+A **sensor** is a device that detects and responds to some type of input from the physical environment. It converts this [Physical Quantity](/wiki/physical-quantity), such as light or temperature, into a measurable [Electrical Signal](/wiki/electrical-signal). This signal can then be interpreted by other devices.
+## See also
+- [Actuator](/wiki/actuator)
+- [Transducer](/wiki/transducer)
+- [Control System](/wiki/control-system)
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