Rotation Input Device For a Capacitive Sense Cord

A system comprising:

• a capacitive sense cord having a plurality of sensing wires disposed throughout a first portion of the capacitive sense cord that is sensitive to touch input and a second portion of the capacitive sense cord that is insensitive to touch input, the plurality of sensing wires being twisted around one another within a cable jacket of the second portion of the capacitive sense cord, the plurality of sensing wires being disposed proximate to a surface of the first portion of the capacitive sense cord and positioned lengthwise along the first portion of the capacitive sense cord to form a rotation input device;
• and
• a controller implemented at the capacitive sense cord, the controller configured to:
• measure capacitance values associated with the plurality of sensing wires;
• detect a pattern of change in the capacitance values;
• determine that the pattern of change in the capacitance values corresponds to rotational input to the rotation input device;
• and
• initiate one or more functions at a computing device communicatively coupled to the capacitive sense cord based on the rotational input.

A method implemented by a controller coupled to a capacitive sense cord that includes a capacitively sensitive portion that is sensitive to touch input and an insensitive portion that is insensitive to touch input, the method comprising:

• measuring capacitance values associated with sensing wires of the cord;
• detecting a pattern of change in capacitance-sensing channels of an integrated circuit that are coupled to the sensing wires;
• determining that the pattern of change in the capacitance-sensing channels corresponds to rotational input to the capacitively sensitive portion of the cord;
• and
• initiating one or more functions based on the rotational input.