Seeeduino XIAO IDE

Install Arduino

https://www.arduino.cc/en/software

Add Seeeduino XIAO board support

https://wiki.seeedstudio.com/Seeed_Arduino_Boards/

• Open File > Preferences.
• Add entry to Additional Boards Manager URLs

  https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json
  

• Open Tools > Board _ > Board Manager ...
• Search for Seeed SAMD Boards
• Add

Select the board

Install FastLED library

• Open Sketch > Include Library > Manage Libraries ...
• Search for FastLED
• Install FastLED by Daniel Garcia