A command selector includes a scroll wheel mounted in a support and free to rotate about a main axis, a fixed printed circuit board, a detection wheel rotating about a secondary axis, a means of transmission rotationally connecting the scroll wheel to the detection wheel of which the rotations are detected by a rotation sensor arranged on the printed circuit board. The main axis and the secondary axis are non-parallel, the means of transmission defines an angle, and the detection wheel rotating in a plane parallel to the printed circuit board, the secondary axis being perpendicular to the printed circuit board, so as to minimize the circumscribed volume of the selector.