Maker Cameron Paczek had a creative idea: track the planes flying directly overhead and see them in real time, displayed on his ceiling. Using a Raspberry Pi and a projector, he built a setup that shows live aircraft passing above his home. It's a straightforward project, though you'll need to budget for the hardware—particularly a projector in the fifteen-hundred-dollar range. The result transforms a mundane question—'what's that noise?'—into something you can actually see. Adafruit picked up the project, which has sparked interest in the Raspberry Pi maker community.

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