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M E A M S e n i o r D e s i g n F i n a l P r e s e n t a t i o n
A p r i l 1 8 t h , 2 0 1 6 | 9 : 5 5 A M
H o u s t o n H a l l o f F l a g s
s
J u l i a H e g a r t y | J a m e s L o ve y | J o s e p h M c C l o s k e y
D a v i d S h i e l d s | B r e n n a n S p i n n i e
10% of blind children are braille literate
50% of blind students don’t complete high school
70% of blind adults are unemployed
[1]
Braille is a tool for Empowerment
Audiodoes not provide
an active
experience
Printedmaterials require
an instructor
Electronicrefreshable
displays cost
$2000-$10,000+
[2]
The K.Dots Device
K. Dots is an early educational tool for blind
students that provides an active braille learning
experience at an affordable cost.
Improving Access
Improving Access
Improving Access
Improving Access
Device Metrics
SizeBraille characters are standard sized
0.1” x 0.2” cells
Correct characters are produced repeatedly
100% subsystem & integrated reliability
Accessible price for children’s device
$280 if mass produced [3]
Fast enough to be a flashcard device
2.35 second refresh for 8 characters
Reliability
Cost
Refresh Time
K.Dot’s Unique SolutionP
in
SledSledSled Pin
Pin
Pin
Pusher
System Overview
Outer Dot
Interface
Pin Pusher
Assembly
Drive
System
System Overview
Outer Dot
Interface
Pin Pusher
Assembly
Drive
System
Outer Dot Interface
ConceptDisplay 48 binary-state braille dots
• 48 individual 3D-
printed pins
• Pin housing
• Universal “sled”
latching mechanism
Barriersfor constraint
Outer Dot Interface
Concentric Alignment
System Overview
Outer Dot
Interface
Pin Pusher
Assembly
Drive
System
Pin Pusher Assembly
ConceptActuate one column of braille text at a time
• 3 horizontally mounted
push-pull solenoids
• 3 output pin pushers
• Scott Russell linkage
% of cycle
Pin Pusher Assembly
System Overview
Outer Dot
Interface
Pin Pusher
Assembly
Drive
System
Drive System
ConceptMove pin pusher assembly from column to column
• Stepper motor drives
pre-tensioned belt
• Limit switch stops
motion
• Button resets to zero
position
Integration of Subsystems
Evaluating the K.Dots Device
Size
Reliability
Cost
Refresh
Time
Evaluating the K.Dots Device
Strict adherence to standards of the
National Federation for the Blind
[4]
Size
Reliability
Cost
Refresh
Time
Size
Evaluating the K.Dots Device
Pushers within
tolerance for
79%of stops
Size
Reliability
Refresh
Time
Reliability
Cost
81% of pins
successfully
reset
Evaluating the K.Dots Device
Part CategoryMaterial/
Assembly Cost
Injection molded $7.27
Mechanical $132.33
Electronic $33.90
Total $173.51
Size
Reliability
Cost
Refresh
Time
Cost
Evaluating the K.Dots Device
𝑮𝒐𝒂𝒍
(40𝑏𝑟𝑎𝑖𝑙𝑙𝑒 𝑤𝑜𝑟𝑑𝑠
𝑚𝑖𝑛𝑢𝑡𝑒𝑥 5.1
𝑐ℎ𝑎𝑟𝑎𝑐𝑡𝑒𝑟𝑠
𝑤𝑜𝑟𝑑x
1
60
𝑚𝑖𝑛𝑢𝑡𝑒𝑠
𝑠𝑒𝑐𝑜𝑛𝑑) =
𝟖 𝒄𝒉𝒂𝒓𝒂𝒄𝒕𝒆𝒓𝒔 𝒑𝒆𝒓 𝟐. 𝟑𝟓 𝒔𝒆𝒄𝒐𝒏𝒅𝒔
𝑨𝒄𝒉𝒊𝒆𝒗𝒆𝒅𝟖 𝒄𝒉𝒂𝒓𝒂𝒄𝒕𝒆𝒓𝒔 𝒑𝒆𝒓 𝟐 𝒔𝒆𝒄𝒐𝒏𝒅𝒔
Size
Reliability
Refresh
Time
Refresh
Time
Cost
[5]
Knowledge is Power
Public schools could
afford to serve visually
impaired children's
needs
Children won’t be
limited by the
availability of special
educators
Students could access
the growing knowledge
of an online braille
community
Advisors and Sponsors
Dr. Kevin TurnerGabel Family Term
Associate Professor,
MEAM, MSE
Viji DilipMBA, CPA
CEO - Access Braille
Frank IrzykM.Ed., Tech
Coordinator -
Overbrook School
for the Blind
Suzanne ErbM.S., CESP,
Disability
Employment/
Braille Activist
References
K. Dots
[1] National Federation of the Blind, 'The Braille Literacy Crisis in America', 2009. [Online].
pg. 1. Available:
https://nfb.org/images/nfb/documents/pdf/braille_literacy_report_web.pdf. [Accessed: 16-
Sep- 2015].
[2] Afb.org, 'Refreshable Braille Displays - Browse by Category - American Foundation for the
Blind', 2015. [Online]. Available: https://www.afb.org/ProdBrowseCatResults.asp?CatID=43.
[Accessed: 28- Oct- 2015].
[3] Matheson, L. P. (2009). Current Developments in Refreshable Braille Display
Technology.Resna. Retrieved from
https://www.resna.org/sites/default/files/legacy/conference/proceedings/2009/Technolog
yCognitiveSensory/Matheson.html
[4] J. Lee and S. Lucyszyn, 'A Micromachined Refreshable Braille Cell', Journal of
Microelectromechanical Systems, vol. 14, no. 4, pp. 673-682, 2005.
[5] Chapter Five Read, Read, Read—There Is No Substitute. (n.d.). Retrieved from
https://nfb.org/images/nfb/publications/books/integrating-print-
braille/integratingprintandbraillechapter5.html