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Senior Design I - ECE 4512 Mississippi State University Department of Electrical Engineering

Heart Monitor. Senior Design I - ECE 4512 Mississippi State University Department of Electrical Engineering. Advisor: Dr. Lori Bruce bruce@ece.msstate.edu. Team Leader: Todd Peacock tpp1@ece.msstate.edu. K’lvin Sui kvs1@ece.msstate.edu. Craig Williamson lcw1@ece.msstate.edu.

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Senior Design I - ECE 4512 Mississippi State University Department of Electrical Engineering

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  1. Heart Monitor Senior Design I - ECE 4512 Mississippi State University Department of Electrical Engineering

  2. Advisor: Dr. Lori Bruce bruce@ece.msstate.edu Team Leader: Todd Peacock tpp1@ece.msstate.edu K’lvin Sui kvs1@ece.msstate.edu Craig Williamson lcw1@ece.msstate.edu Chong Meng Teh ct3@ece.msstate.edu Team Members

  3. Individual Contributions • Todd Peacock • Micro-controller frequency detection • Craig Williamson • Amplifier and filter • Voon Siong K’lvin Sui • Micro-controller LCD programming • Chong Meng Teh • Optical Signal generation and detection

  4. Abstract • A heart rate monitor that is accurate, affordable, and easy to use is essential to ensure one’s health quality • Today, the heart rate monitors in the market are either too expensive, inaccurate or not user friendly

  5. How to measure your heart rate? • Stethoscope • Inaccurate 2. Electrocardiogram • Very expensive • Not user friendly

  6. 3. Optical method • Portable • Inexpensive • Accurate • Safe

  7. Flow Chart of Design Optical Signal Transmitter Optical Signal Receiver Low Pass Filter & Amplifier A/D Micro- Controller Display 82

  8. Design Approach • Optical Transmitter and Receiver • PSPICE will be used to simulate the output voltage of the the pulse receiving part of the design • Signal Analysis • Matlab will be used to conduct filter tests • PSPICE will be used to simulate the amplifier, filter, and comparator

  9. Design Requirements 1. Pulse acquisition: • Light Transmitter: The transmitter will be a red LED light source to reflect the pulse signal from changes in reflectivity caused by changes in blood flow in the index finger. • Pulse Receiver: The receiver will be a photo-sensor that will detect the pulse signal, by sensing attenuations from the transmitted light through an index finger, and create an output voltage in the range of –5 to +5 mV.

  10. Design Requirements • 2. Signal Extraction:A low pass filter and amplifier will be designed to remove noise from ambient light and level detection distortions. • Cutoff frequency of 4 Hz (200 BPM max heart rate) • Roll off rate of 20 dB/dec (lower order filter) • Attenuation of 60 Hz noise by 23.5 dB • Amplification of pass-band frequencies by 40 dB • DC blocking will be used to prevent level offsets

  11. Design Requirements • 3. Pulse Digitization:The conditioned signal will be analyzed by a comparator to produce a digital pulse. • 1 Vpp output digital pulse • Time between rising pulse edges corresponds to heart rate period • 4. Display:The heart rate will be displayed on a 3-digit LCD display. • Pulse rates measured between 0 < pulse rate < 200

  12. Design Requirements • 5. Accuracy:Due to noise, there will be distortion. Currently available optical heart monitors have a range of +/- 10-15% error. • The design will measure heart rate with no more than +/- 10% error. • Dynamic pulse averaging is used to give a better distribution of accuracy over the full range of pulses. • 6. Power: • The battery will last 1 year with typical usage. • A watch battery will be used to compact the design. • A 3 volt lithium battery will be used.

  13. Design Requirements • 7. Durability: • Operating temperature of –30 C to 80 C • Shock resistant • Water resistant • 8. Physical Packaging: • Design will be close to the size of a standard stopwatch. • Final packaged dimensions will not exceed 2.5” x 1.7” x 1” (H x W x D). ( rectangular shaped plastic enclosure)

  14. Design Requirements 9. Cost:The component cost should not exceed $30.00. The production cost should not exceed $90.00.

  15. Test Specifications Circuit Simulation - Used to test components design Software - Software will be used to test and program components

  16. Signal & Noise

  17. Filter Design

  18. Comparator Design

  19. Microcontroller & Display

  20. Acknowledgements • We would like to thank Dr. Lori Bruce, our advisor, for her advice and assistance on our project

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