Another use I had for a Small Board Computer was as a door security system. The Raspberry Pi with attached Adafruit touchscreen and camera would be perfect for this. Also add a magnetic sensor for “door open”, and a more general motion or even position sensor.
I actually got most of the way through the basics of this project. One of the problems I ran into was getting a clean picture to the rpi’s camera through the door’s existing peephole. It would probably be best to figure out a solution better suited to the camera, and just swap out eye-pieces when the door camera is installed (remembering to keep the original one for replacement if you ever need to).
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