Hi I am using Arduino nano with the Atmega 328p. VRef is internal (1.1V) When the board is powered via the usb the supply voltage is 4.5V from my pc. When I use an external 12v power supply ,connected to Vin ,(build in 5V regulator)the voltage is 4,96. Changing between the pc and the external p…

Analog read different with external and usb power

holmes4 May 3, 2018, 10:17am 5

What is the default setting of the reference voltage in Arduino?

Vcc

Mark