One of our goals with making a great open-source platforms is for not only the community to learn from, use, and extend them, but other companies that also do open-source hardware and software to use and extend. We are thrilled to see CircuitPython on the SparkFun Pro nRF52840 Mini – Bluetooth Development Board – DEV-15025.
The board comes pre-programmed with a USB bootloader. You can develop programs for the nRF52840’s Cortex-M4 using either Arduino, Circuit Python, or C (using Nordic’s nRF5 SDK), and load that compiled code using a USB serial or mass-storage interface.
Check out the nRF52840 Development with Arduino and CircuitPython guide and it’s worth noting a lot of the advances in development for dev boards is a result of the open-source uf2 bootloader (thanks Microsoft!) and the Arduino core is also from Adafruit.
Bootloader Credits
The bootloader that ships on this board is heavily based on Adafruit’s nRF52 Bootloader. This is an extremely well-designed UF2, CDC, and DFU bootloader that provides extensive bootloading support to Nordic’s nRF52 (nRF52840 and nRF52832) products.
Yay!
The Adafruit Feather nRF52840 will be shipping soon we’ve previewed it a few times on our weekly show and Python on hardware newsletter (sign up!), we have some changes to the software and some final testing on the hardware we do first, expect it in the Adafruit store soon 
It’s never been a better time to jump in to the Code + Community … CircuitPython! Join us and 9,000+ other humans, on discord in the CircuitPython channel! https://adafru.it/discord
