Neopixel LED Ring & Strip  Arduino controlled by Bluetooth from Android or iphone
Learn how to control data LED by Using Your Smart phone.

 RGB LED Ring: US :  https://amzn.to/2IMCgyK   UK : https://amzn.to/2kq3lJl 
MAX7219 Module DIY kit: US :  https://amzn.to/2GOL2Gp...