Battery-powered retrofit remote control device

A remote control device that is configured to control a load control device, the load control device configured to control an amount of power delivered to an electrical load, the remote control device comprising:

• a rotary encoder circuit that is configured to translate a rotational force applied to the remote control device into an input signal, and that is configured to operate as an antenna;
• a control circuit that is communicatively coupled to the rotary encoder circuit and that is configured to receive the input signal and to generate a control signal based upon the input signal;
• and
• a wireless communication circuit that is communicatively coupled to the control circuit and that is configured to transmit the control signal to the load control device,
• wherein the rotary encoder circuit includes a plurality of discrete input zones that are electrically interconnected, thereby defining the antenna.

A load control system configured to receive power from an alternating current (AC) power source, the load control system comprising:

• a load control device that is configured to control an amount of power delivered to a lighting load that is electrically connected to the load control device;
• and
• a remote control device that includes:
• a base portion that is configured to be mounted over a toggle actuator of a mechanical switch that controls whether power is delivered to the load control device;
• a rotating portion that is operatively coupled to the base portion and that is configured to rotate relative to the base portion;
• and
• a rotary encoder circuit that is configured to detect a rotational movement applied to the rotating portion, the rotary encoder circuit including a plurality of discrete input zones that are electrically interconnected such that the rotary encoder circuit operates as an antenna,
• wherein the remote control device is configured to transmit, via the antenna, a signal to the load control device in response to detection of the rotational movement of the rotating portion, and
• wherein the load control device is configured to adjust an amount of power delivered to the lighting load responsive to receipt of the signal.