SmartRep: A Wireless Fitness Coach for Bangle.js 1

SmartRep is a modular smartwatch application developed for the Bangle.js 1. It tracks strength exercises in real-time using motion data and provides immediate visual and haptic feedback. Designed for hands-free operation, SmartRep helps users focus on form and reps without needing a phone or screen interaction.

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🎯 Project Overview

This app was developed as part of an academic project at Universität Siegen. The goal was to build a lightweight, fully on-watch fitness tracker using the Bangle.js 1. It is capable of detecting and counting repetitions for multiple strength-based exercises using built-in accelerometer data and logic derived from lightweight machine learning models.

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💪 Supported Exercises

• Bench Press
• Bicep Curls
• Cable Rows
• Lateral Raise
• Push-Up
• Shoulder Press
• Triceps Pushdown
• Squats

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🚀 Features

• Clean green-and-black UI theme
• Scrollable exercise list (BTN1 & BTN3)
• Repetition target selection
• Circular animated progress display
• Vibration and screen flash after set completion
• Modular architecture for easy extension
• Works fully offline on Bangle.js 1

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🧠 How Rep Detection Works

1. Data Collection: Raw accelerometer data (X, Y, Z) was collected for each exercise.
2. ML Model Design: ML classifiers (Decision Tree, Random Forest, KNN) were tested on motion features.
3. Threshold Conversion: Models were converted into rule-based motion thresholds.
4. Real-Time Execution: The final rep detection logic is optimized to run live on the watch.

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📂 File Structure

SmartRep/
├── smartrep.app.js         # UI and navigation controller
├── logic/                  # Individual exercise detection files
│   ├── bench_press.js
│   ├── bicep_curls.js
│   ├── cable_rows.js
│   ├── lateral_raise.js
│   ├── pushup.js
│   ├── shoulder_press.js
│   ├── squats.js
│   └── triceps_pushdown.js
├── srlogo.png              # App logo (inspired by Omnitrix)
├── metadata.json           # App descriptor for Bangle.js App Loader

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📲 How to Install

1. Go to the Bangle.js App Loader.
2. Select "Upload App".
3. Upload the following:
   • smartrep.app.js
   • metadata.json
   • srlogo.png
   • The entire logic/ folder
4. Flash the app to your Bangle.js 1 watch.
5. Press BTN1 and BTN3 to scroll. BTN2 to select and start.

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👨‍💻 Authors

• Lakhan Singh
• Aakash Deshmukh
• Mohit Bishnoi

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Note: Built for academic use and personal fitness tracking.

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Note: SmartRep runs entirely on-watch. No Bluetooth, phone, or server is needed during exercise.