Simon Willison Builds Sound Source Triangulation System Beep Locator with Claude Code
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On November 10, 2026, Simon Willison published a post introducing Beep Locator, a system he built with Claude Code. The system consists of a Python server and multiple browser-based listening devices that capture audio together via WebSockets to triangulate the source of an unexplained beeping sound in a room. The final system located the sound source to within about 40 centimeters, successfully identifying it as a carbon monoxide alarm in his home that needed a battery replacement. This is currently the only report on the event, and no further progress has been disclosed.
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- Simon WillisonLocating the source of a mysterious beep with Claude
Simon Willison used Claude Code to build Beep Locator: a Python server plus multiple browser listening devices that coordinate audio capture over WebSockets and triangulate a mysterious beep in a room, achieving accuracy of about 40cm and finding a carbon monoxide alarm that needed a new battery.
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