Green-Red-White LED Pattern for Tree

WhiteGreenRed_GradientPaletteFade.ino

//See https://github.com/s-marley/FastLED-basics/blob/main/3.%20Palettes/blueGradientPal/blueGradientPal.ino
#include <FastLED.h>

#define NUM_LEDS 200
#define LED_PIN 10

CRGB leds[NUM_LEDS];

//uint8_t paletteIndex = 0;
uint8_t colorIndex[NUM_LEDS];

DEFINE_GRADIENT_PALETTE( christmas_gp ) {
  0, 255, 0, 0,
  100, 255, 200, 50,
  126, 0, 255, 0,
  191, 255, 200, 50,
  220, 255, 0, 0,
  255, 255, 0, 0,
};

CRGBPalette16 myPal = christmas_gp;



void setup() {
  FastLED.addLeds<WS2812B, LED_PIN, RGB>(leds, NUM_LEDS);
  FastLED.setBrightness(20);

  for (int i = 0; i < NUM_LEDS; i++) {
    colorIndex[i] = random8();
  }
}

void loop() {
   for (int i = 0; i < NUM_LEDS; i++) {
    leds[i] = ColorFromPalette(myPal, colorIndex[i]);
  }

  EVERY_N_MILLISECONDS(20) {
    for (int i = 0; i < NUM_LEDS; i++) {
      colorIndex[i]++;
    }
  }
//  fadeToBlackBy(leds, NUM_LEDS, 1);
  FastLED.show(); 
}