What is the role of sensors in robotics control loops?

• A. It powers the robot
• B. Sensors provide input data used to adjust behavior
• C. Sensors generate power to actuators
• D. Sensors have no role in control loops

Answer: (B)

Sensors provide input data used to adjust behavior. In a robotics control loop, sensing gives real-time measurements of the robot’s state (like position, orientation, speed) and sometimes the environment. The controller compares these measurements to the desired setpoints and computes an error signal. That error drives the control law to generate commands for the actuators, continually adjusting motion or actions to achieve the goal. Without sensor feedback, you wouldn’t know how you’re actually performing, so you’d be unable to correct course, which is why sensing is fundamental to closed-loop control. Sensors do not power the robot or actuators, and saying they have no role would ignore the essential feedback they provide.