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        I wanted the most accurate clock possible in my mini rack. But nobody makes clocks for mini racks!

So I made my own.

Parts required for this clock build (some links are affiliate links):

  - Waveshare L76K GNSS Module for Pi Pico: https://amzn.to/4nKlL5J
  - Adafruit 0.56" 4-Digit 7-Segment Display w/I2C Backpack: https://www.adafruit.com/product/879
  - Raspberry Pi Pico 2 (with Headers): https://www.raspberrypi.com/products/raspberry-pi-pico-2/
    - If you don't have the 'with Header' version, solder on 2x 20 pin headers: https://amzn.to/4jClLn1
  - Waveshare L76K GNSS Module for Pico: https://amzn.to/4qgiFaQ
  - 15cm jumper wires: https://amzn.to/4aT5jwj
  - 1220 3V Lithium coin cell battery: https://amzn.to/3YzptnL (if you want RTC clock holdover)
  - M2x6mm screws: https://amzn.to/45NaeLM (optional, to hold the display in securely)

Full instructions and code on GitHub, in my time-pi project:

https://github.com/geerlingguy/time-pi/tree/master/pico-clock-mini-rack

3D design files for printing are on Printables:

https://www.printables.com/model/1549682-pico-gps-clock-1u-mini-rack-faceplate

Support me on Patreon: https://www.patreon.com/geerlingguy
Sponsor me on GitHub: https://github.com/sponsors/geerlingguy
Merch: https://www.redshirtjeff.com
2nd Channel: https://www.youtube.com/@GeerlingEngineering
3rd Channel: https://www.youtube.com/@Level2Jeff

Contents:

00:00 - A Pico GPS Clock
02:34 - Modeling a 1U mini rack panel
05:59 - Clock face extrusion
07:19 - V3 and day two
08:22 - V4 clock and Pico fitment
10:17 - Debugging the clock
11:17 - LCD Lenses and Kapton test
12:25 - PPS and 1U mini rack

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The most accurate clock in a mini rack

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