#include <FastLED.h>

#define LED_PIN     2
#define NUM_LEDS    12
#define BRIGHTNESS  50

CRGB leds[NUM_LEDS];

DEFINE_GRADIENT_PALETTE(SunsetPal) {
  0, 120,  0,  0,
  22, 179, 22,  0,
  51, 255,104,  0,
  85, 167, 22, 18,
  135, 100,  0,103,
  198,  16,  0,130,
  255,   0,  0,160};

CRGBPalette16 Sunset = SunsetPal;

float progress = 0;

void setup() {
  FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);
  FastLED.setBrightness(BRIGHTNESS);
Serial.begin(9600);

}

void loop() {

  uint8_t colorIndex = (progress * 255);
  CRGB currentcolor = ColorFromPalette(Sunset, colorIndex);

increaseprogress();

fill_solid(leds, NUM_LEDS, currentcolor);

Serial.println(colorIndex);

FastLED.show();
}

void increaseprogress() {
  progress += 0.01;
    if (progress > 1.0) {
        progress = 1.0;
    }
delay(100);
}