I'm Dr. Torq and have a Raspberry Pi in my Steampunk conference badge. Use it during my tech talks. I walk into the room, power down the badge, plug in the HDMI, power up the badge and run my slides with a nano-keyboard/mousepad and LibreOffice. Works great. When I'm walking around a show, the badge displays a little promotional video on it's 3.5" touch-screen. Runs on a big cell phone power pack, in my pocket. See my gadgets and hacker articles at https://thenewstack.io/author/rob-reilly/.