Claude Code Tracks Down a Mysterious Beep to Within 40cm
Locating the Source of a Mysterious Beep
When an intermittent beep started coming from a room full of unpacked boxes, Simon Willison had Claude Code build Beep Locator: a Python server that turns spare phones, tablets, and laptops into microphone listeners over WebSockets. The devices chirp at each other to calibrate their positions, then triangulate any detected sound on a map. It pinpointed the beep to within about 40cm — leading to an old carbon monoxide detector begging for fresh batteries.
I think the most interesting part of this project is that I demonstrated it's possible to give Claude Code ears.