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Ralf writes –

“You’ve been in a meeting and you thought somebody wasted your time with bla bla? There was an appointement and ten persons kept waiting for (an important) one who doesn’t care when he is frequently late? Here’s what you could enjoy meanwhile. This is inspired by this and this.

Internally it uses 2 ATTiny2313 that communicate via their serial interface. One runs a clock with a multiplexed 7 segment LED display and a “reset to 00:00” button – the other one has a button to increase the multiplier and shows it on the 2 digit multiplexed display. How to do the display? Here we go… I’ll be updating this with the serial communication code for the ATTiny2313 multiprocessor system :-) as well. Enjoy. “Link.