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Published: January 4, 2026

X-TRACK Open Source GPS Bicycle Computer

An open-source GPS bicycle computer featuring offline maps, real-time track recording, and GPX export. It is built on the high-performance AT32F435 microcontroller and utilizes the LVGL V8 library for a sophisticated graphical interface, supported by custom page management and data distribution frameworks.

X-TRACK Open Source GPS Bicycle Computer

X-TRACK is a high-performance, open-source GPS bicycle computer designed to provide cyclists with professional-grade features in a DIY-friendly package. The project stands out by offering offline map capabilities and real-time trajectory tracking, features typically reserved for high-end commercial cycling computers.

Hardware Architecture

The system is powered by the Artery AT32F435CGU7 microcontroller, which boasts a high clock frequency of 288MHz, 512KB of RAM, and 1MB of ROM. This processing power is essential for handling the rendering of offline maps and managing real-time GPS data. The visual interface is delivered via a 1.54-inch ST7789 IPS display with a 240x240 resolution, achieving a smooth 60Hz refresh rate.

Key hardware components include:

  • GPS Module: ATGM336H supporting multiple constellations (BDS, GPS, GLONASS, GALILEO, QZSS, SBAS).
  • Sensors: LSM6DSM accelerometer for hardware step counting and LIS3MDL magnetometer for heading.
  • Storage: Micro SD card support (up to 32GB) for map tiles and track logs.
  • Power: 700mAh Li-ion battery with dedicated power management (LP5907 and MCP73831).

Software Framework

X-TRACK utilizes a modern software stack centered around LVGL V8 for its graphical user interface. To manage the complexity of a multi-page navigation system, the project introduces two custom frameworks:

  1. PageManager: A dedicated “Page Lifecycle Management” system that handles transitions, initialization, and resource cleanup for different UI screens.
  2. DataCenter: A “Message Subscription and Publishing Framework” that decouples data providers (like the GPS or sensors) from data consumers (the UI pages), ensuring a clean and maintainable codebase.

Key Features

Beyond basic speed and distance tracking, X-TRACK provides a comprehensive suite of cycling tools:

  • Offline Maps: Supports displaying real-time position on pre-loaded map tiles with zoom functionality.
  • Track Management: Records movement trajectories and exports them in the standard GPX format for use in external analysis tools like GPXSee.
  • Data Persistence: Automatically saves user data in JSON format upon power-down.
  • RTC Synchronization: Automatically calibrates the internal real-time clock using GPS time signals.
  • Simulation Support: Includes a PC-based simulator (Release x86) allowing developers to debug UI and logic without needing the physical hardware.

Development and Customization

The project is highly modular, with the enclosure designed for 3D printing (SLA/Light Curing). For developers, the inclusion of a Visual Studio-based simulator significantly lowers the barrier to entry for UI customization. The repository provides detailed documentation on troubleshooting and map downloading, supported by a community of contributors who have provided tools for image conversion and map tile generation.