Computer Science for IGCSE & O level - Hardware (Section 3 - No. 28)
In a greenhouse environment control system, what signal does the computer send if the humidity level is below the pre-set value?
A signal to turn on the heater.
A signal to spray water into the air.
A signal to close the vent.
A signal to measure temperature.
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When the humidity is below the pre-set value, the computer sends a signal to spray water.