Thanks. So in theory, if my VCC drops to 4.8v, I should multiply every value in A0-A5 by 1.041 to get its real value, assuming that item is a 5v item ?
Is there a real way to test this?
What if I get my 5v battery power source, measure VCC @ I assume 5v. Measure a 1.5v AA battery on A0. Then let the arduino power batteries go flat. When VCC gets to 4.8v, take a second reading from A0, and it should be 4% lower ? Maybe?
How low can the source arduino power get before it will no longer function?