LED Screen library for micro:bit (for "Arduino Core for Nordic Semiconductor nRF5 based boards")
[Arduino Core for Nordic Semiconductor nRF5 based boards (GitHub)]
https://github.com/sandeepmistry/arduino-nRF5
[micro:bit - Arduino (DEKO のアヤシいお部屋)] <- written in Japanese
http://ht-deko.com/arduino/microbit.html