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Attiny84 based LED clock

There is never enough of digital clocks. They come in different shapes and ways of displaying time. Chris have put his own version of simple digital clock that is driven by attiny84 microcontroller. The indicator is made of 24 LEDs interfaced through couple of 74HC595s shift registers. LEDs are soldered in couple circles where one indicates hours and another minutes in 5 minute intervals. Seconds though are indicated by blinking LED.


Clock is algorithm is run in software inside attiny. Code is written using Arduino, what made whole programming a lot easier. From looks of it it is hard to tell if there is an external crystal, so I wouldn’t expect great precision of time-count. Circuit was assembled on prototyping board which is well covered with semitransparent enclosure.

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