The controlled environment could be controlled by an array of controlled output devices such as dampers, fans, and variable- frequency drives.
Controlled output devices : control devices are output devices which works together with sensors . Sensors gather 'measurable' data from the environment and input it into the computer. They do not need any human involvement . Sensors typically gather data such as temperature , pressure ,pH etc.
Data gathered by a sensor is input into a computer which then decides what to do with the data (processes it)
Once the computer has decided what to do with the data it sends instructions to the control device .
The control device then physically changes something in response to commands received from the computer.
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