1. Team 5 Ergonomic Sensor for PC Users Brian Dharmanto, Tam Hoang, Ahmed Almulhim, John Chhokar

2. Agenda  Problem Definition  The Design  Implementation  IP and Prior Work  Testing and Results  Contributions  Lessons Learned

3. Problem Definition  Number one injury in the office is caused from bad ergonomics.  Companies have started to express a lot of interest in ergonomics as employee lost day cases as increased.  Ergonomics in the workplace focuses on the health and well being of the employees.  Occupational Safety and Health Administration (OSHA) reports that improper viewing distances to the PC can cause eye strain that lead to headaches.

4. Problem Definition  American Optometric Association (AOA) state that 50- 90% of PC users experience Computer Vision Syndrome (CVS).  CVS is defined as a temporary condition resulting from focusing the eyes on a computer screen for uninterrupted periods of time.

5. Motivation  There is no device on the market that keeps the PC user accountable for operating the PC at a proper viewing distance  The objective is to create such a device that keeps the PC user at a good distance and as a result reduce CVS.  We will focus only on distances which are too close.  Companies are looking at software to improve ergonomics but have yet to come up with a hardware solution

6. Objective  Goal of the project is to design a working prototype  Secondly the design should be stable such that the user is aware of a bad viewing distance as soon as they approach dangerous viewing distances.  Lastly, the prototype should be at least as small a standard wireless USB mouse.

7. Alternative  Software:  Flux : Change the color of screen  Eye Defender: Remind user to take a rest after a given time  Screen Protector: Prevent direct expose to UV light

8. Requirement  Place the ultrasonic on the top of the screen, the sensor must look directly to face of user unless the device will send the incorrect warning.

9. Approach  6 steps :  Research  Sensor  Microcontroller code  Prototype  Schematic & Layout  Test

10. Agenda  Problem Definition  The Design  Implementation  IP and Prior Work  Testing and Results  Contributions  Lessons Learned

11. System Design

12. Zone Definitions  Green Zone (Safe) : ~ > 18 inches  Red Zone (Danger): ~ < 18 inches  Green Zone Upper Bound: ~ 55 inches

13. State Machine

14. Hardware Type: Microcontroller Atmega 328p 5 volt operating voltage 14 digital I/O pins Programming Language similar to C Cheap No debugging in code is only disadvantage

15. Hardware Type: Sensor Input PING Ultrasonic Sensor 5 volt operating voltage Relatively low cost Reliable results 3 pin interface

16. Hardware Type: Output LEDs 2 diffused 10mm LEDs 1 LED Bar Low current Cheap

17. Hardware Type: Speaker 8 Ω,.1w power Perfect for PCB Board Compact and Light

18. Measure the distance  The sensor emit a short 40Khz burst then listen for echo.  This burst travel with velocity = 1130 feet/second, hit the object and bounce back  The sensor provide an output pulse to terminate when the echo is detected. Therefore, the width of this pulse correspond to the distance

19. Code Program

20. Agenda  Problem Definition  The Design  Implementation  IP and Prior Work  Testing and Results  Contributions  Lessons Learned

21. Schematic

22. Dimensions  Board: 3.8inch x 2inch  Allowed: 4inch x 3.2inch  Altoids can: 3.5inch x 2.25inch

23. PCB Layout

24. Product Life Cycle

25. Agenda  Problem Definition  The Design  Implementation  IP and Prior Work  Testing and Results  Contributions  Lessons Learned

26. IP Arduino Development Board http://www.arduino.cc/http://www.arduino.cc/ - Used to upload software and debug Ping Sensor http://www.parallax.com/tabid/768/ProductID/92/Default.aspxhttp://www.parallax.com/tabid/768/ProductID/92/Default.aspx - Datasheet discusses formulas to calculate distances

27. Agenda  Problem Definition  The Design  Implementation  IP and Prior Work  Testing and Results  Contributions  Lessons Learned

28. Testing

29. Stress Testing

30. Agenda  Problem Definition  The Design  Implementation  IP and Prior Work  Testing and Results  Contributions  Lessons Learned

31. Individual Contributors (Ics) Brian Dharmanto  Schematic  Board  Component Solder Ahmed Almulhim  Component Solder  Design of board case  Prototype Tam Hoang  Software  Hardware  Design of sensor case John Chhokar  Software  Prototype  Wiki Admin

32. Agenda  Problem Definition  The Design  Implementation  IP and Prior Work  Testing and Results  Contributions  Lessons Learned

33. Lessons Learned  AhmedTam  - Software- Sensor Coding  - Solder- Software  - Case Design  John Brian  - SVN- PC BOARD Layout  - WIKI- EAGLE  - Case Design- SMT Solder

34. Project Schedule

35. DEMO