Cadbury has created an interactive jacket that responds and lights up as the wearer eats chocolate as part of its ongoing "Joyville" themed campaign. London design firm Hirsch&Mann designed the jacket on behalf of Cadbury's PR company Golin Harris; it's intended to amplify the joy experienced by a person as he or she enjoys two different flavors of Cadbury chocolates; Cadbury + Daim and the Cadbury + Oreo. The technology uses Raspberry Pi controllers. The coat is triggered to light up when a sensor picks up chocolate traces. A "blinking heartbeat" then appears in the middle of the jacket and finally, music blares out of hidden speakers as confetti explodes out of the coat's collar.