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

Chenhui Liu, Changzhan Gu, Changzhi Li

Research output: Contribution to journalConference article

7 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
Article number7129750
Pages (from-to)20-22
Number of pages3
JournalIEEE Radio and Wireless Symposium, RWS
Volume2015-June
Issue numberJune
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

Keywords

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

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