In a robotic control loop, which component processes sensor data and drives the motor?

• A. Controller
• B. Sensor
• C. Servo
• D. Battery

Answer: (A)

In a robotic control loop, the controller is responsible for taking sensor measurements and converting them into motor commands. It runs the control law (like PID or state feedback) using the current sensor data and the desired target, and outputs a signal that tells the motor driver how to move. This is what closes the loop: sensors provide the state, the controller computes the correction, and the motor acts on that command. The sensor’s job is to provide readings, the motor (often called an actuator or servo) executes the motion, and the battery simply supplies power. So the processing and decision-making part is the controller, which is why it’s the best answer.