Installation Instructions
To add board Community nRF52 board support, start Arduino and open the Preferences window (File > Preferences). Now copy and paste the following 2 URLs into the 'Additional Boards Manager URLs' input field:
https://www.adafruit.com/package_adafruit_index.json
https://github.com/jpconstantineau/Community_nRF52_Arduino/releases/latest/download/package_jpconstantineau_boards_index.json
If there is already an URL from another manufacturer in that field, click the button at the right end of the field. This will open an editing window allowing you to paste the above URL onto a new line.
When installing nRF52 boards, you will need to first install Adafruit nRF52 support, then Community add-on nRF52 boards.
Open the Boards Manager window by selecting Tools > Board, scroll to the top of the board list, and select Boards Manager. Now type "nrf52" (without quotes) into the "filter your search" field at the top of the window. multiple entries should show up, one with Adafruit nrf52 boards, and one with Community Add on Adafruit nrf52 boards. We'll install both of these, starting with Adafruit nrf52 boards.
Click anywhere in the "Adafruit nrf52 boards" box, and click "Install". This is a large installation and will take a while.
Now click anywhere in the "Community Add on Adafruit nrf52 boards" box, and click "Install". This is a small installation and will happen much faster.
You're now ready to use the Community Add-on to Adafruit nrf52 boards. They will appear at the bottom of the board list.