A control knob for controlling operation of a machine, the control knob including: an attachment surface configured for attaching the control knob to a surface of the machine; a display platform that is shaped and dimensioned to allow seating of an electronic display module on a recessed section of the display platform so that it remains in a fixed relative position on the display platform, said display platform comprising the electronic display module disposed thereon; an operational mode display controller for controlling display of operational modes of the machine upon the electronic display module, said operational mode display controller being configured for rotational movement around the electronic display module amongst a plurality of rotational positions, said operational mode display controller being operably connected with the electronic display module such that, responsive to the rotational movement of the operational mode display controller amongst the plurality of rotational positions, the electronic display module is configured to display a plurality of operational modes of the machine corresponding to the plurality of rotational positions; an operational mode selector for controlling selection of one of the plurality of operational modes of the machine when said one of the plurality of operational modes is displayed on the electronic display module, the operational mode selector being configured for depressible movement to actuate selection of the operational mode displayed on the electronic display module; and a contactless motion sensor for sensing motion of the user's hand, the contactless motion sensor being operably-connected to the display platform such that, responsive to the contactless motion sensor sensing motion of the user's hand, the display platform is configured to switch operation from a sleep mode into an active mode; and wherein the control knob is characterised in that it includes a printed circuited board having an electrical connector configured for interconnection with machine systems via wiring to effect power and/or data/signaling communication therebetween and wherein securement tabs extend from the display platform downwardly through slots disposed in the printed circuit board and extend through a central passage of the operational mode display controller so as to engage with corresponding securement tabs extending upwardly through the central passage of the operational mode display controller from the attachment surface. an attachment surface configured for attaching the control knob to a surface of the machine; a display platform that is shaped and dimensioned to allow seating of an electronic display module on a recessed section of the display platform so that it remains in a fixed relative position on the display platform, said display platform comprising the electronic display module disposed thereon; an operational mode display controller for controlling display of operational modes of the machine upon the electronic display module, said operational mode display controller being configured for rotational movement around the electronic display module amongst a plurality of rotational positions, said operational mode display controller being operably connected with the electronic display module such that, responsive to the rotational movement of the operational mode display controller amongst the plurality of rotational positions, the electronic display module is configured to display a plurality of operational modes of the machine corresponding to the plurality of rotational positions; an operational mode selector for controlling selection of one of the plurality of operational modes of the machine when said one of the plurality of operational modes is displayed on the electronic display module, the operational mode selector being configured for depressible movement to actuate selection of the operational mode displayed on the electronic display module; and a contactless motion sensor for sensing motion of the user's hand, the contactless motion sensor being operably-connected to the display platform such that, responsive to the contactless motion sensor sensing motion of the user's hand, the display platform is configured to switch operation from a sleep mode into an active mode; and wherein the control knob is characterised in that it includes a printed circuited board having an electrical connector configured for interconnection with machine systems via wiring to effect power and/or data/signaling communication therebetween and wherein securement tabs extend from the display platform downwardly through slots disposed in the printed circuit board and extend through a central passage of the operational mode display controller so as to engage with corresponding securement tabs extending upwardly through the central passage of the operational mode display controller from the attachment surface.