External signals are usually fundamentally different from those the microcontroller understands (Ones and Zeros), so that they have to beconverted in order for the microcontroller to understand them. An analogue to digital converter is an electronic circuit which convertscontinuous signals to discrete digital numbers. This module is therefore used to convert some analogue value into binary number and forwards itto the CPU for further processing. In other words, this module is used for input pin voltage measurement (analogue value). The result ofmeasurement is a number (digital value) used and processed later in the program.
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