Toddler paints on a wall. GoPro + OpenCV track the crayon.
Wall-KidPix is a real-world hardware project: project a KidPix-style drawing canvas onto a wall, let a toddler paint with a foam crayon, and OpenCV tracks the tip in real-time. The Gesture engine recognizes dwell (hold crayon over a button ~0.9s to trigger SAVE/UNDO/CLEAR, no physical hardware). Finished drawings compile into print-ready PDFs with captions for the grandparents.
Built in Python with OpenCV and pygame-ce. The GoPro Hero 11 streams via USB-NCM (self-hosted UDP, no vendor utility required). Marker tracking tested headlessly, live capture proven on real hardware. The build showcases the power of combining cheap hardware with free software to create a delightful physical experience.
