Getting maximum range out of XIAO nrf52840 with bluefruit.h

Products & Technology XIAO
14

I tried to do it like this:

  • look for hardware-pin on seeed-schema
  • look for same pin on feather-schema
  • use pin-number of feather
  • example: A4 → P0.04 → 14/A0

image
image640×346 102 KB

circuitpython_Adafruit_Feather_nRF52840_Pinout.png

However, this does not work for certain pins, as I do not find them on the Adafruit-schematic.

For example, D9 / P1.14 does not exist on Adafruit.

I am really lost, any help appreciated