At the Raspberry Pi Foundation, we love a good music project . So of course we’re excited to welcome Andy Grove ‘s ultrasonic piano to the collection! It is a thing of beauty… and noise. Don’t let the name fool you – this build can do so much more than sound like a piano
Read more:
Ultrasonic pi-ano
Do you live in an area with bats? We do, but they’re so fast that they’re very hard to spot when they’re scudding about after insects at dusk; and, of course, human ears are not equipped to hear the ultrasonic tones that they use to make their echolocation calls, so we can’t hear them either.
Go here to read the rest:
Bat Pi