Concurrent Plantar Stress Sensing and Energy Harvesting Technique by
Piezoelectric Insole Device and Rectifying Circuitry for Gait Monitoring
in the Internet of Health Things
Abstract
Concurrent high force detection accuracy and extended battery lifetime
are expected for wearable gait monitoring systems. In this article, a
piezoelectric insole device and rectifying circuitry-based technique is
presented to achieve these two goals. Here, walking induced positive and
negative charges are separated for plantar stress detection and energy
harvesting respectively, realizing the two functions concurrently. The
high detection sensitivity of 55 mN and responsivity of 231 mV/N are
achieved, satisfying the need for diagnosing various diseases. 1.6 pJ is
stored during a walking event, extending the battery lifetime. The
developed technique enhances the development of gait monitoring in IoHT.