Developing for Simband

Simband is a new open platform for innovation in digital health. We will describe the principles that drove our design decisions around building a sensor module to read bio-signals from your wrist. These biometric sensors have never been combined and synchronized before. We will explain how engineers can create new sensor modules based on our reference design, how to integrate with our hardware from a mechanical and electrical point of view. We will show you how we created algorithms that read the bio-signals and turns them into meaningful information for the user and how developers can do the same and push the boundaries of personal health and wellness.

Transcript

1. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com Developing for Simband Insight into Building Breakthrough Sensors Jim Schuessler Andrea Trasatti
2. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 2 • Simband hardware overview  Mechanical  Electrical • Simband software overview  Sensor data  Visualize data  Live demo  SAMI integration • Working with Simband, working with us • Q&A
3. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com Developing for Simband Hardware overview Jim Schuessler
4. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 4 Inside Simband • Base unit provides the “infrastructure” to support a wide variety of sensor modules  Communications to SAMI  User interfaces  Internal power and data interfaces • The “Bucket” is the mechanical and electrical interface to sensor modules Simband is a modular PLATFORM Base Clasp The Bucket Active Band
5. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 5 Simsense Reference sensor module at the anterior side of the wrist Samsung’s Reference Sensor Module: Simsense Photo Plethsmography (PPG) Bio-impedance (BioZ) Galvanic Skin Response (GSR) Accelerometer Skin Temperature Electro-cardiogram (ECG) All time synchronized
6. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 6 Simsense • Sensor position designed with anatomy in mind  Optical sensors over ulnar artery • Multiple channels of photo- plethysmography (PPG) • Colors tend to reflect at different depths  Bio-Impedance (Bio-Z) targets the radial artery  Active clasp closes ECG loop • Finger touch from opposite hand Reference sensor module at the anterior side of the wrist Radial artery Ulnar artery
7. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 7 Mechanical Construction • Athena = active sensor layer  Flexible PCB with electrodes, optical elements and other sensors • Apollo = front-end processing electronics  Over 600mm2 surface area available Materials and Assembly Stack-up
8. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 8 Powerful processing resources 1. Dual processor architecture  Bio-processor front end (M0)  Floating point, secure backend (M4F) 2. Serial Peripheral Interconnect (SPI) Data Interface + Interrupt line from Sensor Module to Base Unit + Reset line from Base Unit to Sensor Module 3. Battery power from Base Unit Versatile architecture offers power optimization Full System Diagram
9. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 9 Simple, Standard Electrical Interfaces • SPI is available on every MCU in the world  Easy to develop for • Bandwidth  We use 2Mb/s • ECG lead 2 from clasp SPI and direct battery power The Bucket Simband S_MOSI S_MISO S_CLK S_RST S_INT S_CS ECG2 Res.(3) V+ GND Sensor Module Connector Host System Band Flex Cable
10. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 10 Power Interface • Essentially? How direct?  Coulomb counter monitors SM power usage  Switch allows Base Unit to control SM power • Limits are a balance between SM freedom and safety to Base Unit  100mA peak  50mWhr (averaged over 24hrs.) Essentially a direct connection to the battery Base Unit Sensor Module
11. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 11 Q & A Jim Schuessler jim.s@samsung.com @Jim_Schuessler
12. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com Developing for Simband Software overview Andrea Trasatti
13. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 13 Designed to support different data from different sensors
14. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 14
15. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 15 Sensor data • We define the data coming from each sensor as a stream • Each stream has a set of characteristics that depend on the sensor and the data it generates • Everything is time-coded and synchronized
16. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 16 Blood pressure Algorithm gettimestamps send Writing an algorithm
17. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 17 Data streams • Heart rate • Heart rate variability • Blood pressure • Confidence Indicator • Steps (increments) • Steps (daily) • Activity (walking, running, etc.) Simband streams from algorithms
18. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 18 Confidence Indicator • Rate the curve of the signal from 1 to 4 • Analyze the stream and compare with our model All streams from Simsense are graded Grade Definition 4 All features visible, very low noise 3 Key features visible, low noise 2 Marginal, noisy 1 Anomalies and a lot of noise
19. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 19 Confidence Indicator Confidence Indicator 1 Confidence Indicator 4
20. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 20 Who wants to see a live demo?
21. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 21 Simband <3 SAMIIO
22. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 22 Working with Simband, Working with us • Yesterday we officially opening our ecosystem to the world • Our agenda is very simple: work together to build a better digital health platform • Simband source code will be available to everyone
23. © 2014 Samsung Developer Conference. All rights reserved. www.samsungdevcon.com 23 Let’s keep talking Read about Simband at http://www.voiceofthebody.io Andrea Trasatti – @AndreaTrasatti Jim Schuessler – @Jim_Schuessler Follow us on Twitter @voiceofthebody