Group 15 Ma Be aN

1. Group 15MaBeaN Foot Pressure Monitoring System for a Speed Skater

2. Presentation Outline • Possibilities for further improvement • Division of labour • Self Education – Andrew, Ben, Matthew • Schedule / Milestones • Budget • Line • Category analysis • Social, Environmental and Enterprise Context • Conclusions • Project Objectives • Performance Specifications • Design Details • Hardware: • Parts list • Construction • Software • Information flow • Post-process flow • Results • Assessment of Design Performance • Evaluation of Results

3. Project Objectives • Improving a system to monitor foot pressure on the soles of speed skaters • Display pressure results alongside skater footage for use as a training tool to club level skaters • Ensure a minimum hindrance to the safety and performance of the speed skater • Skater stats (typical Kingston Striders skater) • Max velocity = 34km/h • Average stride duration = 720ms

4. Performance Specifications

5. Design Details - Components

6. Design Details – Parts List • Arduino Uno – Micro-controller chosen for project, has 6 analog and 16 digital inputs • Xbee Chip – employed for wireless communication • WiFi Shield: Shield designed to extend the Arduino Uno providing wireless capabilities • Dual Axis accelerometer: to determine the initial start of a speed skater • RTC: real time clock to provide a clock time stamp • 4051 Analog multiplexer: accepts the analog inputs of the force sensitive resistors • Resistors and holders: specific to each individual FSR; scaled to provide a scaled force output (components not to scale)

7. Design Details – Part List • Tekscan Force Sensitive Resistor (FSR) – used to evaluate the pressure exerted at a given point on the foot • Xbee base station chip: used to enable wireless capabilities of Arduino Uno • Base Station Shield: enables wireless Xbee chip to establish communication between a laptop and the Data Acquisition Pack.

8. Design Details

9. Design Details • Information Flowchart FSR resistance Arduino AnalogRead (all 8 sensors) Serial.println To Tx Xbee @ 38400 baud XBeepacketization and Tx Base Station Rx XBee COM Port Serial Buffer @ 38400 baud MATLAB Function WriteCSV Recorded .csv file

10. Design Details • Software Flowchart (Post processing) Loop Input .csv file & skater footage Extract sampling instance, interpolate values Draw sample and capture frame Align time index with skater footage Overlay pressure plot Capture frame Produce final .avi file

11. Design Details

12. Results

13. Results – Software • Simulation pressure profile video • Compiled from fictional .csv file • Uses MATLAB griddata(‘v4’) function to smoothly interpolate between the eight sensor locations

14. Results

15. Results

16. Results

17. Assessment of Design Performance

18. Assessment of Design Performance

19. Evaluation of Results

20. Possibilities For Further Improvement • Employ the accelerometer for further data acquisition beyond the current application of a trigger to start sending data when a speed skater starts moving • Inclusion of a triple axis accelerometer to measure acceleration in 3 degrees of movement for turn analysis • Separation of scaled resistors to outside the DAQPAC for ease of exchange and to ensure the DAQPAC seals tightly • Use of a rechargeable lithium battery pack system for greater battery life while minimizing the environmental footprint of the unit • Further refinements to the placement and number of sensors in the foot sensor system for greater resolution

21. Division of Labour and Team Effectiveness

22. Self Education – Matthew McKerroll • Digital and analog inputs work very differently, and both can be used for very different things • Much more can be extracted from resultant data then just pressures at given times, speed can be found as well as other things • A better understanding of circuits and how they interact with parts like processors and small IC’s

23. Self Education - Ben York • Choosing the best visualization method • Colour blindness • Ease of interpretation for youth audience • Fail fast design • Build a prototype early, learn from it, then move on • Considering transient behaviour of ICs • When trying to maximize the sampling rate, components (i.e. MUX) do not behave instantaneously • Weekly meeting with supervisors • A source of unrivalled brainstorming and suggestions for improvement

24. Self Education – Andrew Yaworski

25. Schedule / MilestonesOverall Project Timeline

26. Schedule / MilestonesHardware Timeline

27. Schedule / MilestonesSoftware Timeline

28. Budget – Line Item Review

29. Budget – Category Breakdown • Analysis of the budget provides insight into the limitations due to component cost • FSR Sensors: 33% • Wireless Components: 22% • Peripheral Components: 20 % • Taxes / Shipping: 17% • Microcontroller: 7%

30. Social, Environmental and Enterprise Context • The device made already exists but can cost more than $10 000 dollars. The one made for this project is meant for the club level of skating – many uses, cost effective • Other applications of this project include heath-care and rehabilitation • This project has little to no environmental impact, but changes could be made so that it is more environmentally friendly

31. Conclusions