Upload
constance-briggs
View
216
Download
0
Tags:
Embed Size (px)
Citation preview
Wheelchair Warning SystemTeam Members
Farshad Fahimi - Jimmy Fong - Tyler Witt - Yik Ning Wong
Client Advisor
Sandra R. Professor John Webster
Vascular Clinic Dept. of Biomedical Engineering
University of Wisconsin-Madison
University of Wisconsin-Madison
AbstractStructures that are handicap accessible are a primary concern of the disabled since they make everyday life less problematic. Our point of concern deals not with inanimate objects, but rather with the maneuvering through masses of pedestrians. Several accidents can occur and further injury may be the consequence. A device must be designed that will cause others to be made aware of their surroundings by seizing their attention. In order to aid this procedure, suggestions have been made to create a mechanism that can be controlled and used by the disabled person, regardless of his or her physical capabilities.
Problem StatementBackground: Our client’s daughter, Jessica, suffers from cerebral palsy and is unable to vocally identify herself. Her mother, Sandra, assists her daughter around on a daily basis and has requested that we develop an audible warning system to inform others of her daughter’s presence.
Motivation: During daily activities, our client and her daughter run into pedestrians. Due to the lack of a warning system, there is no efficient method of alerting the other people. Whether it is around a corner or on a ramp, others must be warned so that further accidents can be prevented.
Background Cerebral Palsy (CP)
Spastic: most common form of CP; characterized by stiff, jerky movements
Ataxic: associated with balance problems, shaky hand movements, and irregular speech
Athetoid: unwanted movements; loss of posture
Current Warning Method – Verbal Ineffective in large crowds Speech impairment
Design CriteriaAudible warning system to alert oncoming pedestrians
Intuitive design that can be activated by both Jessica and her mother
Must be mounted on right arm of wheelchair
Device must not add considerable bulk or affect everyday operation of wheelchair
Previous Designs
Elizabethtown CollegeProximity sensors used to detect stationary objectsOver-activation of sensors in crowded areas
PatentsPatents have been issued describing devices emitting an audible tone for wheelchair users in distress U.S. Patent # 5,791,761
Final Design:Two-way SwitchesTwo consoles - Arm rest and handleSeparate switches for each functionBoth functions powered by 9V battery4 Single Pole-Double Throw Rocker SwitchesPower Center beneath wheelchair containing circuitry and buzzer
Two-way Switches: CircuitryLights
One red and one blue LED mounted on each side
BuzzerContained in power center emitting a siren-like noise Schematic for circuit
design at a console
Buzzer
Lights
Two-way Switches: Materials
SwitchesUser consoles contain switches
White = LightBlack = Sound
HousingBlack plastic boxes provide protection against debrisDoes not interfere with daily use of wheelchair
Visual Layout
Clamps to wheelchair handle
Light Switch
Contains circuitry 9V power source
Top view
Side view
Front view
Cost AnalysisProduct Quantity Cost
Plastic Housing 5 $18.00
LEDs 4 $16.38
Piezo Buzzer 1 $5.29
Rocker Switches 4 $5.76
Circuitry 1 $3.00
Total $48.43
Future WorkStable attachment onto frameConceal wires and make more aesthetically pleasingClient must test product to determine if lights are bright enough and grasp attention of others
ConclusionThanks
Our advisor, Dr. WebsterOur clients, Sandra, Jessica, and Bob.
ReferencesBicycle Lights. Tireflys. Date Accessed: 14 Sept 2005 http://www.tireflys.com.Küschall Mobility. Küschall. Date Accessed: 25 Sept 2005. http://www.kuschallna.com/.Proximity Sensors. Date Accessed: 11 Oct 2005. http://www.parkingsensors.co.uk. US Patent Database. Date Accessed: 12 Oct 2005. http://www.uspto.gov/patft/.Wheelchair Picture. Butler Disabilities. Date Accessed: 11 Oct 2005. http://www.butler.edu/disabilities.RadioShack. Date Accessed: 22 Nov 2005. http://www.radioshack.com.
WHEELWHEEL
CHAIR CHAIR
WARNIWARNI
NG NG
SYSTE SYSTE
M M