The following resources may be useful working with the Bluefruit nRF52 Feather:

• Adafruit_nRF52_Arduino: The core code for this device (hosted on Github)
• nRF52 Example Sketches: Browse the example code from the core repo on Github
• nRF52832 Product Specification v1.4: Key technical documentation for the nRF52832 SoC
• EagleCAD PCB files on GitHub

MyNewt Bootloader

This is if you want to program in MyNewt support - the bootloader will not work with Arduino!

You can use adalink and a jlink to program this in via SWD to address 0 with something like:

adalink -v nrf52832 -p jlink -b feather52_boot_bleuart.bin 0

(Don't forget you may have to erase the chip)

Module Details

The Bluefruit nRF52 Feather uses the MDBT42Q module from Raytac. Details on the module, including FCC and other certifications are available in the document below:

Schematic

Schematic (pre March 16 2018)