🏆 The most innovative open-source bike computer that outperforms commercial alternatives

"GPS navigators were inaccurate, expensive ones were basic... so I decided to create my own"

This isn't just another Arduino project—it's a revolution in affordable cycling technology. While Garmin charges $300+ for basic functionality, this project delivers professional-grade bike computer features for under $20.

Born from frustration with expensive, limited bike computers, this project proves that innovation beats corporation. Using a simple Hall sensor and magnet, we've created a system that's more accurate than GPS and more feature-rich than most commercial alternatives.

Real bike computer in action - smooth, professional, and completely DIY

• Instant Speed: Precise velocity measurement (m/s or km/h)
• Smart Distance Tracking: Cumulative and session distance
• Acceleration Monitoring: Real-time acceleration with max detection
• Intelligent Averaging: Separate averages for total and moving time

• Live Velocity Graphs: 1, 3, 5, and 15-minute real-time plots
• Historical Data: EEPROM persistence across power cycles
• 8 Display Modes: Comprehensive data at your fingertips
• Smart Display Management: Auto-brightness and sleep modes

• Ultra-Low Power: Powered by any USB power bank
• Intelligent Sleep: Automatic display management
• Instant Wake: Motion-activated display
• Debounced Sensors: Rock-solid reliability in real conditions

• Hall Sensor Accuracy: More precise than GPS for speed/distance
• Configurable Calibration: Perfect for any wheel size
• Noise Filtering: Advanced algorithms prevent false readings
• Professional UI: Clean, readable display even in sunlight

Professional wiring diagram - enterprise-level engineering made simple

• Arduino Uno/Nano: $5
• Hall Sensor KY-035: $2
• LCD 16x2 I2C: $4
• Push Button: $1
• Neodymium Magnet: $2
• Power Bank: $6

1. Clone the repository:

   git clone https://github.com/astrosander/arduino-speedometer.git
   cd arduino-speedometer

2. Install required libraries:

   • LiquidCrystal_I2C
   • EncButton
   • GyverTimer

3. Upload firmware:

   • Open firmware/Speedometr/Speedometr.ino in Arduino IDE
   • Configure your wheel circumference in len variable
   • Upload to your Arduino

4. Wire according to the diagram and mount on your bike!

• Arduino + Power Bank: Secure to bike frame
• Hall Sensor: Mount on fork with hot glue
• Magnet: Attach to spoke
• LCD Display: Mount on handlebars for perfect visibility

1. Main Dashboard: Speed + Distance + Time
2. Live Velocity Graph: Real-time speed visualization
3. Performance Stats: Max speed + Max acceleration
4. Averages: Overall and moving averages
5. Time Tracking: Session and total time
6. 1-Minute Graph: Short-term velocity trends
7. 3-Minute Graph: Medium-term analysis
8. 15-Minute Graph: Long-term performance tracking

• Noise Filtering: Prevents false triggers from vibration
• Acceleration Limits: Filters impossible readings (unless you're an astronaut! 🚀)
• Smart Averaging: Distinguishes between moving and stopped time
• Memory Management: Efficient EEPROM usage for data persistence

Real installations on actual bikes - weatherproof and road-tested

✅ Tested in real cycling conditions
✅ Weatherproof installation
✅ Vibration resistant
✅ Long-term reliability proven

• Democratizes Technology: High-end bike computer features for everyone
• Educational Value: Perfect Arduino project for learning embedded systems
• Customizable: Full source code means infinite possibilities
• Community Driven: Your contributions make it better for everyone

We welcome contributions! Whether it's:

• 🐛 Bug fixes
• ✨ New features
• 📚 Documentation improvements
• 🧪 Testing on different hardware
• 🎨 UI enhancements

This project is perfect for:

• 🎯 Arduino beginners: Well-commented, modular code
• 🔧 Hardware enthusiasts: Real-world sensor integration
• 📊 Data scientists: Algorithm development and optimization
• 🚴‍♂️ Cyclists: Understanding the tech behind bike computers
• 👨‍🎓 Students: Practical embedded systems project

This project is MIT Licensed - completely free to use, modify, and distribute.

Build it, hack it, improve it, sell it - just keep it open source! 💖

If this project saved you hundreds of dollars and inspired your next build:

⭐ Star this repository to help others discover it
🍴 Fork it and make it your own
📢 Share it with your cycling and maker communities
🐛 Report issues to help improve it
💡 Suggest features for future versions

🚴‍♂️ Happy Cycling! 🚴‍♀️
Made with 💖 by astrosander

"Innovation doesn't require a corporation - just passion and creativity"

⚡ Ready to build your own? The future of affordable bike computers starts here! ⚡