Programmable Christmas Tree Lights

Christmas tree lights based on an Arduino and addressable RGB LEDs with embedded WS2811s. This allows you to program virtually any pattern you can think of, and the LEDs can be replaced if any fail. Unlike traditional fairy lights, the failure of any single LED will not cause the others to get a higher voltage and fail as well - it may cause a break in the circuit but you will know exactly where it is and you can repair it.

2 pieces are 3D printed:
the box+lid for the controller
the individual LED holders+covers - one for each LED

Electronic parts needed:
some addressable LEDs (I used 40) https://www.pololu.com/product/2535
Arduino Uno
220 ohm resistor
390 ohm resistor
2.8k resistor
10k resistor
10 mF capacitor
some stripboard (or any other means of building a circuit) and connecting wire
3-core flexible AWG22 or similar cable (number of LEDs x distance between LEDs + lead from controller to first light)
any pushbutton
16x2 LCD screen (can leave this out if you do