Locating the Source of a Mysterious Beep

Simon Willison used Claude Code to develop "Beep Locator," a software system that triangulates the source of a mysterious beeping sound in his home by using multiple devices (iPads, phones, and laptops) as acoustic listeners positioned around a room. The system successfully located the beep to within 40cm, revealing it was an old carbon monoxide detector with dead batteries hidden in a pile of boxes.