1. Wearable Electronic Device Design for Preventive Health Care-Related Purposes Supervisor: Jörg Ott Author: Todor Aleksandrov Ginchev, 23 November 2015

2. Outline  1. Introduction.  2. The PRECIOUS Project.  3. Smartphone solution.  4. Wearable design and fabrication.  5. Conclusion and future work.

3. 1. Introduction  Fact: most of the human biometric data are nowadays unknown.  Physical activity, food intake, sleep quality, mood or even environmental data.  Issue: without this biometric data, preventing and diagnosing diseases is more challenging.  Even when this data is available, it is still hard to find correlation between a certain lifestyle and a risk of getting a disease or diagnosing an existing one.  It is therefore difficult to obtain individual-specific healthcare recommendations.  There is a need of 24/7 individual health-related habits monitoring.  Available for everyone, everywhere, at very low cost.  There is a need of someone or something to process the biometric data.  Detect unhealthy lifestyle and provide individual feedback.  Available for everyone, everywhere, at very low cost.

4. 2. The PRECIOUS system  PREventive Care Infrastructure based On Ubiquitous Sensing.  Use technology for:  Obtaining the biometric data.  Processing the data.  Providing feedback.  Keeping the individual motivated.  Available for everyone, everywhere, at very low cost.  Virtual Individual Model (VIM).  The healthcare projection of the digital “me”.  It stores different health-related parameters.  Accessible by machine learning algorithms.

5. 2.1 The PRECIOUS network

6. 3. Smartphone solution  Biometric data can be continuously measured by electronic devices.  Smartphones and wearables have sensors capable of:  Physical activity tracking.  Sleep duration estimation.  Food intake monitoring.  Location tracking.  Connection to server allows sending and retrieving data from the VIM server.  Smartphone’s screen provides feedback and recommendations.

7. 3.1 Food intake monitoring  Food data can be stored in different ways.  Typing the name of the food.  Scanning a barcode of a product.  Taking a photo of the food. Green mask Yellow mask Orange mask Green object Yellow object 1 Ignore Border detection Yellow object 2 Color balance Contour matching Input image Output image: two bananas detected

8. 4. Wearable design and fabrication  Smartphones…  Do not measure the physical activity data continuously.  Cannot measure the sleep quality.  Storing food intake takes time.  Reduces user motivation to track their food intake.  One solution is to use a smartwatch with integrated camera.  But they are very expensive.  There is a need of a cheap device, capable of measuring several biometric parameters and storing them in the cloud.

9. 4.1 First prototype  On prototype board.  Widely used and cheap components.  Faster development.  Low final product price.  Test and verification of each module.  Test and verification of the whole system.

10. 4.2 Second prototype design  Design on Printed Circuit Board.  Same modules and components.  Different encapsulation or format.

11. 4.2.1 Second prototype: fabrication in home environment  Homemade fabrication environment (toner transfer).  Print layout on paper.  Transfer the pattern to the Cu layer using heat.  Fix imperfections with special pen.  Etch Cu.  Remove residues.  Check.  Issues with resolution.  Difficult to solder.  Digital camera.  MEMS module.  Suitable for testing.

12. 4.2.2 Second prototype: fabrication in laboratory environment  Professional environment (photolithography at Aalto Design Factory).  Print layout on transparent foil (photomask).  Transfer pattern on the photoresist (lithography).  Develop, etch and finally remove photoresist.

13. 4.2.3 Second prototype: soldering  Smallest components were 0.4mm X 0.2mm SMD capacitors.  Most difficult to solder were the MEMS and camera module.  No issues during soldering.

14. 4.3 Fabrication results and verification  Fabrication was successful.  Proper interconnection checked.  Not connected.  Short circuit.  Temporal wires.  In-circuit programming.  Verification was successful.  Proper reading of sensors.  Proper Bluetooth connection.

15. 5. Conclusion and future work  Goals in the scope of The PRECIOUS Project.  Monitor human being biometric data 24/7.  Send data to a centralized server.  Goal were fulfilled.  Low cost device (cost of materials was around 25€).  Open solution (everyone can fabricate it).  Future work.  Battery power management.  3D printing of the wearable box.  Flexible Printed Circuit Board.