I have a project requiring a lot of power, hence the laptop PSU part. I don't want to have to power the Arduino separately via USB so Ive stuck a 12v regulator (LM7812) between the 19v input and Arduino VIN. Only problem is the analog voltage inaccuracies. I've set the AREF to external (4.30v as I…

Inaccurate analog readings when powered via laptop PSU

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