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Stealth USB CapsLocker | by macetech
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Stealth USB CapsLocker

Made in under an hour, from idea to completed hardware. Yeah, it's messy. But it's a full featured USB device that emulates an HID keyboard, based on the ATTiny45 and Obdev's AVR USB software interface. This device presses the CapsLock key at random intervals from 30 seconds to 8 minutes. It could be used to do random keypresses, mouse movements, etc. But CapsLock is very low risk, and very high annoyance. Since the CapsLock LED on the computer's real keyboard is controlled by the computer, it also turns on and off when the CapsLocker activates. Very sneaky because it looks like the user accidentally pressed CapsLock. Except it happens maybe 20 times in an hour....

 

I'm still finishing this writeup, but will post the schematic, PCB, and code here: macetech.com/blog/?q=node/46

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Uploaded on April 1, 2008