Note that we have an Analog Reference (Aref) Voltage also, which will be considered equivalent to 1023 and any voltage value less than this Aref will have less number than 1023. AVR convert it into 10-bit number of range 0 to 1023. AVR microcontrollers has inbuilt ADC facility to convert analog voltage into an integer. ADC is one such hardware which measures analog signals and produces a digital equivalent of the same signal. In short, Analog signals are real world signals around us like sound and light.ĭigital signals are analog equivalents in digital or numeric format which are well understood by digital systems like microcontrollers. The process of converting an analog value into digital value is known as Analog to Digital Conversion. This type of conversion is carried out by Analog to Digital Converter (ADC). So for transferring external continuous information (analog information) into a digital/computing system, we must convert them into integer (digital) values. The computing system understands this by converting them into binary numbers. However, when we want to communicate with the “digital” world, it is crucial to use digital values which can be easily recognized by the computing systems. Did You Know? The “real” world we are living in is Analog! Whether it is sound, light, temperature or humidity, all are continuously varying things.
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