Using your earbuds to stream music or take calls is second nature, but holding one up to shoot digital ducks on your computer display is completely new. Independent developer Dividivan recently created BipBop, a free Mac app that turns a single AirPod into a motion-sensing controller for retro arcade games. Turning earbud motion sensors into a game controller The app relies on the built-in gyroscope inside Apple‘s wireless earbuds, which usually tracks head movements for spatial audio. By holding an earbud in your hand and aiming it at your Mac display, those internal sensors turn your wrist movements into an…