Raspberry Pi GPS digital clock

[imjasonh]

A long long time ago (like 6 years!) I made a little clock from an Arduino, some seven-segment displays, and a GPS unit that displayed the current number of seconds since the Unix epoch. It was fun because it got the time from GPS, so it never needed to be set.

It worked okay, looked terrible, and was kinda fun. Eventually it gathered enough dust that I gave it away to someone to actually use.

Well now I want to make it again, probably with a Raspberry Pi Pico, and as an excuse to learn some embedded Rust.

• https://www.youtube.com/watch?v=Yi0WRF5WPFw <-- inspiration for resurrecting this idea
• RPi Hardware Abstraction Layer: https://github.com/rp-rs/rp-hal
• https://docs.rs/adafruit_gps/latest/adafruit_gps/ - doesn't seem to include time data in responses, only dates? 🤔

Shopping list:

• Pico (£3) https://thepihut.com/products/raspberry-pi-pico
• 4-digit 7-segment display ($10/ea) https://www.adafruit.com/product/879 -- I'd need 3 to display a Unix timestamp
• GPS unit:
  • this one is $17 but might suck
  • this one from Adafruit is $30, I think it's the one I had before...

If I'm feeling smart I could add a button that toggles between Unix timestamp, lat/long, elevation, etc., who knows what else.

[imjasonh]

https://www.youtube.com/watch?v=SNqm5T5syTM

https://mitxela.com/projects/precision_clock_mk_iii

Similar idea, but showing an ISO timestamp, with the goal of being as precise and accurate as possible.