Senior Design ECE 4512 Mississippi State University Department of Electrical Engineering

1. Heart Monitor Senior Design 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 the health quality of the people • 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. Why use optical technology? • Optical components are readily available at low cost • Low power consumption • Components are small which will result in a compact design (4” X 3” X 2”) • No straps like other heart monitor devices • Accurate • Non-invasive

8. Motivation • To design an accurate heart monitor at an affordable cost. • The heart monitor is compact (4” X 3” X 2”) and portable. • Is able to measure pulse rate from index finger, thus making it easy to use. • A safe heart monitor that does not invade the human body

9. Approach • Optical Transmitter and Receiver • - PSPICE • - Calculations • Signal Analysis • - Matlab • - Calculations

10. Objectives 1. Pulse detection: • Optical Signal Transmitter: The transmitter utilizes a red LED light source to reflect the pulse signal • Optical Signal Receiver: The receiver utilizes a photo- sensor to detect the pulse signal by sensing attenuations from the transmitting signal through an index finger 2. Signal Extractor:A low pass filter will be designed to remove noise from ambient light and level detection distortions

11. Objectives 3. Accuracy:Due to noise, there will be distortion. The design should measure heart rate with no more than a 10% error. 4. Power Consumption:The device will use a 9 volt battery source. 5. Cost:The production cost should not exceed $30 .00. The expected market price should not exceed $60.00.

12. Design Optical Signal Transmitter Optical Signal Receiver Low Pass Filter & Amplifier A/D Micro- Controller Display 69

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

14. Test Specifications

15. Future Aspects • Design can be upgraded by adding features for medical use. • Wireless monitoring - remote monitoring of infants for SIDS. - collection of database of patient’s history. - hospital emergency alert for patients with known heart conditions.

16. Summary We plan to design a heart monitor using optical technology • Affordable price • Allow quick and easy monitoring of the heart rate • Accurate • Safe and non-invasive

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

18. References [1] Z. Kmietowicz, “Better coronary care reduces deaths from heart disease,” British Medical Journal, p600, Tavistock Square, London March 2000. [2] J. Weller, “You’ve got the beat,” Women’s Sport and Fitness, p68, USA, September 1997. [3] R. Bandler, “Cardiac problem at heart of SIDS?”, BBI Newsletter, American Health Consultant, Inc., USA, April 1998. [4] J. Hastings, “You Call This Exercise?”, Health, Vol. 14, p106, USA, June 2000. [5] M. Bane, “Watch the Monitor,” Men’s Health, Vol. 11, p144, USA, November 1996.

19. [6] P. Kandela, “The stethoscope,” The Lancet Interactive, UK, p23, September 1998. [7] J. Carroll, “SIDS: counseling parents to reduce the risk,” American Family Physician, Leawood, KS, April 1998. [8] J. Csatari, “The beat goes down,” Men’s Health, Vol. 10, p23, USA, September 1995. [9] T. Fritz, “The Heart of bodybuilding,” Muscle & Fitness, USA, p77, October 1999. [10] C. Smith, “How to become your own personal trainer with the use of a heart rate monitor,” Fire Engineering, Vol. 149, p118, USA, June 1996.