Bioinstrumentation GroupPortable, Accurate ECG Machine

ECE 4007, L02Edward Kigwana, Team Leader

Romaric Lolo

Jinwook Flakes

Albert Emery

Introduction

• Portable ECG machines are useful for quick, easy monitoring of heart rhythms

• However, most systems on the market are very expensive, very bulky, or have an inadequate sampling rate for accurate diagnosis

• We plan to build a device which is not only accurate, but small and affordable

• Prospective Buyers: Hospitals, doctor’s offices, the military

Project Goals

• Easy, 5 button operation• Show accurate, noise-free ECG signal on

a monitor attached to the device• Ability to view data on a PC for further

storage and analysis• Battery operated, with at least four hours

of life• Weighs less than two pounds• Costs under $800

Technical Specifications

System Architecture

Design (analog)

• Electrodes/leads

• Pre-amplifiers

• Filters (high pass, low pass, notch)

• Differential amplifier

• Circuit for ESD protection

Design (digital)

• PIC32 80 MHz Microchip microcontroller - capable of processing 32-bit data

- built in USB, I2C, SPI interfaces

• 2 daisy-chained A/D converters

• LCD display

Project Demonstration• 12 electrodes will be placed on the subject’s chest, arms,

and legs• The operator will activate the ECG device by pressing

“on” and initiate data capture by pressing “start”• An ECG signal will be displayed on the LCD:

• The operator will demonstrate how to import the data to a PC for long-term storage

• The operator will deactivate the ECG device by pressing “stop”

Marketing Analysis

Device Price Sample RateOmron HCG-801 $335 125 S/s

Cardioline ar-600 $1,400 500 S/s

Philips Trim III $5,000 2 kS/s

GE MAC 5500 $10,000 4 kS/s

Bioinstrumentation Group <$800 52 kS/s

Bottom Line: We offer higher quality at a lower price.

Potential Difficulties

• LCD configuration

• Programming of all types

• A/D interface

• NOISE!!!

Questions?