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Sensors are input devices that record data about the physical environment around it. Sensors send data to a microprocessor (computer). They do not make judgements, decisions or control any output devices. There are many types of sensors used in a variety of household, commercial and industrial applications.
Sensors are used to measure physical quantities such as temperature, light, pressure, sound, and humidity. They send signals to the processor. For example:
Source: https://www.bbc.co.uk/bitesize/guides/zpw2pv4/revision/2
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