Vision & Robotics: Local AI That Sees and Movesbeginner · ~150 min

Count the Spin — Turn the Camera You Own Into a Non-Contact Tachometer

The fan, the drill press, the lathe, the pottery wheel, the grinder — every one of them has a speed that matters, and almost none of them will tell you what it actually is. So why is the honest answer still a fifty-dollar gadget you do not own?

This project turns the camera already in your pocket into a tachometer, and then does the part the gadget never does: it teaches you the one specific way a camera lies about speed, shows you that lie happening on purpose, and gives you a two-minute test that catches it every time.

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What you'll do

A small folder of Python programs on your own machine, written by Claude Code, that take an ordinary video clip of anything that spins, turn one high-contrast mark passing a small patch of the frame into a brightness signal, and report the speed in revolutions per minute together with an honest uncertainty — plus a dated camera.json recording your camera's real capture rate in each of its modes, which you measured yourself against a rotating target of known speed rather than trusting the number written in the file. You will also own the test that tells you when the answer is aliased and therefore confidently wrong.