Symbian programming”

Philip Lin – “Amazing team work experience and a good opportunity to apply all the hardware knowledge learned throughout my undergraduate studies”

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We are done !


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End


Documents

Presentation for ENSC 440/305 Instructors: Patrick Leung, Steve Whitmore Department of Engineering Science Simon Fraser University