Tacsac: wearable haptic device with capacitive touch-sensing capability for tactile display

Ozioko, O., Navaraj, W., Hersh, M. and Dahiya, R. (2020) Tacsac: wearable haptic device with capacitive touch-sensing capability for tactile display. Sensors, 20(17), 4780. (doi: 10.3390/s20174780)

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This paper presents a dual-function wearable device (Tacsac) with capacitive tactile sensing and integrated tactile feedback capability to enable communication among deafblind people. Tacsac has a skin contactor which enhances localized vibrotactile stimulation of the skin as a means of feedback to the user. It comprises two main modules—the touch-sensing module and the vibrotactile module; both stacked and integrated as a single device. The vibrotactile module is an electromagnetic actuator that employs a flexible coil and a permanent magnet assembled in soft poly (dimethylsiloxane) (PDMS), while the touch-sensing module is a planar capacitive metal-insulator-metal (MIM) structure. The flexible coil was fabricated on a 50 µm polyimide (PI) sheet using Lithographie Galvanoformung Abformung (LIGA) micromoulding technique. The Tacsac device has been tested for independent sensing and actuation as well as dual sensing-actuation mode. The measured vibration profiles of the actuator showed a synchronous response to external stimulus for a wide range of frequencies (10 Hz to 200 Hz) within the perceivable tactile frequency thresholds of the human hand. The resonance vibration frequency of the actuator is in the range of 60–70 Hz with an observed maximum off-plane displacement of 0.377 mm at coil current of 180 mA. The capacitive touch-sensitive layer was able to respond to touch with minimal noise both when actuator vibration is ON and OFF. A mobile application was also developed to demonstrate the application of Tacsac for communication between deafblind person wearing the device and a mobile phone user who is not deafblind. This advances existing tactile displays by providing efficient two-way communication through the use of a single device for both localized haptic feedback and touch-sensing.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Dahiya, Professor Ravinder and Hersh, Dr Marion and Ozioko, Mr Oliver and Navaraj, Mr William
Creator Roles:
Ozioko, O.Conceptualization, Methodology, Software, Formal analysis, Writing – original draft, Writing – review and editing
Hersh, M.Formal analysis, Resources, Writing – review and editing, Funding acquisition
Dahiya, R.Conceptualization, Methodology, Formal analysis, Resources, Writing – review and editing, Supervision, Funding acquisition
Authors: Ozioko, O., Navaraj, W., Hersh, M., and Dahiya, R.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Sensors
ISSN (Online):1424-8220
Published Online:24 August 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Sensors 20(17): 4780
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
301728Engineering Fellowships for Growth: Printed Tactile SKINRavinder DahiyaEngineering and Physical Sciences Research Council (EPSRC)EP/R029644/1ENG - Electronics & Nanoscale Engineering
304237Predictive Haptic COding Devices In Next Generation interfacesRavinder DahiyaEuropean Commission (EC)829186ENG - Electronics & Nanoscale Engineering