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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 Project Objectives Provide objective means of analyzing cardiac acoustics Aid in diagnosis of heart murmurs

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Team Pacemaker

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  1. 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

  2. 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

  3. Design Summary Current Domain Model CDR – Apparatus for the Analysis of Heart Sounds

  4. Design Summary (cont.) Future Domain Model CDR – Apparatus for the Analysis of Heart Sounds

  5. Project Diagram CDR – Apparatus for the Analysis of Heart Sounds

  6. Preliminary Graphical Displays • Dr. Weinberger’s data files • No accompanied EKG data CDR – Apparatus for the Analysis of Heart Sounds

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

  8. Mixed Signal MicrocontrollerTI MSP430F1611 CDR – Apparatus for the Analysis of Heart Sounds

  9. 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

  10. 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

  11. 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

  12. EKG Amplifier Circuit Design CDR – Apparatus for the Analysis of Heart Sounds

  13. 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

  14. Advantages CDR – Apparatus for the Analysis of Heart Sounds

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

  16. Features CDR – Apparatus for the Analysis of Heart Sounds

  17. Applications CDR – Apparatus for the Analysis of Heart Sounds

  18. 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

  19. Before & After Adding Amplifier CDR – Apparatus for the Analysis of Heart Sounds

  20. EKG Schematic CDR – Apparatus for the Analysis of Heart Sounds

  21. Power & User Interface CDR – Apparatus for the Analysis of Heart Sounds

  22. 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

  23. 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

  24. 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

  25. UI LCD, two stages: • Hantronix HDM08216L • 8x2 • Seiko Backlight Graphic LCD CDR – Apparatus for the Analysis of Heart Sounds

  26. 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

  27. 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

  28. Thank You! Questions/Comments? CDR – Apparatus for the Analysis of Heart Sounds

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