The sensor is a device that changes of physical quantities into electrical quantities. Temperature is a measure, because it can be measured, monitored and can be used in almost any physical system. The amount that must be represented in an efficient and accurate value to be put to good use. There are basically two ways to represent the value of these quantities, which are digital and analog.
In analog representation, a quantity represented by other comparable magnitude proportional to the amount of the first. The word can be interpreted as an analog line. An example is the mercury thermometer. At the measured temperature change, high mercury in the thermometer capillary tube was also changed following the change in temperature. Characteristics of the analog scale is an important change in the continuous range of values (continuous).
In a digital representation, the magnitude is not represented by other comparable magnitude, but by a symbol called a digit or digits, as opposed to a digital representation of the analog. If the analog value is continuous change, then the change in discrete digital values.
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