The most popular RTC for the Arduino is the DS1307. However, it does have some drawbacks, the most notable of which is that its operating voltage is 5v, which means it cannot be used with 3.3v ...

Posted in Arduino Hacks, clock hacks Tagged 1307 RTC, arduino nano, Berlin clock, blinkenlights, clock, set theory, set theory clock, shift registers ...

1307 RTC 2 Articles Light Duty Timekeeping: Arduino Berlin Clock December 1, 2015 by Kristina Panos 13 Comments ...

By adding an Arduino compatible board, an RTC Arduino module, and a code from the EasyNixie library, users can create their own nixie clocks with relative ease.

The Arduino uses latitude and longitude to help decide when to click on the lights, so it's incredibly accurate. Otherwise, the build just includes an on/off switch, a Tiny RTC, a time adjustment ...