The most accurate clock in a mini rack

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