Simon Willison vibe-codes a Beep Locator with Claude Code to triangulate a mystery beep using five devices
RealGeneKim · x · 2026-11-10
When an intermittent beep started coming from somewhere in Simon Willison's room of unpacked moving boxes, he had Claude Code build "Beep Locator": a Python web server plus any devices you can spare (he used two iPads, a phone, a MacBook Pro and a Surface Ultra) joined via QR code as listeners.
Devices play sounds to each other to estimate their positions, with a "Rough mode" to hand-place icons when that fails, and a clap mode to verify the system can localize known sounds. Each detected beep appears as an X on the map with a replayable log entry; once the mystery beep is confirmed, the system tracks it continuously. A full, reproducible example of solving a real-world problem with an AI coding agent.
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