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Design Review

Detail. Design Review. Mason Verbridge Evan McNamara Steve Fleischmann Artem Sivak. P11032. Outline. Objectives Electrical Rundown Mechanical Rundown Feasibility Analysis Preliminary Test Plan Updated Risk Plan Conclusion. Objectives.

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Design Review

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  1. Detail Design Review Mason Verbridge Evan McNamara Steve Fleischmann ArtemSivak P11032

  2. Outline • Objectives • Electrical Rundown • Mechanical Rundown • Feasibility Analysis • Preliminary Test Plan • Updated Risk Plan • Conclusion

  3. Objectives Obtain approval (from all stakeholders) regarding the process and selection of a detailed electrical and mechanical design.

  4. Electrical Rundown • Hardware Investigation • 3 remotes ordered and inspected • Board size, additional features noted • 'Pen style' remote was chosen for use in the unit

  5. Electrical Rundown Board functionality • 1.5V AAA battery is boosted to supply 5V for the microcontroller • Power electronics behave favorably with 3V applied • Removed Laser and associated button • Attempting to remove antenna portion of board to reduce size, use a non-PCB antenna if needed

  6. Electrical Rundown: Power Consumption • Assumptions • Average time spent on a slide is only 30 seconds. • A button press (Transmit mode) lasts 1 second. Information 1. 3 Modes of Operation: Transmit, Wait, Sleep 2. Each mode uses drastically less power. 3. System spends 20 seconds in Wait mode. 4. Average time spent on a slide is ~3 minutes. • Background • Current measurements taken over a range of operating voltages. • Battery range determined by functionality at 30 feet. Calculations:

  7. Electrical Rundown

  8. Electrical Rundown Button Investigation • Small, momentary, return-to-center buttons were desired for initial testing • Digikey searches yielded many small-sized options • Trip to Goldcrest yielded mostly larger sized options

  9. Mechanical Rundown • Based on Systems Review, 2 prototypes have been created to test for button functionality. • Thirteen Deaf/Hard of Hearing students were asked to provide feedback. Here are the results...

  10. Mechanical Rundown

  11. Mechanical Rundown We used the opportunity to get feed back on the wristband regarding ASL interference: Do you feel like the wristband hinders your ability using ASL?

  12. Mechanical Rundown Feedback End Thoughts • Most Liked Button Type = White Buttons on the Top Face • Misunderstanding of the Device's Ending Size • Complaints about the device being distracting during signing Based on the feedback, our focus should be: • Recessed, dual (two-button) press-type button configuration oriented on the top face.  • Minimization of size and distraction factor/flare.

  13. Mechanical Rundown Primary Model Recessed Two Push-Button Design • Pros • Easy to Press Buttons • Recessed to prevent • false triggers • Swivel Band Mounts • for extra comfort • Single case for extra • strength

  14. Mechanical Rundown

  15. Mechanical Rundown

  16. Mechanical Rundown Alternative Model • Pros • Smaller Housing • Possible better wrist conformity • Cons • Vertical Configuration • Easier Damaged? • Bad Fit for  small wrists

  17. Mechanical Rundown Bill of Materials

  18. Feasibility Analysis

  19. Updated Risk Plan Please refer to the packet for the Updated Risk Plan.

  20. Preliminary Test Plan Refer to packet for a detailed Test Plan.

  21. Thanks!

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