Box for DCF77 Receiver
thingiverse
You can purchase a simple DCF77 clock receiver, which is an European atomic clock, on eBay for a few euros. The goal is to attach the 4 wires directly to an Arduino chip, and there's a library that makes it easy to read out the signal: https://blog.blinkenlight.net/2015/08/01/dcf77-library-release-3-0-0/.
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