I actually just created this excel utility to help create some cool animations for a halloween costume... It just generates the function calls to set the bytes properly in the LED array. Here's the links mentioned:

Original how-to video on the WS2812:
   • Easy Addressable LEDs with Arduino! W...  

Then something in the Arduino Core broke that sketch, so I fixed it in this video:
   • Updating Arduino Broke my Code!! FAIL  

The Excel file I used:
https://kevindarrah.com/download/ardu...

The CODE:
https://kevindarrah.com/download/ardu...

That 328 board for the costume here: https://www.tindie.com/products/14948/

Check out my Tindie store (trigBoard is available) https://www.tindie.com/stores/kdcircu...

Thanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen!
  / kdarrah  

Twitter:   / kdcircuits  

For inquiries or design services:
https://www.kdcircuits.com