Wearable Electronic Device Design for

Preventive Health Care-Related Purposes

Supervisor: Jörg OttAuthor: Todor Aleksandrov Ginchev,

23 November 2015

Outline

1. Introduction.

2. The PRECIOUS Project.

3. Smartphone solution.

4. Wearable design and fabrication.

5. Conclusion and future work.

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.

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.

2.1 The PRECIOUS network

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.

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

Ignore

Border detection

Yellow object 2

Color balance

Contour matching Contour matching

Input image

Output image: two bananas detected

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.

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.

4.2 Second prototype design

Design on Printed Circuit Board.

Same modules and components.

Different encapsulation or format.

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.

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.

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.

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.

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.