I have been reading articles and watching videos the past hours.
The AREF pin will only read a max of 5v - which means that if I wanted I were to use 2 resistor to split the power of the 12v down to 5v the AREF would need to be fed from that same line if that is the voltage I want to monitor is that correct?
Here is what I am thinking and I want to know if I am thinking correctly.
I can supply the board with 12v for power 12v1 and I can then convert 12v2 down to the 5V the inputs need.
I am unsure If the ground connects to the ground next to the digital inputs and if the external AREF needs a ground also?
If this wiring is correct, then it just programing to get it to print the voltage.
My goal is to sense a change or drop in voltage from 12v2 to trigger another action.