team 6: stephen heussler and nolan skop freely adjustable and accessible keyboard and arrow pad for...
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Team 6: Stephen Heussler and Nolan Skop
Freely Adjustable and Accessible Keyboard and Arrow Pad for Client with Cerebral Palsy
Sponsored by the National Science Foundation
Outline
Introduction– Background– Problem– Solution– Previous work done by others
Project Description– Design– Materials
Budget Conclusion
Client Background
Sam from Hampton, CT 10 year old 5th grade student Wants to fit in with other students Athetoid Cerebral Palsy
– Non-verbal– Requires electric wheelchair– Typing is primary means of communication
Athetoid Quadriplegia
Permanent damage of cerebullum or basal ganglia
Affects all limbs– Involuntary Movements– Difficulty in Preciseness– Difficulty with speaking
and other motor functions
Problem with Standard Keyboard
Horizontal position– Affects positioning of client’s hands
Keys too small– Multiple keys hit at a time– Damage to the keys
Not portable Slows down speed and efficiency of typing Not Durable
Problem with Standard Mouse
Difficult to grab Requires fine movements of hands and
fingers Highly sensitive
Solution
New Keyboard Design– Allow Sam to type faster and with greater ease– Reduce stress on hands and fingers
Replace Mouse with Arrow Pad
Patent Research
FrogPadTM
- Sits horizontal to surface
- Small Keys - Multiple
characters per button- not user friendly
Project Design
New Keyboard– Vertical Position– Large Keys– Simplified Layout– High Wear
Resistance– Portable
1 2 3 4
Q
A
Z
65
EW IUYR
0987
T
LKJH
C
GF
X
DS
PO
.MN
.
BV
ESC BACK SPACEINSERTDELTABSHIFT LOCK
ENTER
SPACE
7.6 cm
38.1 cm
3.8 cm
6.4 cm
27.9 cm
55.9 cm
Project Design cont’d.
Rubber bottom for high coefficient of friction
Compressible Diagonal Member to absorb impact of powerful typing
38. 1 cm
2. 5 cm
3. 8 cm
34. 3 cm
17. 8 cm
Diagonal Member
Project Design cont’d.
Cherry MX Switches– High Durability– Lifetime: 1^109
Operations
Project Design cont’d.
Keyboard Control Board (PI Engineering)– 128 possible switches– Connects to CPU through
USB
Diagram provided by PI Engineering
Project Design cont’d.
LED Backlighting– Enhance aesthetic
appeal of keyboard– Help our client fit in
Illustration of LED TLVP4200
Project Design cont’d.
Arrow Pad– Cherry MX Switches– Attaches to Keyboard
Control Board
5.1 cm
1.3
cm 5.1
cm
17 cm
Materials
Keyboard– PVC– Cherry MX Switches– LEDs– Compression Spring– Misc. Electrical Components– Misc. Mechanical Components
Budget
Available budget is $750 provided by the National Science Foundation
Product Price Per Unit ($) # of Units Total
keyboard controller 59.95 1 59.95
PVC (1/8” x 24” x 48” white pvc sheet) 30.27 3 90.81
LEDs 0.299 40 11.96
30 pin receptacle 1.99 1 1.99
diodes (pack of 50) 5 2 10
key caps (set of 10) 4.5 6 27
cherry mx switches (10pack) 9.95 6 59.7
Estimated shipping costs. 30
Miscellaneous < 75
TOTAL 350 ± 50
Conclusion
Accesible Keyboard and Arrow Pad– Faster, easier means of communication– Less strain on clients arms– Portable for classroom transport– High wear resistance - long lasting– LED backlighting– Custom built within budget
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