Recent versions of the Raspberry Pi support USB on-the-go (USB OTG), which allows them to impersonate USB devices such as keyboards, thumb drives, and microphones. To take advantage of this, I made an open-source web app that turns my Pi into a fake keyboard. I call it Key Mime Pi. This post demonstrates how Key Mime Pi works and how you can build one for yourself. Demo What you’ll need A Raspberry Pi that supports USB OTG: Raspberry Pi 4 (all variants) Raspberry Pi Zero W Raspberry Pi A and A+ (verification needed) This source claims that early Pis support USB OTG, but I have not tested these devices personally.