Rotational sensing

A user interface comprising a knob, an integrated circuit for monitoring said knob, said integrated circuit comprising a magnetic field sensor and circuitry for measuring the inductance of a structure, and wherein a permanent magnet and a metal member are attached to said knob, with rotation of said knob detected by the magnetic field sensor due to corresponding rotation of said magnet, and wherein a user press on said knob is detected by the inductance measurement circuitry due to corresponding movement of said metal member relative to said structure, and wherein from a low-power state, a rotation of said knob from a starting rotational position to a first rotational position is detected by the integrated circuit;

• wherein said first rotational position is stored;
• with a first press event for said knob interpreted by the integrated circuit as an activation command to energize a load at a level corresponding to said stored first rotational position;
• with a second press event for said knob interpreted by the integrated circuit as a command to deactivate said load and wherein a third press event for said knob is interpreted by the integrated circuit as a command to reactivate and to set the knob rotational position and a corresponding load consumption level to one of the following:
• a minimum value rotational position;
• said stored first rotational position;
• and
• a predetermined rotational position.