Computer Science · May / June 2021 · Paper 12 · Question 5
0478
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The question as text
A security light system is used by a factory. The light only comes on when it is dark and when movement is detected. The light will stay on for 1 minute before switching off. Sensors and a microprocessor are used to control the security light system.
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5(a)[2]
Light sensorMotion sensor // infra-red sensor5(b)[8]
Eight from:
Sensors send data to microprocessorData is converted to digital (using ADC)Microprocessor compares data to stored value(s) …… if one value or neither values are within range/out of range/match no action is taken… If both values are out of range/in range/match microprocessor sends signal to switch light on …… 1-minute timer is startedActuator used to switch on/off lightWhen timer reaches 1 minute, microprocessor sends signal to switch light offWhole process is continuous
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