This disclosure describes a mechanically operated controller for a mobile device. The controller includes a grid of black and white squares whose pattern can be mechanically changed. Particular patterns are read by a mobile device, e.g., via its camera, and interpreted as different commands. The mechanical controller can be used as an interface between a mechanical device, e.g., a musical instrument, and the mobile device.
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Bakir, Gökhan and Lange, Joseph, "Mechanical controller for a smartphone", Technical Disclosure Commons, (December 19, 2018)