F*watch – a fully open electronic watch

Project description

F*watch is a fully open electronic watch project featuring an integrated GPS receiver.
The development started at CERN as an after-work project to make a special present for a retiring colleague who likes hiking and timing.
The full design (electronics, mechanics and software) is available under free licenses and the design is exclusively made with free tools.

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a fully open electronic watch



  • Sensors
    • GPS
    • Pressure sensor
    • 3D-accelerometer
    • Compass
    • Ambient light sensor
  • I/O
    • 128×128 pixels LCD with backlight
    • Micro-USB connector, 4 Buttons
    • Buzzer, vibrating motor
    • MicroSD memory slot
  • Various
    • 500 mAh Lithium-ion battery, fuel gauge
    • 4-layer PCB
  • Developed with open KiCad design tool for schematics and PCB
  • Block diagram


  • 3D-printed watch case and buttons
  • Developed with open FreeCAD design tool


  • FreeRTOS operating system
  • Bootloader, drivers, applications
  • Interface to USB host (e.g. download track data, upload firmware)
  • Developed with open gcc compiler


For more detail: F*watch – a fully open electronic watch

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