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 aSEIA-232 to return information directly to the controller or computer through a Serial port. (1997-04-15)
