Question

What does analogRead return?

Answer 1

The analogRead is a command mainly used to program the analog pins on the board. If you are using analogRead functions, it indicates you are making the pins as input i.e. you can connect the Arduino analog pins with any sensor and read its value by making the analog pins as input.Nov 17, 2018

How to use analogRead in Arduino? - The Engineering Projects

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The microcontroller of the board has a circuit inside called an analog-to-digital converter or ADC that reads this changing voltage and converts it to a number between 0 and 1023. ... In between, analogRead() returns a number between 0 and 1023 that is proportional to the amount of voltage being applied to the pin.