Question

What is the use of the analogReference() function?

(a) To change the digital signal reference value

(b) To change the analog signal reference value

(c) To print the analog signal reference voltage

(d) To print the digital signal reference voltage

The question was asked in my homework.

This is a very interesting question from Analog Input Output topic in portion Arduino Programming of Arduino

Answer 1

The correct answer is (b) To change the analog signal reference value

The explanation: The analogReference() function changes the value of the internal reference voltage for all analog calculations in the Arduino Board. For the function to work properly we need to supply the desired voltage level to the AREF pin on the Arduino Board physically before invoking the function. However, any voltage greater than 5V is not recommended since it can damage the board.