Control devices and systems for self-propelled machinery and related methods are disclosed. In one aspect, a control device for self-propelled machinery includes a central portion disposed between a first gripping portion and a second gripping portion and at least one pressure sensitive trigger control provided over either the first or the second gripping portion. The trigger control can be configured to reduce a speed of the self-propelled machinery by actuating a portion of a potentiometer for varying an electrical signal carried by the control device. In some aspects, the control device can electrically communicate with a control unit of the self-propelled machinery.