You’ve probably heard the old saying that if it looks like a duck, and it quacks like a duck… So when is a keyboard a mouse? When software makes it quack like a mouse — that is, if mice quacked. [Blackle Mori] took a cheap USB keypad and, using the libevdev Linux system, made it impersonate a mouse.

The code on GitHub isn’t complex, but the details can take some time to get right. The code takes over all input events from the device. [Blackle] dumped out events sent from the keypad, but the stock evtest program would probably have done just as well.

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