Metro M4 Express
A0 is between VIN and A1, and is located along the
same side of the board as the barrel jack adapter
towards the middle of the headers found on that side of
the board.
On the Metro M4 Express, there are TWO true analog
outputs: A0 and A1.
© Adafruit Industries
https://learn.adafruit.com/adafruit-feather-m4-express-atsamd51
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