E.D.K.: 8 Bit Regenschirm
“When raindrops strike the outside surface of the umbrella canopy, they are converted to tones by the the presence of twelve piezo pickup sensors which are taped to the underside of the umbrella and respond to vibration”, is explained on LikeCool. “The piezo’s are then fed into an Arduino Uno, (…), which is in turn connected to two speakers.”
via, dank u!