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Computing (FOLDOC) dictionary (also found in English - Vietnamese, English - English (Wordnet), )
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hardware An electronic device used to measure a physical
quantity such as temperature, pressure or loudness and convert
it into an electronic signal of some kind (e.g a voltage).
Sensors are normally components of some larger electronic
system such as a computer control and/or measurement system.
Analog sensors most often produce a voltage proportional to
the measured quantity. The signal must be converted to
digital form with a ADC before the CPU can process it.