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Enabling a Cerebral Palsy Patient to Use a PC with a Foot-Operated Device
Anand JoshiFahad KhanSuzy Lopez
Michael PowellCarlos Vallin
Presented at Roswell Nursing Home andRehabilitation Center
April 28th, 2009
Project Overview
• Continuation of a previous group’s project
• Designed and implemented a system to allow a cerebral palsy patient to access software applications on a desktop computer
• Created a customized solution that is cost-effective and addresses the patient’s needs
• Sponsored by Kiwanis International
Design Features
The design includes the following features
• Non-invasive
• Robust and lightweight
• Comfortable and easy-to-use
• Cost-effective
• Easy to set up and maintain
• User-friendly
• Automatic startup software procedure
Problems With Previous System
• Head Tracking was inaccurate due to extraneous movements by the patient and lack of head control
• Difficult for patient to see screen when moving head for
tracking purposes
• Need for third party help to attach mouse to wheelchair
• Wireless mouse runs off of batteries that need to be
replaced periodically
• Wireless mouse was uncomfortable to patient
• Software interface non-intuitive
New System
• Nintendo Wiimote – Commercially available for easy replacement
• Foot Operated Device (FOD) - Scrolling
• Wiimote Nunchuk - Clicking
• Hardware/Software translator: GlovePIE
• New On-Screen Keyboard
– Text Editor
– Email Reader and Composer
– Web Browser
Pre-Experimentation Constraints
The following constraints were observed prior to the first phase of experimentation with the patient
• Wheelchair-bound• Motor skills• Speech• Living environment
Post-Experimentation Constraints
The following constraints were observed after the first phase of experimentation
• Fatigue with excessive use of the system
• Involuntary motion while operating the system
Project Goals
The system includes the following functionality to accommodate the aforementioned constraints
• Foot Operated Device and Wiimote mapped
patient’s foot movements to the on-screen
keyboard
• Thresholds established for maximum left and
right foot movements
• Horizontal on-screen keyboard with wrap around
function and enhanced key functionality
• Customized e-mail, browser and text application
Keyboard Navigation
The Wiimote tracks the following three foot movements:
• Center – Highlights the key• Right – Transforms the key to move right
Foot rotates to the right
and cursor scrolls to the right
Keyboard Navigation
The Wiimote tracks the following three foot movements:
• Center – Highlights the key• Right – Transforms the key to move right• Left – Transforms the key to move leftFoot
rotates to the left
and cursor scrolls to the left
Enhanced Keyboard Functionality
Main Menu Function gives access to the following applications:
•Text Editor
•Email Application (Read/Write)
•Web Browser
Text Editor
• Intuitive interface
• Scrollable
• Saves text to a .txt file
• Auto saves to avoid
losing data while
switching applications
Email Application (Reading Interface)
• “Get New” button
should be used for
downloading new
emails
• Reading Pane toggle
added for better patient
control
Email Application (Writing Interface)
• Easy to use and self
explanatory buttons such
as
“From”, “To”, “Subject”,
”Body”
• This eliminated repeated
toggling and resulted in
making the whole
processes faster and
more efficient.
Web Browser
• “Enter URL” button
should be used for
entering website
addresses
• ↑ is used for scrolling
up
• ↓ is used for scrolling
down
• → for scrolling across
the page
Scalability Measures
The design serves as a framework to develop further applications by taking advantage of the following
• Predictive text technology
• Develop software applications that take into
account the patient inputs
• Specialized gadgets
• Games(Patient prefers Bingo)
• Instant Messaging
Changes in Software
Proposed Features Additional Features
• Foot-controlled navigation
• Glove pie used as a translator
between HW/SW
• Text editor application
• Custom e-mail application
• Custom web browser
• Center cursor application
• Keyboard Wrap Around
Function
• Accelerated scrolling
• Text-to-speech
• Error-correction
• Stability control
• Configuration file
• Predictive text technology
Changes in Hardware
Device Proposed Final
Foot Operated Device
• LED cluster
• Reflective Tape
• IR LED used in conjunction with Wiimote
Clicking mechanism
• Mouse with 30’
range
• Attached to wheel chair
•One magnetic
sensor
• Nunchuk Wii device
• Attached to Desk not wheelchair
Cost of Parts and Equipment
The following costs include development expenses:
• Projected cost $2,000
• Actual cost $265
CPIO group made used “off the shelf” products to minimize cost and reduce replacement difficulty
Labor was provided by the CPIO Group from the Georgia Institute of Technology
Hardware Recommendations
The following improvements can be made to increase the accuracy of the input devices
• Mount the webcam on an adjustable stand
• Reduce the size of the mouse enclosure
• Obtain tighter finger glove and stronger magnet
• Identify additional methods of input
• Attach the armrest to a desk
• Design a wireless foot pedal
Software Recommendations
The following improvements can be made to make a more comprehensive user interface
• Automate software startup procedure
• Improve error-correction algorithms
• Enable user to navigate within text
• Enhance dictionary
• Extend web browser to handle all content
• Allow user to use horizontal and vertical motion
• Create easy-to-use configuration interface
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