Wearable systems management of Information and communication

Wearable systems

1. Wearable Systems
Chapter 2
Wearable Sensors
Dr. SHU Lin
[email protected]
2023/9/28
South China University of Technology

2. Design Methodology

2
1. Sensors
2. DAQ
3. iot
4. Interaction
6. Energy management
7. App and algorithms
8. Cloud computing
5. Display
4

3. 5
Contents of the Course
Chapter Time
Contents
1 2 hoursIntroduction to Wearable Systems
2 4 hoursWearable Sensors (homework)
3 4 hoursWearable Data Acquisition (homework)
4 2 hoursWearable Wireless Transmission
5 4 hoursWearable Energy Management (homework)
6 2 hoursWearable Dispaly
7 2 hoursWearable interactive techniques
8 4 hoursAlgorithms of Wearable Systems
9 4 hours
Case Study of Wearable Systems (VR, smart bracelet, smart wireless shoe,
etc.)
10 2 hoursExamination report and presentation

4. 6
Q1:
What are the wearable sensors used for?
What are the major wearable sensors?

5. Environment parameters:
Temperature, humidity, air quality,
, UV, altitude, light, noise
Body health parameters
o ECG, HR
oEEG
o Blood pressure, Spo2
o Blood glucose
o Perspiration
o EOG EMG
And many more…
Wearable sensing parameters
Glasses
Watch
Bracelet
Ring
Gloves
Clothing
Pants
Intimate apparel
Belt
Shoe
Insole
Hat
Headset
Earphone
Necklace
Brooch
Skin patches
7
Body physical parameters:
GPS, acceleration, speech,
Facial expressions/Video,
Force/muscle movement,
activity states, foot pressure

6. Sensor selection parameters
1.Measurement Range
2.Sensitivity
3.Linearity
4.Hysteresis
5.Repeatability
6.Resolution
7.Stability
8.Drift
9.Accuracy 10. Cost…..
Error：
δ=ΔYmax/ Y*100%
广州市人体数据科学重点实验室
广东省人体数据科学工程技术中
心
10

7. Sensor selection parameters
1.Measurement Range
2.Sensitivity
3.Linearity
4.Hysteresis
5.Repeatability
6.Resolution
7.Stability
8.Drift
9.Accuracy 10. Cost…..
广州市人体数据科学重点实验室
广东省人体数据科学工程技术中
心
10

8. Sensitivity and Accuracy
8

9. Offset & Linearity
9

10. 10
Error：
δ=ΔYmax/ Y*100%

11. 8
Temperature & Humidity sensor

12. 9
RTD
Thermistor
RTD-809

13. 10
Temperature & Humidity
Digital sensor, Price：around 100RMB

14. 11
Temperature & Humidity

15. 12

16. •ST LIS331DL
•3-axis 2g/ 8g user selectable
•MEMS-CMOS process
•Output data rate of 100Hz and 400Hz
Acceleration
13

17. 14
Accelerometer: Bosch SMB 380
•Triaxial ±2g/ ±4g/ ±8g/
•bandwidth 25-1500Hz
•Internal acceleration evaluation for
interrupt trigger also enabling stand-
alone capability (without use of
microcontroller), self-test
•Application:
► HDD protection
► Menu scrolling, tap / tap-tap
function
► Gaming
► Pedometer
► Drop detection for warranty
logging
► Display profile switching
► Advanced system power
management for mobile applications
► Shock Detection
Acceleration

18. 18
Q2:
What are the outputs of a acceleration
sensor under the conditions of:
1.Stillness Z=-1G?
2.Free falling 0?

19. 15
Accelerometer: Bosch BME250
Acceleration

20. 16
Acceleration-Myomotion

21. Kinematics Variables
Ankle joint angle
Plantar Flexion/Dorsiflexion
Adduction/Abduction
Inversion/Eversion
17
NeutralPlantar Flexion Dorsiflexion
Inversion Eversion
Inversion
Adduction
Abduction

22. Kinematics Variables
Ankle joint angle
Supination (plantar flexion, adduction,
inversion)
Pronation (dorsiflexion, abduction, eversion)
17
NeutralPronation Supination
Over
Supination
Over
Pronation
Medial Lateral Medial LateralMedial Lateral

23. Kinematics Variables
Knee joint angle
Flexion/Extension
Internal rotation/External rotation
18
α
Flexion Extension
Valgus
Genu valgum
(膝外翻)
(knock-knee)
Varus
Genu verum
(膝内翻)
(bowleg)
Neutral

24. Kinematics Variables
Hip joint angle
Flexion/Extension
Abduction/Adduction
Internal rotation/External rotation
24
旋内 旋外 屈伸 外展/内收

25. Kinematics Variables
25

26. Kinematics Variables
26

27. Kinematics Variables
27

28. Kinematics Variables
Max Angle
Min Angle
ROM
IC/TO Angle
28

29. Gyroscope
•Different definitions and concepts
around:
1.“A gyroscope is a device for
measuring or maintaining
orientation, based on the principles
of angular momentum”. (wikipedia)
2.Measuring the angular rate [rad/sec] exploiting
the Coriolis force (in vibratory gyroscope)

30. 30
Gyroscope, Example
•IDG-650 InvenSense
•2-axis
•2000  /sat 0.5mV/  /s
•440/sat2.27mV/ /s
•Size: 4 x 5 x 1.2mm, 28pin
•Application
► Vehicle motion analysis
► Platform stabilization
► gaming
► image stabilisation
► GPS navigation (dead reckoning)
Wii Motion Plus

31. Geo-Location
•Outdoor: GPS
► Accuracy outdoor< 5m (horizontally)
► assisted GPS: < 10cm
► Min 4 Satellites to calculate
longitude, latitude, altitude, exact time
► Power: 20 – 100mW
GPS Compendium u-blox 2009
•Indoor:
► Ultra Sound: reflection
► WiFi radio signal strength (RSSI)
► SLAM: Simultaneous Localisation and Mapping (SLAM)
► Social nets
小天才儿童手表

32. 32

33. 33
Q3:
How many sensors are there in this
system and what sensors are they？

34. 34
Heart Rate - Optical sensor

35. 35

36. 36

37. 37
blood vessel
Skin
Skin
blood vessel
Green light
Red light

38. 38
Heart Rate – ECG electrode

39. 39
Q4: Discussion
Design a system to detect emotions
group discussion (10 minutes)

40. 40
Q5: Quiz

41. 41
Homework:
1.Survey on the sensors of the
major wearable products
（choose one product）：sensor
types, specifications,
functions and so on (you can
choose the product of the
following slides)
2.Prepare 5-minute slides on the
survey, and give a
presentation next week.

42. 2
March 2nd
2017
Huawei Watch 2
March 2nd
2017
iWatch 3
A History of Wearables：2016-
2017
June 2nd
2016
MI Band 2
May，2017
FitBit Alta HR
Sep
2016
Sungsum Gear S3
Sep 29，2017
Garmin fēnix 5S

43. Dec 5th
2019
Huawei Band 4 Pro
A History of Wearables：2019
June 11st
2019
MI Band 4
Feb 21st 2019
Galaxy Fit
Sep 11st 2019
Apple Watch Series 5
Aug 27th 2019
Amazfit GTS
Nov 25th 2019
Huawei Watch GT 2

44. 3
2016
LiNing & XiaoMi
A History of Wearables：2016-
2017
Nov2016
NIKE Mag
March，2017
Under Armour
Jan 2017
Polar H10