A simulation of the ["Berlin-Uhr"](https://de.wikipedia.org/wiki/Berlin-Uhr) - discoverable in real life at Ku'damm in front of the Europa-Center in Berlin.
The original clock was the "first clock in the world to display time with luminous colored fields". As a tribute to its inventor Dieter Binninger and because it looks pretty damn cool, it is brought back to life on your card10.

### how to read the clock:
- hours: Multiply segments from row 1 by 5 and add the result with segments from row 2
- minutes: Multiply segments from row 1 by 5 and add the result with segments from row 2

### extra functionalities that differ from the classic Berlin-Uhr:
* displays seconds on the outer border of the display (can be turned on/off by lower left button)
* press upper right button to display the current date in berlin-uhr-ish style
* press lower right button to show a overlay of clock/date in arabic numbers (good for beginners to learn how to read this clock)
* automatically adjust the brightness of the display and the seconds LED


#### pull requests welcome
https://github.com/christian-draeger/card10-berlin-uhr