Hi. I want to build christmas tree with led and powered by ATmega2560.

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Hi. I want to build christmas tree with led and powered by ATmega2560. Please help me for instruction from the beginning to to the last step
I also need the script/code for my arduino.

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Hello, if you like blinky leds you’ve come to the right place! What have you done so far?

Have you read the FastLED wiki? https://github.com/FastLED/FastLED/wiki/Frequently-Asked-Questions

What type of LEDs do you have?

Have you installed the FastLED library and looked at the code examples?