DESIGN REVIEW DESIGN REVIEW Mason Verbridge Evan McNamara Steve Fleischmann Artem Sivak P11032 Detail

DESIGN DESIGN REVIEW REVIEW

Mason VerbridgeEvan McNamaraSteve FleischmannArtem Sivak

P11032P11032

DetailDetail

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OutlineOutline

ObjectivesElectrical RundownMechanical RundownFeasibility AnalysisPreliminary Test PlanUpdated Risk PlanConclusion

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ObjectivesObjectives

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

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

Electrical RundownElectrical Rundown

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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

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Electrical Rundown: Power Electrical Rundown: Power ConsumptionConsumption

Information 1. 3 Modes of Operation:

Transmit, Wait, Sleep2. Each mode uses drastically

less power.3. System spends 20 seconds

in Wait mode.4. Average time spent on a

slide is ~3 minutes.

Assumptions1.Average time spent on a slide is only 30 seconds.2.A button press (Transmit mode) lasts 1 second.

Calculations:

Background1.Current measurements taken over a range of operating voltages.2.Battery range determined by functionality at 30 feet.

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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

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Mechanical RundownMechanical 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...

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Button Type:

Aluminum “Level Switches

”

WheelBlack

“Rocker Switch”

Toggle Switch

White Buttons

Votes: 3 0 3 1 6

Comments:

Easy to push

Easy pressing

Small and lightweig

ht?

Comfortable to press

SICKKK!!!Small and

easy

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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? NO YES

6 5

The wristband feels comfortable on the wrist

Don’t like wearing anything on the wrist

Will be alright if it’s smallMight hinder signing due to

size

Wouldn’t have to go back to the computer if presenting alone

Might be distracting to others?

If the wristband bothers me, I can just take it off

Distracting

Just like a watch

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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.

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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

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Alternative Model

Pros•Smaller Housing•Possible better wrist conformityCons•Vertical Configuration•Easier Damaged?•Bad Fit for small wrists

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Component Detail Qty

Housing

Aluminum Box (Top)Mason will machine the top

portion of the housing1

Aluminum Box (Bottom)Mason will machine the bottom

portion of the housing1

Button Switch

Small push buttons that will go on the top of the housing and will be responsible for moving the slides back and forth. Will

have caps on them.

2

Button CapNice tactile feel caps for the

buttons2

Power SwitchA small toggle switch that will

turn the device on and off1

Battery HolderA watch battery holder that will

power the circuitry1

Battery Cover

A cover that will go on the bottom of the housing that will allow the user to easily change

the battery

1

Fastening Screw

A screw that will hold the housing together. Will also

attach the board to the housing.

2?

Circuit Board from a ClickerModified circuitry board from

an existing clicker1

WireSome wire to be used during soldering of the buttons to the

board1

Band

Valcro BandA stretchable band with valcro

on it12in

D LoopA metal loop that will go on the

end of the band to allow for easy fastening

1

Watch Pins

Pins that will allow the band to be attached to the housing.

Will also allow the customer to attach his own band.

2

Bill of Materials

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Feasibility AnalysisFeasibility Analysis

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Updated Risk PlanUpdated Risk Plan

Please refer to the packet for the Updated Risk Plan.

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Preliminary Test PlanPreliminary Test Plan

Test Number

Specification Description Threshold Target Pass/Fail

1 Device will be under 0.5 pound(s). 0.5 lbs 0.4 lbs

2 Device will allow full range of natural motion, including excessive hand motion and roaming the presentation area. (No wires or restrictive components)

N/A N/A

3 Maximum Size will be less than 24 cubic inches.

24 in^3 10 in^3

4 Device can sustain multiple drops from waist height (~3ft) onto carpeted surface.

10 drops 20 drops

5 Device will allow ASL to be utilized without major interference.

N/A N/A

6 Device will not progress to next slide, or return to previous slide, without intentional activation.

N/A N/A

7 Device will work within a range of minimum of 40 feet from PC without problem.

40 ft 50 ft

8 Device will be implemented for minimum cost.

N/A N/A

9 Battery life will exceed 4 hours of continual usage.

4 hrs 5 hrs

10 Latency between button push and slide change will be less than 0.75s

0.75 s 0.5 s

11 Device successfully advances to next and previous slides.

N/A N/A

12 The device will be safe to use for as wide of the population as possible.

N/A N/A

Refer to packet for a detailed Test Plan.

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Thanks!Thanks!

Documents

DESIGN REVIEW DESIGN REVIEW Mason Verbridge Evan McNamara Steve Fleischmann Artem Sivak P11032 Detail