The voltage divider has to be set for the AREF to get a true reading You pick a voltage range 0 to 15
Then you pick the resistors to read full scale at your AREF voltage is how you get a true reading.
The voltage divider has to be set for the AREF to get a true reading You pick a voltage range 0 to 15
Then you pick the resistors to read full scale at your AREF voltage is how you get a true reading.