sensor
<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.
Digital sensors most often use serial communication such as EIA-232 to return
information directly to the controller or computer through a serial port.
(1997-04-15)
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