Change ADC Reference of Arduino Due

Official Hardware Mega Due
1

Hi everybody out there! This is my first post, so please bear with me. Today, I was experimenting with the Arduino Due and wanted to read the voltage of the battery that was powering it. I realised from reading several other forum posts that the ADC reference has to be changed, and I had success doing that with an Arduino Uno. However, on the Arduino Documentation, it states that the ADC reference of the Arduino Due cannot be changed. Thus, I would like to ask if there is any way to change the ADC reference of the Arduino Due?

Any response would be greatly appreciated.

2

The ADC reference can't be changed.

You might consider reading the Atmel Application Note before using the ADC peripheral in order to calibrate the ADC:

https://www.microchip.com/wwwAppNotes/AppNotes.aspx?appnote=en591316

3

Voltages higher than reference can be read by interfacing the input through a voltage divider of two resistors.