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Wheelchair Warning System
Client AdvisorSandra Rodriguez Prof. John Webster
Team MembersFarshad Fahimi
Jimmy Fong
Tyler Witt
Yik Ning Wong
OverviewProblem StatementBackground InformationSummary of Product Design Specs.Design AlternativesFuture Work
Problem StatementOur client’s daughter, Jessica, suffers from cerebral palsy and is unable to vocally identify herself. Her mother, Sandra Rodriguez, 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.
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
PDS SummaryClient Requirements
Audible 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 DesignsElizabethtown College
Proximity 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
Design 1: Dual Control Panels
Two consoles - Arm rest and handleSeparate switches for each functionSingle circuit, single power supply
SOUNDLIGHT LIGHTS & SOUND
Schematic for single console
Design 1: Dual Control Panels
AdvantagesVersatilityCost effective User controlled
Disadvantages Diodes neededCumbersome consoles
Design 2: Infrared Sensor
Infrared SensorDetect proximityLights and sound activateModified parking sensor design
Design 2: Infrared SensorAdvantages
Detect inanimate objectsAdjustable range with warning zonesAutomated
Disadvantages CostlyUnreliableNo user activation
Warning zones
Design 3: Two-way Switches
Two consoles - Arm rest and handleSeparate switches for each functionDouble circuit and double power supply
Design 3: Two-way Switches
AdvantagesCost effectiveEasy to operateCircuit malfunctions easily found
DisadvantagesMore batteries are needed Schematic for circuit
design at a console
Light
Buzzer
Design Matrix
Dual Control Panels
I nf rared Two-way Switches
Ease 6 10 8
Cost 6 2 7
Saf ety 5 8 8
Reliability 4 3 9
Eff ectiveness 8 3 8
Total 29 26 40
Final Design : Two-way Switches
Clamps to wheelchair handle
Light Switch
Contains circuitry 9V power source
Palm contour
Top view
Side view
Front view
Future WorkFurther circuit research and development
Analyze wheelchair
Examine product in use
ConclusionReferences
Bicycle 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.
Thank you for your timeThank you for your time
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