Locating the source of a mysterious beep with Claude

Simon Willison describes using Claude Code to build "Beep Locator," a Python web app that connects multiple devices as microphone listeners over WebSockets to triangulate an intermittent beep in a box room, drawing on the 2007 BeepBeep acoustic ranging paper. The system located the beep to within about 40cm, leading him to an old carbon monoxide detector needing new batteries. He highlights the approach of giving Claude Code "ears" by having it run code that analyzes microphone audio and hot-swap new JavaScript onto listeners.