March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Team Pacemaker Apparatus for the Analysis of Heart Sounds Electronic Stethoscope / EKG Device Luke Philips Ryan Laterza Min Dong Bian Sarah Makhija

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds 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

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Design Summary Current Domain Model

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Design Summary (cont.) Future Domain Model

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Project Diagram

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Preliminary Graphical Displays Dr. Weinberger’s data files No accompanied EKG data

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds EKG Triggering & Averaging 10 sec. FFT of Filtered Stethoscope Data

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Mixed Signal Microcontroller TI MSP430F1611

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds 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

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds 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

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Example C Code “Blinking Lights” #include "hardware.h" void delay(unsigned int d) { int i; for (i = 0; i<d; i++) { 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 >(o&7)); delay(0x4fff); }

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds EKG Amplifier Circuit Design

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Amplifier Implementation 1. 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

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Advantages

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds 2. Single-Supply CMOS Operational Amplifiers OR…

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Features

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Applications

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Simple Circuit Testing for Optimal Design OPA 335LF356 3.Bypass Capacitors 0.1 nF & 4.7 nF

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Before & After Adding Amplifier

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds EKG Schematic

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Power & User Interface

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Power Power Supply – “wall wart” interface Supplies up to 9VDC/300mA –Regulated 5V/3.3V –Stand alone Battery Charger AC A-01 single cell charger –Numerous Adjustable Voltage Regulators

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Power Battery –ED C 860mAh Polymer Lithium Ion Battery High Energy Density Low Cost 3.7V Nominal Working Voltage Low Weight oz (18.5g) Excellent Temperature Performance Self-Discharge: <8% (per month)

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Power Intelligence –TI-TPS65011 Multi-Channel 1-cell Li-Ion Power Mgmt IC 2DC/DC, 2 LDOs, I2C interface

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds UI LCD, two stages: –Hantronix HDM08216L 8x2 –Seiko Backlight Graphic LCD

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds UI Keypad 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

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds 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

March 2, 2006CDR – Apparatus for the Analysis of Heart Sounds Thank You! Questions/Comments?