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You don't need a mechanical robot for that. Just need a device masquerading as a keyboard just sending that stuff in.

Good point, though the price will be similar. I unleashed my robotic dreams for no good reason.

you can already do this with a flipper zero + badusb.

Nice. Flipper zero is pretty pricey tho, and in this case a simple dev board with usb (like stm32) will suffice ;)

Of course, you can do it cheaper. The advantage of the flipper is its form factor. It just looks like some kind of toy.