Christmas tree LED control by Arduino Nano
FadeLed lib https://github.com/septillion-git/FadeLed
Install fadeLED before you start.
Make a tree whatever you like. e.g. 3D printed/Cardboard/Reuse cereal box
Connect LED(positive/long) to pin 3,5,6,9,10,11 The other LED pin(Negative/short) should connect to GND via 220ohm resister.
Adjust resister value for LEDs.
Connect LED(positive) to pin 12 The other LED pin(Negative) should connect to GND via 220ohm resister.
Adjust resister value for the LED.