A human machine interface includes a capacitive sensor disposed on an interior side of a face plate. A control device is rotatably coupled to the face plate and is disposed on an exterior side of the face plate. The control device includes at least one electrically conductive element. The control device rotates about an axis substantially perpendicular to the face plate such that the at least one electrically conductive element follows the rotation of the control device. The capacitive sensor senses a rotational position of the at least one electrically conductive element.