SimpleClockEnglish

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project overview
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SimpleClock.jpg
Year 2018
Number of pixels 58
Grayscales / Colors 2
Illuminant rectangular LEDs
Power input
Contact person Arne Rossius
Project website

The SimpleClock is a 4-digit digital clock using an absolute minimum of components. The display consists of 58 red LEDs (2 per segment), connected to an 8-pin ATtiny13 microcontroller using a technique called "CharliePlexing Plus", explained in Tim's Blog.

The mains frequency is used as a time base, hence an AC-AC adapter (transformer) is required to power the clock. If a DC source is used, the time will stand still and the colon won't flash.