Non-contact hand interaction with smart phones using the wireless power transfer features

Chenhui Liu, Changzhan Gu, Changzhi Li

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

10 Scopus citations

Abstract

The interaction between human and smart phones is mainly based on press buttons and touch screens. As wireless charging based on wireless power transfer (WPT) coils is standardized and becoming a competitive feature for smart phones in recent years, it is also possible to control smart phones without contact by interacting with their wireless charging coils. In this paper, a non-contact method to interact with smart phones based on their wireless charging coils is proposed and investigated. A Colpitts oscillator is built and tested using a standard WPT coil as part of the resonant tank elements. Experiment results show that the resonant frequency of the coil is heavily influenced by hand movement, which could be further interpreted as the interaction between human and smart phones. By analyzing the resonant frequency changes of multiple coils embedded into a phone, it is possible to determine which hand movement is performed by a user.

Original languageEnglish
Title of host publicationRWS 2015 - Proceedings
Subtitle of host publication2015 IEEE Radio and Wireless Symposium, RWW 2015
PublisherIEEE Computer Society
Pages20-22
Number of pages3
EditionJune
ISBN (Electronic)9781479955053
DOIs
StatePublished - Jun 19 2015
Event2015 IEEE Radio and Wireless Symposium, RWS 2015 - RWW 2015 - San Diego, United States
Duration: Jan 25 2015Jan 28 2015

Publication series

NameIEEE Radio and Wireless Symposium, RWS
NumberJune
Volume2015-June
ISSN (Print)2164-2958
ISSN (Electronic)2164-2974

Conference

Conference2015 IEEE Radio and Wireless Symposium, RWS 2015 - RWW 2015
Country/TerritoryUnited States
CitySan Diego
Period01/25/1501/28/15

Keywords

  • Colpitts oscillator
  • non-contact smart phone interaction
  • spectrogram
  • wireless charging

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