Abstract:
An input device (10), to provide input to a computer system, includes a body (12) defining multiple fluid channels (26). A movable element (28) is located within each of the fluid channels (26) so as to be movable and responsive to a fluid flow through the respective fluid channel (26). A light sensor (38) is furthermore associated with each movable element (28), such that movement of the movable element (28) varies an intensity of light to which the respective light sensor (28) is exposed. The input device (10) generates an input signal in accordance with the intensity of the light to which at least one light sensor (38) of the input device (10) is exposed.