Next Article in Journal
Manipulation of Biological Cells Using a Robot-Aided Optical Tweezers System
Next Article in Special Issue
A Micromachined Coupled-Cantilever for Piezoelectric Energy Harvesters
Previous Article in Journal
Nanostructure-Enabled and Macromolecule-Grafted Surfaces for Biomedical Applications
Previous Article in Special Issue
Gimbal-Less Two-Axis Electromagnetic Microscanner with Twist Mechanism
Article Menu
Issue 5 (May) cover image

Export Article

Open AccessArticle
Micromachines 2018, 9(5), 244;

Energy Harvesting Combat Boot for Satellite Positioning

Massachusetts Institute of Technology, 77 Massachusetts Ave., 1-306, Cambridge, MA 02139, USA
Singapore University of Technology and Design, 8 Somapah Rd., Singapore 487372, Singapore
Author to whom correspondence should be addressed.
Received: 3 April 2018 / Revised: 7 May 2018 / Accepted: 11 May 2018 / Published: 17 May 2018
(This article belongs to the Special Issue Microsystems for Power, Energy, and Actuation)
Full-Text   |   PDF [1642 KB, uploaded 17 May 2018]   |  


Most portable electronic devices are power-limited by battery capacity, and recharging these batteries often interrupts the user’s experience with the device. The product presented in this paper provides an alternative to powering portables by converting regular human walking motion to electricity. The device harvests electric power using air bulbs, distributed in the sole of a shoe to drive a series of micro-turbines connected to small DC motors. The number and position of air bulbs is optimized to harvest the maximum airflow from each foot-strike. The system is designed to continuously drive the micro-turbines by utilizing both outflow and inflow from the air bulbs. A prototype combat boot was fitted on the right foot of a 75 kg test subject, and produced an average continuous power on the order of 10 s of mW over a 22 Ω load during walking at 3.0 mph. This combat boot provides enough electric power to a passive GPS tracker that periodically relays geographical coordinates to a smartphone via satellite without battery replacement. View Full-Text
Keywords: energy harvesting; GPS-equipped footwear; micro turbines; foot-step driven airflow energy harvesting; GPS-equipped footwear; micro turbines; foot-step driven airflow

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Akay, H.; Xu, R.; Han, D.C.X.; Teo, T.H.; Kim, S.-G. Energy Harvesting Combat Boot for Satellite Positioning. Micromachines 2018, 9, 244.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Micromachines EISSN 2072-666X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top