External Reference with Portenta

Hardware Portenta Portenta H7
1

Hello Everyone:

I am trying to use external reference voltage with Portenta H7. However, I consistently get this message ''EXTERNAL was not declared in this scope''. I have checked the Arduino forum and found out that some of the other users have the same issue. Can you provide your comment, please?

Thank you

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According to documentation the EXTERNAL macro is only used in AVR microcontrollers.

For Portenta there is no section (yet).

According to documentation this is for mbed-enabled boards but it says NANO 33 BLE only:

Arduino mbed-enabled Boards (Nano 33 BLE only): available when using the Arduino mbed-enabled Boards platform, or the Arduino nRF528x Boards (Mbed OS) platform version 1.1.6 or later

  • AR_VDD: the default 3.3 V reference
  • AR_INTERNAL: built-in 0.6 V reference
  • AR_INTERNAL1V2: 1.2 V reference (internal 0.6 V reference with 2x gain)
  • AR_INTERNAL2V4: 2.4 V reference (internal 0.6 V reference with 4x gain)
3

I've been trying myself with no luck so far. I have only got the default 3.3V working but it's very noisy.

Very keen to find out when this will be added!

Rob

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