Two LED rings show the time. The outer ring (60 LEDs) shows the minutes and the seconds (seconds can be turned off), the inner ring (36 LEDs) shows the hour. You can set the time, the on-time, a time-correction and the brightness via one single button. The display mode can be changed to either just one smooth moving pixel or a filled circle.
Everything is controlled by one Atmega328. The PCB is only 28mm in diameter. The housing is made from wood of an old apple tree.
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