Sensing the environment
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Flip to reveal answersName four sensors from the guide and what they measure.
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Question
Name four sensors from the guide and what they measure.
Answer
Accelerometer — motion and orientation. Ultrasonic — distance by echo timing. Photoresistor — light. Hygrometer — humidity and air temperature.
Question
Why does an ultrasonic sensor suit a parking aid?
Answer
It measures distance without contact, works in the dark, and is unaffected by the colour of the obstacle.
Question
What four things must be settled after choosing a sensor?
Answer
Whether its output is analogue or digital, whether it needs a divider, whether it needs amplifying, and exactly where it physically sits.
Question
Why does sensor placement matter so much?
Answer
A sensor in the wrong place reads the wrong thing perfectly. A thermostat above a radiator switches the heating off while the room is cold.
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Topic 7.4 hub
Electronic systems applied
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