The build relies on that old stalwart, the Arduino Uno, to run the show. It’s hooked up to a DS3231 real-time clock module so it can keep accurate time for long periods, as is befitting a clock.

Features only on Uno R4 WiFi (right) and not on Uno Minima Wi-Fi 2.4GHz 802.11b/g/n up to 150Mbit/s Bluetooth 5 Built-in antenna 12 x 8 LED matrix Qwicc-style connector for 3V3 I 2 C – additional ...

– Compatible with Arduino UNO – Three Buttons – RTC – Real Time Clock Extremely accurate RTC on board Temperature sensor inside Easy to use with the Arduino “DS3232RTC.h” library ...

Architecture Inspired Arduino Binary Clock Kits (video) 1:37 pm June 7, 2017 By Julian Horsey ...

If you’re dealing with RF, you’ll probably have the need to generate a variety of clock signals. Fortunately, [Jason] has applied his knowledge to build a SI5351 library for the Arduino… ...

DOTKLOK Is A Hackable, Open-Source, Arduino Clock. Also Neat Looking Contributor 2:24 PM PST · February 23, 2011 ...