An apparatus and method for rotary code-based control for command systems. A flight deck module comprises a knob connected to a shaft; a plurality of sensors affixed to a surface of a printed circuit board, the printed circuit board connected to the shaft; and a carrier platter. The carrier platter is connected to the shaft and a plurality of sources is affixed onto a first side of the carrier platter in an arcuate orientation (such as in a circular fashion along the circumference of the carrier platter or spanning a sector of a circle).