想起当年的DOS时代，软件狂人经常编写一些恶作剧的病毒来“展示自己的才华”，而硬件工程师只有在旁边羡慕的份儿。

今天我找到一个可以硬件恶作剧的，给常年备受煎熬的硬件工程师们一个机会。

整个电路很简单，效果可不一般!

这个Stealth USB CapsLocker的整个电路唯一的核心元器件就是ATTiny45，AtTiny45本身没有内置的usb驱动器，但是有一个开源的代码库AvrUsb，可以使avr模拟usb通讯。-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 .