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Page 1: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

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

Page 2: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

10% of blind children are braille literate

50% of blind students don’t complete high school

70% of blind adults are unemployed

[1]

Page 3: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

Braille is a tool for Empowerment

Audiodoes not provide

an active

experience

Printedmaterials require

an instructor

Electronicrefreshable

displays cost

$2000-$10,000+

[2]

Page 4: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

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.

Page 5: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

Improving Access

Page 6: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

Improving Access

Page 7: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

Improving Access

Page 8: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

Improving Access

Page 9: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

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

Page 10: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

K.Dot’s Unique SolutionP

in

SledSledSled Pin

Pin

Pin

Pusher

Page 11: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

System Overview

Outer Dot

Interface

Pin Pusher

Assembly

Drive

System

Page 12: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

System Overview

Outer Dot

Interface

Pin Pusher

Assembly

Drive

System

Page 13: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

Outer Dot Interface

ConceptDisplay 48 binary-state braille dots

• 48 individual 3D-

printed pins

• Pin housing

• Universal “sled”

latching mechanism

Page 14: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

Barriersfor constraint

Outer Dot Interface

Concentric Alignment

Page 15: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

System Overview

Outer Dot

Interface

Pin Pusher

Assembly

Drive

System

Page 16: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

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

Page 17: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

Pin Pusher Assembly

Page 18: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

System Overview

Outer Dot

Interface

Pin Pusher

Assembly

Drive

System

Page 19: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

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

Page 20: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

Integration of Subsystems

Page 21: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

Evaluating the K.Dots Device

Size

Reliability

Cost

Refresh

Time

Page 22: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

Evaluating the K.Dots Device

Strict adherence to standards of the

National Federation for the Blind

[4]

Size

Reliability

Cost

Refresh

Time

Size

Page 23: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

Evaluating the K.Dots Device

Pushers within

tolerance for

79%of stops

Size

Reliability

Refresh

Time

Reliability

Cost

81% of pins

successfully

reset

Page 24: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

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

Page 25: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

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]

Page 26: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

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

Page 27: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

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

Page 28: MEAM Senior Design Final Presentation April 18th, 2016 | 9 ... · MEAM Senior Design Final Presentation April 18th, 2016 | 9:55 AM Houston Hall of Flags s Julia Hegarty | James Lovey

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