System
DESIGN
REVIEW
Mason Verbridge
Evan McNamara
Steve Fleischmann
Artem Sivak

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Outline
2
Objectives
Work Breakdown
List of Customer Needs
System Specifications
Concept Selection Flow-down
Concept Selection Matrices
Form Factor / Concept Topologies
Alternative Usage Layouts
Benchmarks and Input
Going Forward
Wrap-up

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Objectives
3
Obtain input and direction (from all stakeholders)
regarding the process and selection of a final
concept, as well as suggestions on our current
form factor.
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Work Breakdown Structure
4
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Customer Needs
5

Initial Needs Outlined With Customer

Needs Prioritized and Refined by
Customer.
Priority
High
Moves PowerPoint to "Next" or
"Previous" Slide
Hands Available for Signing
Upper Body Mobility
Quick and Intuitive to Operate
Viable Classroom Range
Lightweight / Unobtrusive
Durable
Cost-Effective
Good Battery Life
Low
No False Triggers
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System Specifications
6
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Specifications were
developed to meet and/or
exceed customer needs.
Each specification is
quantifiable and testable
Actual test plan / test
specification to be
constructed at a later date
Device weighs under 0.5 pound
User Maintains Full Range of Motion
Device is of Minimum Size
Device Survives Drop Test of 0.75m
User is not Hindered From Performing ASL
Device Produces No False Triggers
Device has 40ft. Minimum Range
Project Completed Under Budget
Device Has a 2 hr. Minimum Battery Life
Device Does Not Interfere With Other Classroom Devices (RF)
Device has a latency of Less than 0.75seconds
Device is One-Size-Fits-All
Device Successfully Advances to the "Next" or "Previous" Slide
Instructions to Operate is less then 10 steps
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Concept Selection Flow-down
(See Appendix B)
7
Initial Selection Table
Narrowed 10 concepts to 5
Using Pugh Chart
Concepts -> HOQ, graded
vs. weighted specs
Narrowed to 3 concepts
Analyzed against risks
Current Concept
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Concept Selection/Generation
8
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Concept Selection/Generation
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Concept Selection/Generation
10
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Benchmarks, Input, and the Bottom
Line
11
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David M. - “Right now I usually have someone else press the "next" button but it gets
annoying having to give them a cue, not to mention it detracts from the smoothness of the
presentation. This is of course unless the "button presser" is a teammate I've practiced with
and they know WHEN to click- and in that case it’s not always perfect since when I'm
spontaneous and add more information than we had rehearsed they may mistakenly jump
ahead to the next slide.”
Avi H. – “If it's the size and weight of a watch, it won't hinder my signing at all.”
Adam N. – “I've never presented an entire presentation in ASL because I've always
talked… Lately, I've been signing a lot more and trying not to talk as much either… A
wristband actually sounds extremely nice.”
Greg B. – “Currently, there are two ways I can do a presentation. 1) Have a volunteer
stand at the computer waiting for my signal to change the slides. 2) Pause at every slide to
change it myself, either using the computer or picking up a wireless remote. It would
definitely be nice to streamline the experience. [ A wristband] would work very well, and
would not be distracting as long as the profile is small/slim.”
Emily S. – “[A wristband would work] since I pretty much always have something on my
wrist no matter what.”
It’s clear to see that implementing a wrist-based solution would be highly useful to ASL
users!
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Questions, Comments, Concerns?
12
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Form Factor
13
Thus far four basic layouts have been examined.
They are as follows...
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Concept 1
14
Pros:

Out-of-the-way sidemounted switch
Cons:
Possible interference
with clothing
Size (depth of switch)
Left vs. Right hand
interference

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Concept 2
15
Pros:

Intuitive
Cons:
Possible False Triggers
Requires finger dexterity
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Concept 3
16
Pros:
Quick trigger method
Intuitive
Usability for dexterity
impaired

Cons:
Possible False Triggers
Switch Sensitivity
Size (depth of switch)
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Concept 4
17
Pros:
Reduction of False
Triggers
Intuitive
Usability for dexterity
impaired

Cons:
Bulky
Moving Parts (long term
reliability)
Possibly Fragile

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Possible Feature Expansion
18
Laser Pointer
Start Presentation Button
Mouse Control
Volume Control

Features may be added, at
the expense to overall device
size
 Feature selection will be
driven by customer input

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Concept Review
19
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Alternative Usage Surfaces
20
A
‘C
‘B
B
C
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Thoughts and Discussion
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Likes?

Dislikes?
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Comments?
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Concerns?

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Recap
22
Concept Discussion Overview

User Interface Discussion Overview
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Going Forward
23

Gantt Chart / Project Plan (Appendix D)
 Feasibility Studies
 Test Plan
 Prepare for week 9 design review
Risk Assessment (Appendix C)

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Thank You For Your Time!
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Risk Assesment
25
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Power Consumption
26
What We Have
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•
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System Runs on 3V, provided via two
AAA batteries.
Testing has shown that the unit will
run without major issue until
approximately 2.2V. (Laser pointer
begins to dim, but no other effects)
Further analysis shows that the unit
will consume a maximum of ~7mA.
Max current condition occurs on
button press when laser pointer is
active.
Idle system consumes current on the
order of µA.
Assumptions & What We
Know
•
•
•
•
•
System will only work down to
2.4V. (No noticeable fall-off in
testing up to this point)
The system is constantly drawing
10mA of current – a vast safe
margin.
The above makes it clear that the
unit is continuously utilizing 30mW
of power.
Minimally sized watch/hearing aid
batteries estimate a lifetime of 150
mili-Amp Hours.
This means that even an
extremely small battery will give
us 15+ hours of usability!
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Gantt Chart
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House Of Quality
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House Of Quality
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