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Team Pacemaker Luke Philips Ryan Laterza Min Dong Bian Sarah Makhija Apparatus for the Analysis of Heart Sounds Electronic Stethoscope / EKG Device Project Objectives Provide objective means of analyzing cardiac acoustics Aid in diagnosis of heart murmurs

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team pacemaker

Team Pacemaker

Luke Philips

Ryan Laterza

Min Dong Bian

Sarah Makhija

Apparatus for the Analysis of Heart Sounds

Electronic Stethoscope / EKG Device

CDR – Apparatus for the Analysis of Heart Sounds

project objectives
Project Objectives
  • Provide objective means of analyzing cardiac acoustics
    • Aid in diagnosis of heart murmurs
  • Amplified signal from stethoscope, EKG
    • Synchronized signals
  • Handheld device, portable memory, graphical display

CDR – Apparatus for the Analysis of Heart Sounds

design summary
Design Summary

Current Domain Model

CDR – Apparatus for the Analysis of Heart Sounds

design summary cont
Design Summary (cont.)

Future Domain Model

CDR – Apparatus for the Analysis of Heart Sounds

project diagram
Project Diagram

CDR – Apparatus for the Analysis of Heart Sounds

preliminary graphical displays
Preliminary Graphical Displays
  • Dr. Weinberger’s data files
  • No accompanied EKG data

CDR – Apparatus for the Analysis of Heart Sounds

slide7

EKG Triggering & Averaging

10 sec. FFT of Filtered Stethoscope Data

CDR – Apparatus for the Analysis of Heart Sounds

slide8

Mixed Signal MicrocontrollerTI MSP430F1611

CDR – Apparatus for the Analysis of Heart Sounds

msp430f1611 features
MSP430F1611 Features
  • Program Memory Type Flash  
  • Program Memory 48 kB
  • RAM 10 kB
  • I/O Pins 48  
  • ADC 12-bit SAR 
    • 8 Software Programmable Input Channels
    • 200 ksps Maximum Conversion Rate
  • Integrated Peripherals DMA, 2 12-bit DAC
  • Interface 2 Hardware SPI or UART
  • Pin/Package 64LQFP

CDR – Apparatus for the Analysis of Heart Sounds

programming the microcontroller
Programming the Microcontroller
  • MSPGCC
    • Free C Compiler TI MSP430 Family
    • Windows and Unix Compatible
    • Supports the MSP430F1611 MCU
    • Supports JTAG Interfacing
      • Interface Used to Download Code from the PC to the MCU via a Serial/Parallel/USB Adapter

CDR – Apparatus for the Analysis of Heart Sounds

example c code blinking lights
Example C Code“Blinking Lights”

#include "hardware.h"

void delay(unsigned int d) {

int i;

for (i = 0; i<d; i++) {

nop();

nop();

}

}

int main(void) {

int i;

int o = 0;

WDTCTL = WDTCTL_INIT;

P1OUT = P1OUT_INIT;

P2OUT = P2OUT_INIT;

P1SEL = P1SEL_INIT;

P2SEL = P2SEL_INIT;

P1DIR = P1DIR_INIT;

P2DIR = P2DIR_INIT;

P1IES = P1IES_INIT;

P2IES = P2IES_INIT;

P1IE = P1IE_INIT;

P2IE = P2IE_INIT;

while (1) { //main loop, never ends..

for (i=0; i<8; i++, o++) {

P1OUT = (1<<i) | (0x80>>(o&7));

delay(0x4fff);

}

}

}

CDR – Apparatus for the Analysis of Heart Sounds

slide12
EKG

Amplifier Circuit Design

CDR – Apparatus for the Analysis of Heart Sounds

amplifier implementation
Amplifier Implementation
  • LF155/LF156…./LF356 JFET input Operational Amplifiers
  • Applications:
  • Precision High Speed Integrators
  • Fast D/A & A/D Converters
  • High Impedance Buffers
  • Wideband, low noise, low drift amplifiers

CDR – Apparatus for the Analysis of Heart Sounds

slide14
Advantages

CDR – Apparatus for the Analysis of Heart Sounds

slide15

OR…

2. Single-Supply CMOS Operational Amplifiers

CDR – Apparatus for the Analysis of Heart Sounds

features
Features

CDR – Apparatus for the Analysis of Heart Sounds

applications
Applications

CDR – Apparatus for the Analysis of Heart Sounds

simple circuit testing for optimal design
Simple Circuit Testing for Optimal Design

OPA 335

LF356

  • Bypass Capacitors
  • 0.1 nF & 4.7 nF

CDR – Apparatus for the Analysis of Heart Sounds

before after adding amplifier
Before & After Adding Amplifier

CDR – Apparatus for the Analysis of Heart Sounds

ekg schematic
EKG Schematic

CDR – Apparatus for the Analysis of Heart Sounds

power user interface
Power & User Interface

CDR – Apparatus for the Analysis of Heart Sounds

power
Power
  • Power Supply
    • “wall wart” interface
      • Supplies up to 9VDC/300mA
    • Regulated 5V/3.3V
    • Stand alone Battery Charger
      • AC12050615A-01 single cell charger
    • Numerous Adjustable Voltage Regulators

CDR – Apparatus for the Analysis of Heart Sounds

power23
Power
  • Battery
    • ED053455-2C
      • 860mAh Polymer Lithium Ion Battery
      • High Energy Density
      • Low Cost
      • 3.7V Nominal Working Voltage
      • Low Weight - 0.65oz (18.5g)
      • Excellent Temperature Performance
      • Self-Discharge: <8% (per month)

CDR – Apparatus for the Analysis of Heart Sounds

power24
Power
  • Intelligence
    • TI-TPS65011
      • Multi-Channel 1-cell Li-Ion Power Mgmt IC
      • 2DC/DC, 2 LDOs, I2C interface

CDR – Apparatus for the Analysis of Heart Sounds

slide25
UI

LCD, two stages:

  • Hantronix HDM08216L
    • 8x2
  • Seiko Backlight Graphic LCD

CDR – Apparatus for the Analysis of Heart Sounds

slide26
UI
  • Low power Keypad Interface With the MSP430
  • interrupt driven
  • Low power if all keys are pressed and held simultaneously
  • No crystal required
  • Minimal external components
  • Suitable for MSP430
  • Keypad

CDR – Apparatus for the Analysis of Heart Sounds

updated schedule division of labor
Updated Schedule & Division of Labor

Milestone 1 – Data sampling; Power device; EKG Circuit

Milestone 2 – UI / Software Integration

Expo – Device able to acquire and display data

CDR – Apparatus for the Analysis of Heart Sounds

thank you
Thank You!

Questions/Comments?

CDR – Apparatus for the Analysis of Heart Sounds