PPS Watch

The Most Accurate Watch that Doesn't Tell Time

Sean Hodgins

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Description
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Files 3
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Components 19
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Description

The PPS Watch is a battery powered wrist-mounted GPS timing reference that outputs a precise one-pulse-per-second signal through BNC. It accepts an external PPS input, compares it to the GPS PPS, and shows the result with LEDs. It does not tell time, but two of them can stay synchronized anywhere in the world with a clear view of the sky.

This was made as a project for Jeff Geerling when he came to visit my bunker.

Details

Check out the build video!

Files

watch_band_mount.stl 3D Print File for the watch band holder Standard Tesselated Geometry - 626.81 kB - 07/05/2026 at 15:12		Download
pcb_frame_mount.stl 3D Print file for the PCB Holder Standard Tesselated Geometry - 432.69 kB - 07/05/2026 at 15:12		Download
watch_frame.f3d Fusion 360 file for the project fusion - 501.37 kB - 07/05/2026 at 15:12		Download

Components

1 × YEGT002AA https://www.digikey.com/en/products/detail/quectel/YEGT002AA/17101891
1 × BU2450SM-JJ-G https://www.digikey.com/en/products/detail/mpd-memory-protection-devices/BU2450SM-JJ-GTR/3028728
1 × 100pF C0G 0805 311-1111-1-ND
4 × 0.1uF 0805 311-4348-1-ND
1 × LED Red 0805 160-1415-1-ND

View all 19 components

PPS Watch

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Description

Details

Files

watch_band_mount.stl

pcb_frame_mount.stl

watch_frame.f3d

Components

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