Reminds me of the DOS era, the preparation of a number of software often mischievous madman virus to " show their talent" , and hardware engineers in the next, only the envy of the negotiations. Today, I can find a hardware mischief to the perennial suffering hardware engineers a chance. The whole circuit is very simple, the effect may in general! Stealth USB CapsLocker The whole circuit is the only core components ATTiny45, AtTiny45 does not have built-in usb drive, but there is an open source code library AvrUsb, can avr analog usb communication .

CapsLocker.txt
CapsLockerCode.zip

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