Wearable Motion Analyzer on μT-Kernel

TRON Contest 2025 Entry

Overview

This project is a wearable motion analyzer built on μT-Kernel 3.0.
It measures wrist motion with an accelerometer, records reference (MASTER) and comparison (MINIC) motions,
and provides real-time feedback via LED display and sound effects.

Features

• Runs on μT-Kernel 3.0 with small footprint, low power, and real-time performance
• Simple operation:
  • A button = record MASTER motion
  • B button = record MINIC motion & compare
• Immediate feedback with LED indicators (○ / ✗) and sound
• Designed for rehabilitation support, sports education, and motion analysis
• Future expansion: multi-node configuration, AI-assisted analysis (TinyML), Web/Cloud integration

Development History

• Based on mtkernel_3 (official reference implementation)
• TRONWARE sample codes were referenced for task, handler, and synchronization control
• Added original modules:
  • Motion recording & comparison
  • LED animation and sound effects
  • Data analysis (200-sample segmentation, Z-axis feature extraction)

Hardware Requirements

• micro:bit board
• Bangle module kit (SKU 8459)
• CR2032 battery (or alternative power source, e.g. AAA×2, LiPo)

Project Structure

This project is part of a multi-component system:

src/
├── WearableMotionAnalyzer-uTKernel/    # Main application (this project)
│   └── build_make/                     # Build directory
│       └── makefile                    # References lsm303agr-utkernel
├── lsm303agr-utkernel/                # Sensor calibration library
│   ├── lib/                            # Built library (liblsm303agr_calib.a)
│   └── include/                        # Library headers
└── wearable-motion-visualizer/         # Visualization tool (Node.js)
    └── server.js                       # WebSocket server for real-time display

Dependencies

• WearableMotionAnalyzer-uTKernel depends on lsm303agr-utkernel

  • The library is automatically built when building the main project
  • Library path: ../../lsm303agr-utkernel/
  • See lsm303agr-utkernel README for library details

• wearable-motion-visualizer is an independent tool for visualizing sensor data

  • Connects to MCU via serial port (UART)
  • See wearable-motion-visualizer README for usage

License

• Base code: licensed under the same terms as mtkernel_3
• Modifications & extensions: © 2025 Ryuji Mori

使用目的とクレジット

This project is a reference implementation primarily intended for research and educational purposes.

• Research and educational use: You are free to use, modify, and distribute under the Apache-2.0 License
• Commercial use: Commercial use is permitted, but we kindly request credit and a link
  • Example: "Based on Wearable Motion Analyzer by Ryuji Mori (https://github.com/mnrj-vv-w/WearableMotionAnalyzer-uTKernel)"

This project is an entry for TRON Contest 2025.