The conventional desk fans rely on manual user inputs such as buttons or some sort of mechanical inputs that require user’s physical contact. The Smart Fan, however, is a fan that is purely operated by sound as user input to adjust speed and directionality of the fan. The device listens for user to provide sound input such as clapping, snapping or tapping through microphones attached on the front and the sides of the device.
Choi, Sang and Sunday, Shawn, "Smart Fan" (2016). Mechatronics Final Projects. Paper 2.