1. Skin Color Monitor Client: John G. Webster, Ph.D. Advisor: William L. Murphy, Ph.D. Team Hotflash Jack Ho – Team Leader Joseph Yuen – BWIG Brian Ginter – BSAC Patrick Kurkiewicz – Communications

2. Outline • Problem Statement • Background • Current Devices • Design Constraints • Design Ideas • Design Matrix • Circuitry • Future Work

3. Problem Statement • Detecting hot flashes • Change in skin color • Wearable monitoring device • Comfort • Used in therapeutic drug testing

4. Background Information • Hot flashes • Occur during menopause • Are marked by feeling of intense heat and sweating • Device • When capillaries fill with blood, skin changes color • Device measures differences in skin color, denoting a hot flash • Device stores data for use in research and drug testing

5. Current Devices • BIOLOG Hot Flash Monitor • Heavy (200 g) • Bulky (3.3 x 7 x 13 cm) • Runs wires from electrodes to belt monitor device • 24 hour battery life • Expensive • Monitor - $2200 • Software - $2000 • http://www.ufiservingscience.com/HFMon1.html

6. Design Constraints • Size • < 6 cm x 6 cm x 1 cm • Weight • < 50 g • Comfort & Attachment • No sharp edges, non-irritant • Price • < $7 USD • Appearance • Small, Sleek, Smooth

7. Design 1 (barrier) • Material • Hard Plastic • Distance from Skin • Ideally 2mm

8. Pros and Cons Cons • Harder, more rigid plastic • Harder to shape • Still could be more focused Pros • Firm sturdy shape • More durable

9. Design 2 (cave design) • Material • Firm rubber (like an eraser) • Distance from Skin • Ideally 2mm

10. Pros and Cons Pros • Smooth Shape (less noticeable) • Rubbery (more comfortable • Low Cost (parts about $5) • Cons • Light could be more focused. • Monitor may bend/flex (causing different readings from PD)

11. Design 3 (laser) • Material • Hard plastic

12. Pros and Cons Cons • Laser diode may be expensive • Laser potentially dangerous Pros • Light source and receiver is on same side • No barrier needed – all light received will be from skin reflection

13. Design Matrix

14. Circuitry • Base circuitry • LED’s • Photodiodes • Op Amps

15. Future Work • Discuss with client • Choose design • Work on circuit model • Begin testing • Prototype

16. Questions?

17. References • UFI Hot flash monitoring tools, electrodes, and accessories. http://www.ufiservingscience.com/HFMon1.html