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Open AccessArticle

A Self-Powered Insole for Human Motion Recognition

by Yingzhou Han 1,2,3, Yalu Cao 1,2,3, Jingjing Zhao 1,2,3, Yajiang Yin 1,2,3, Liangchen Ye 1,2,3, Xiaofeng Wang 1,2,3,* and Zheng You 1,2,3,*
Collaborative Innovation Center for Micro/Nano Fabrication, Device and System, Tsinghua University, Beijing 100084, China
State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China
Department of Precision Instrument, Tsinghua University, Beijing 100084, China
Authors to whom correspondence should be addressed.
Academic Editors: Steffen Leonhardt and Daniel Teichmann
Sensors 2016, 16(9), 1502;
Received: 11 July 2016 / Revised: 20 August 2016 / Accepted: 9 September 2016 / Published: 15 September 2016
(This article belongs to the Special Issue Wearable Biomedical Sensors)
Biomechanical energy harvesting is a feasible solution for powering wearable sensors by directly driving electronics or acting as wearable self-powered sensors. A wearable insole that not only can harvest energy from foot pressure during walking but also can serve as a self-powered human motion recognition sensor is reported. The insole is designed as a sandwich structure consisting of two wavy silica gel film separated by a flexible piezoelectric foil stave, which has higher performance compared with conventional piezoelectric harvesters with cantilever structure. The energy harvesting insole is capable of driving some common electronics by scavenging energy from human walking. Moreover, it can be used to recognize human motion as the waveforms it generates change when people are in different locomotion modes. It is demonstrated that different types of human motion such as walking and running are clearly classified by the insole without any external power source. This work not only expands the applications of piezoelectric energy harvesters for wearable power supplies and self-powered sensors, but also provides possible approaches for wearable self-powered human motion monitoring that is of great importance in many fields such as rehabilitation and sports science. View Full-Text
Keywords: wearable sensors; motion recognition; self-powered insole; energy harvester wearable sensors; motion recognition; self-powered insole; energy harvester
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Han, Y.; Cao, Y.; Zhao, J.; Yin, Y.; Ye, L.; Wang, X.; You, Z. A Self-Powered Insole for Human Motion Recognition. Sensors 2016, 16, 1502.

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