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A gyro sensor based computer mouse with a USB interface: A technical aid for motor-disabled people
Mälardalen University, School of Innovation, Design and Engineering. (IS (Biomedical engineering))
Office for Science and Technology, Uppsala University, Uppsala, Sweden. (Biomedical engineering)
Mälardalen University, School of Innovation, Design and Engineering. (IS (Biomedical engineering))ORCID iD: 0000-0003-1940-1747
2012 (English)In: Technology and disability, ISSN 1055-4181, Vol. 24, no 2, 117-127 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to develop an alternative computer mouse for disabled persons. The mouse developed is a flexible input device with a multi-click function, which can be attached to a selectable body part (eg head, arm, foot). The mouse has a MEMS-gyroscope as the motion sensor, which is both small and sensitive. A USB-interface with a HID-profile is used to make the installation easy, "plug & play", and to make it compatible for use on any modern computer, independent of the operating system (Windows, Linux, Mac etc.). The structure is modular to achieve a flexible functionality. The mouse has individually adapted click-functions with selectable click devices, in addition to which, it is possible to define individual settings of the mouse parameters. The functionality can be extended by adding further personal settings, thereby programming the mouse for individual optimal performance. The result is a reliable and useful computer mouse for people with disabilities. In the development process, 23 users have been interviewed, three of whom participated in a 6 month long-term test. The study shows that a computer mouse incorporating a MEMS-gyroscope is a good, flexible solution, providing a high performance technical aid with extremely good sensitivity at a modest cost.

Place, publisher, year, edition, pages
IOS Press, 2012. Vol. 24, no 2, 117-127 p.
Keyword [en]
Assistive technology, computer mouse, input device, MEMS-gyroscope, human-computer interface, motor disabled, motor impairment
National Category
Control Engineering Engineering and Technology
Research subject
Electronics; Electronics
Identifiers
URN: urn:nbn:se:mdh:diva-12298DOI: 10.3233/TAD-2012-0340Scopus ID: 2-s2.0-84862555254OAI: oai:DiVA.org:mdh-12298DiVA: diva2:418328
Projects
NovaMedTech
Available from: 2011-05-22 Created: 2011-05-22 Last updated: 2016-01-11Bibliographically approved
In thesis
1. Avancerade alternativa inmatningsenheter till datorer för funktionshindrade
Open this publication in new window or tab >>Avancerade alternativa inmatningsenheter till datorer för funktionshindrade
2011 (Swedish)Licentiate thesis, comprehensive summary (Other academic)
Abstract [sv]

Datorn är ett viktigt verktyg i vår vardag. För rörelsehindrade kan datorn vara en förutsättning för att kunna fungera i vardagen. Datorn har som tekniskt hjälpmedel gett funktionshindrade större möjligheter till meningsfulla aktiviteter, såsom att på egen hand skriva, läsa och kommunicera. Samtidigt är det inte alltid funktionshindrade klarar av att använda vanliga datorer utan behöver alternativa inmatnings- och styrenheter.

Målet med denna licentiatavhandling har varit att utveckla tekniker som ska stödja personer med rörelsebegränsningar. Främst har arbetet varit att utveckla alternativa tekniker för att kunna manövrera en dator. Viktiga aspekter i arbetet har varit att göra hjälpmedlen användarvänliga, möjliga att individanpassa, och att ta tillvara de tänkta användarnas synpunkter kring behov och önskemål. Vidare har inmatningsenheten utvärderats av användare och även tillämpats som ett rehabiliteringsverktyg för en mindre patientgrupp med nackskador, så kallade pisksnärtskador.

Utöver dessa vetenskapliga mål har produktionsaspekterna varit viktiga. För att säkerställa att enheten ska kunna bli en produkt måste den kunna produceras och säljas till ett rimligt pris och detta måste beaktas under hela utvecklingsprocessen.

En alternativ datormus baserad på MEMS-gyroskop har utvecklats. Utvecklingen är gjord utifrån de krav de tilltänka användarna ställde på den alternativa datormusen och enheten är utprovad och förbättrad i en iterativ process mellan utvecklare och användare, så kallad användarcentrerad utvecklingsprocess. MEMS-gyron var den typ av rörelsesensor som bäst svarade mot de krav som ställdes på enheten. De användare som deltog vid ett längre fältprov var samtliga nöjda och ville behålla musen.

För att underlätta processen att välja rätt typ av gyro och att kunna utvärdera deras stabilitet under olika omgivningsfaktorer, såsom temperatur och vibrationer, har en testrig för gyron utvecklats. Människors rörelsemönster skiljer sig från industriella tillämpningar och därför behövs en speciell testrigg. Testriggen roterar gyron och mäter sensorsignalen under olika betingelser. Flera gyron kan testas samtidigt och testdatat kan sparas och analyseras i efterhand.

Ett interaktivt datorbaserat träningsprogram har utvecklats och utvärderats vid en pilotstudie tillsammans med den alternativa datormusen. Syftet var att låta nackskadade utföra huvudrörelser och få en feedback på att de tränar rätt. Resultatet pekar på att detta kan vara en lovande metod.

Abstract [en]

Computers are important tools. People with motion disabilities sometimes are dependent on a computer and used as a technical aid the computer has improved the possibilities to perform meaningfull tasks, as writing, reading and communicating. However, disabled often need an alternative input device to control a computer.

 

The aim with this licentiate theses has been to develope techniques to support persons with motion limitations. Focus has been to develope alternative techniqes to control a computer. Important aspects have been user-friendlieness, possiblilities to perform individual adaptions and incorporatation of specifications from the intended users. Further, the input device has been evaluated by users and applied as a rehabilitation tool for a smaller patient group of persons with whiplash associated disorders.

 

Further, production aspects are important. To make the unit into a product, it has to be possible to produce and sell to a reasonable price. This has to be considered during the whole development process.

 

An alternative computer mouse based on a MEMS gyroscope has been developed. The specifications made by the users has been used as a starting point in the development and the unit has been evaluated and improved in an iterative process, so called user centric development. MEMS-gyros were the type of motion sensors most corresponding to the demands. The users that participated in a longer field test were all satisfied and wanted to keep the mouse.

 

To improve the process to choose right kind of gyro and to be able to evaluate their stability depending on factors as temperature and vibration, a test-rigg for gyros has been developed. Human motion pattern differs from industrial applications and therefor a special test-rigg was needed. The testrigg rotates the gyros and measures the sensor signal. Several gyros can be tested simultaneously and data can be stored and analysed afterwards.

 

An interactive computerbased training program has been developed and evaluated in a pilot study together with the altrenative computer mouse. The aim has been to let people with neck injuries perform head motions and get feedback that they perform the right kind of training. The result is promising.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2011
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 133
Keyword
inmatningsenheter, funktionshindrade, datormus, MEMS-gyro
National Category
Biomedical Laboratory Science/Technology
Research subject
Electronics
Identifiers
urn:nbn:se:mdh:diva-12286 (URN)978-91-7485-020-8 (ISBN)
Presentation
2011-06-09, Delta, R-huset, Högskoleplan 1, Västerås, 13:15 (Swedish)
Opponent
Supervisors
Available from: 2011-05-23 Created: 2011-05-21 Last updated: 2011-06-07Bibliographically approved

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