I assume you know a 328 should not be clocked at 16Mhz below ~3.85volt.
Will my arduino automatiicly lower its speed to 8 mhz when it get below 3.7 v?
And switch the Aref to INTERNAL (1.1volt Aref).orMeasure it internally, with code.
will it change ref voltage for 1 channel or all the channels ?
can i use adc1 with ref v of 1V and adc2 with original ref v ?