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Definitions Edit

An actuator

detects an incoming signal and respond by changing something in the environment. For example, a relay is an actuator that toggles a mechanical switch, and can thus cause a good number of responses to occur such as enabling illumination, heating system, audible alarm, and so on. Actuators such as motors, pneumatics, and hydraulics can move objects and pump fluids.
[is] a mechanical device for moving or controlling a mechanism or system. It takes energy, usually transported by air, electric current, or liquid, and converts that into some kind of motion.[1]
[is a] device which conveys digital information to effect a change of some property of a physical entity.[2]

References Edit

  1. IoT-A Terminology (full-text).
  2. Framework for Cyber-Physical Systems, at 5.

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