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Sensors measure physical quantities like contact,
distance, light, sound, strain, rotation, magnetism,
smell, temperature, inclination, pressure, or altitude.
Sensors provide the raw information for processing
into meaningful information. With meaningful sensory
information, robots can then have an understanding
of their surrounding environment and make changes
in their behaviour based on the information they
have gathered.
Well, unlike human, not all robots have sensory
systems, and few have the ability to see, hear,
smell or taste. The most common robotic sense is
the sense of movement -- the robot's ability to
monitor its own motion. Acoustic sensor may be used
in this case to detect motion or location, and sometime
sound. Additionally, a robot might have an infrared
sensors to detect heat sources, contact sensors,
tactile sensors to give a sense of touch, or optical/vision
sensors.
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