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DESIGN DESIGN REVIEW REVIEW
Mason VerbridgeEvan McNamaraSteve FleischmannArtem Sivak
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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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Electrical RundownElectrical 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
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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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Electrical RundownElectrical Rundown
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Electrical RundownElectrical 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
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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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Mechanical RundownMechanical Rundown
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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Mechanical RundownMechanical 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? 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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Mechanical RundownMechanical 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.
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Mechanical RundownMechanical 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
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Mechanical RundownMechanical Rundown
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Mechanical RundownMechanical Rundown
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Mechanical RundownMechanical Rundown
Alternative Model
Pros•Smaller Housing•Possible better wrist conformityCons•Vertical Configuration•Easier Damaged?•Bad Fit for small wrists
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Mechanical RundownMechanical Rundown
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!
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