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Frank Zhao's USB Card

A resourceful student from the University of Waterloo (Canada), not knowing how to occupy his free time, suddenly decided that he needed electronic business cards for him.
Making a scheme was easy; It housed 3 resistors, 1 capacitor, stabilitron and microcontroller ATtiny85:

It turned out very even nothing:

The microcontroller captures a few clicks of caps lock and here's how it all works in the end:

Detailed description .

Source: https://habr.com/ru/post/107357/

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