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
- Hardware Design Files: EagleCAD files for the nRF52840 Feather Express on Github.
Additionally, key technical details on the nRF52840 can be found in the nRF52840 Product Specification from Nordic Semiconductors:
The Bluefruit nRF52840 Feather Express uses the MDBT50Q module from Raytac. Details on the module, including FCC and other certifications are available in the document below:
The board files are available on Github, and the board has the following physical layout: