The Berlin-Clock or set theory clock has been developed by Dieter Binninger in the mid-seventies. Originally, it was standing at Kurfürstendamm in Berlin. A copy was installed at the Sparkasse building in the city center of Oldenburg. The time can be read by adding packages of 5- and 1-hours and minutes, respectively. I added the day of the month with the same coding. A bar at the bottom shows the power left. A must have for Berlin-Marathon runners ;-) Enjoy.
V 1.2: If connected via bluetooth, the upper round lamp will be red instead of yellow. Additionally, the power bar at the bottom is coloured red during charging.
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