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Embedded capacitive proximity and touch sensing flexible circuit system for electronic textile and wearable systems

Embedded capacitive proximity and touch sensing flexible circuit system for electronic textile and wearable systems
Embedded capacitive proximity and touch sensing flexible circuit system for electronic textile and wearable systems
Electronic textiles (e-textiles) are an emerging technology comprised of electronic circuit systems embedded into the fabric using traditional textile techniques such as knitting and weaving. Such systems can be formed using off-the-shelf passive components and integrated circuits (ICs) available commercially. An e-textile switching mechanism can be provided by proximity and touch sensing input behavior from a human hand to switch circuits, for example, turning on an LED for visual verification of successful switching. Challenges to be overcome to achieve reliable systems include optimised circuit sampling rate, detection sensitivity, and sensing electrode dimensions when operating among textile fibres. This paper presents development of a proximity and touch sensing e-textile flexible circuit system using a commercial capacitive detection chip PCF8883US by NXP Semiconductor. Experiments determine the necessary sensitivity and sampling rate values for this chip to detect through fabric for its optimum capacitance performance value of 20 pF. This paper further details the fabrication of this 150 μm track width, 3.0 mm × 35.0 mm × 0.043 mm dimension flexible, copper-polyimide capacitive sensing circuit and its integration into two e-textile systems – a knitted textile yarn and woven textile fabric. Experiments revealed that when an electrode is strip-shaped for e-textile applications, its width is more influential than electrode length in enabling capacitive dual-functionality proximity and touch sensing. A square-shaped electrode offers a 58.3 % increase in nominal proximity detection distance compared to multiple electrodes arranged in the same area.
1530-437X
1-11
Ojuroye, Olivia, Olamide
64591246-b373-4bad-83d7-8db7d7195209
Torah, Russel
7147b47b-db01-4124-95dc-90d6a9842688
Komolafe, Abiodun
5e79fbab-38be-4a64-94d5-867a94690932
Beeby, Stephen
ba565001-2812-4300-89f1-fe5a437ecb0d
Ojuroye, Olivia, Olamide
64591246-b373-4bad-83d7-8db7d7195209
Torah, Russel
7147b47b-db01-4124-95dc-90d6a9842688
Komolafe, Abiodun
5e79fbab-38be-4a64-94d5-867a94690932
Beeby, Stephen
ba565001-2812-4300-89f1-fe5a437ecb0d

Ojuroye, Olivia, Olamide, Torah, Russel, Komolafe, Abiodun and Beeby, Stephen (2019) Embedded capacitive proximity and touch sensing flexible circuit system for electronic textile and wearable systems. IEEE Sensors Journal, 1-11. (doi:10.1109/JSEN.2019.2911561).

Record type: Article

Abstract

Electronic textiles (e-textiles) are an emerging technology comprised of electronic circuit systems embedded into the fabric using traditional textile techniques such as knitting and weaving. Such systems can be formed using off-the-shelf passive components and integrated circuits (ICs) available commercially. An e-textile switching mechanism can be provided by proximity and touch sensing input behavior from a human hand to switch circuits, for example, turning on an LED for visual verification of successful switching. Challenges to be overcome to achieve reliable systems include optimised circuit sampling rate, detection sensitivity, and sensing electrode dimensions when operating among textile fibres. This paper presents development of a proximity and touch sensing e-textile flexible circuit system using a commercial capacitive detection chip PCF8883US by NXP Semiconductor. Experiments determine the necessary sensitivity and sampling rate values for this chip to detect through fabric for its optimum capacitance performance value of 20 pF. This paper further details the fabrication of this 150 μm track width, 3.0 mm × 35.0 mm × 0.043 mm dimension flexible, copper-polyimide capacitive sensing circuit and its integration into two e-textile systems – a knitted textile yarn and woven textile fabric. Experiments revealed that when an electrode is strip-shaped for e-textile applications, its width is more influential than electrode length in enabling capacitive dual-functionality proximity and touch sensing. A square-shaped electrode offers a 58.3 % increase in nominal proximity detection distance compared to multiple electrodes arranged in the same area.

Text
JSEN2911561 published in IEEE Sensor - Proof
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e-pub ahead of print date: 16 April 2019

Identifiers

Local EPrints ID: 432195
URI: http://eprints.soton.ac.uk/id/eprint/432195
ISSN: 1530-437X
PURE UUID: 099b5c5a-7746-44d6-af12-4435041c8320
ORCID for Russel Torah: ORCID iD orcid.org/0000-0002-5598-2860
ORCID for Stephen Beeby: ORCID iD orcid.org/0000-0002-0800-1759

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Date deposited: 03 Jul 2019 16:30
Last modified: 18 Feb 2021 17:03

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Contributors

Author: Olivia, Olamide Ojuroye
Author: Russel Torah ORCID iD
Author: Abiodun Komolafe
Author: Stephen Beeby ORCID iD

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