1 / 20

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.

sondra
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related