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SmartStep: A Fully Integrated, Low-Power Insole Monitor.

Nagaraj Hegde1, Edward Sazonov1

  • 1Department of Electrical and Computer Engineering, the University of Alabama, 342 HM Comer, Tuscaloosa, AL 35487, USA.

Electronics
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Summary
This summary is machine-generated.

This study introduces SmartStep, an insole-based wearable sensor for activity monitoring. It offers reliable data collection for over two days, overcoming the need for shoe modification.

Keywords:
AndroidBluetooth low energyflash memory managementlow-power systemssensors

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Area of Science:

  • Biomedical Engineering
  • Wearable Technology
  • Sensor Systems

Background:

  • Shoe-mounted wearable sensors are valuable for activity monitoring, gait analysis, and rehabilitation.
  • Existing sensors often require shoe modification, limiting widespread adoption.
  • A need exists for unobtrusive, versatile wearable sensors compatible with various footwear.

Purpose of the Study:

  • To develop and evaluate SmartStep, an insole-based wearable sensor system.
  • To address the limitations of shoe-mounted sensors by eliminating the need for shoe alteration.
  • To demonstrate the feasibility of a low-power, reliable insole sensor for continuous monitoring.

Main Methods:

  • Integration of a 3D accelerometer, 3D gyroscope, and pressure sensors into a generic insole.
  • Utilizing a CC2540 system-on-chip with an 8051 processor, Bluetooth low energy (BLE), and flash memory.
  • Development of low-power strategies and a robust data buffering method for intermittent connectivity.
  • Wireless interfacing with an Android smartphone application for data logging and visualization.

Main Results:

  • SmartStep demonstrated a power consumption allowing for over two days of continuous wear between recharges.
  • Mechanical reliability tests confirmed the durability of pressure sensors under prolonged human use.
  • The system achieved over 98.5% data collection accuracy in real-world scenarios with intermittent connectivity.

Conclusions:

  • SmartStep provides a practical, non-invasive solution for wearable sensing in diverse footwear.
  • The system offers a reliable and low-power platform for various applications, including activity monitoring and rehabilitation.
  • SmartStep's design effectively manages data buffering and low-power requirements for extended use.