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Computers can measure external conditions using sensors.

Different sensors are used to measure different conditions:

Sensor Standard Unit of Measurement Condition Measured
Temperature sensor Celsius (oC) How hot/cold it is.
Light sensor Lux How light/dark it is.
Sound sensor Decibels (dB) How quiet/loud it is.
Pressure pad On/Off If a pad is being pressed.
Button On/Off If a button is being pressed.
Passive Infra Red (PIR) On/Off If an objects moves in an area.

Displaying the Measurements

When you’ve attached a sensor to a computer, it is easy to display the measurements.

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