9. Actuator

An actuator is often part of a computer control system.

The actuator is a mechanical device or motor which carries out the action or decision made by the control system.

For example, in a greenhouse, sensors may measure the temperature. When the temperature rises too much, the control system will send a signal to open the windows or vents.

The actuator is the motor which will open the vents. Likewise, when the temperature drops, the control system will send a message to the actuator (motor) to close the vents.

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