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Sensors provide the robot with information about its environment. Different sensors tell your robot about sights, sounds, pressures, temperatures and many other characteristics of the world around it.
Sometimes, because of the large volume of sensory data, special sensors are used to reduce the load on the robotic controller. The special sensors are actually "smart" subsystems with specialized logic to evaluate the data stream and simplify the robotic programming.
With appropriate design, a robotic sensory system thus can receive information about the body and the surrounding environment, and base on these information, the robot can then react accordingly.
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