NeoPixels Colors

#include "FastLED.h"

// How many leds in your strip?

#define NUM_LEDS 13

#define DATA_PIN 2

// Define the array of leds

CRGB leds[NUM_LEDS];

void setup() {

 FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);

}

void loop() {

 for (int i = 0; i < NUM_LEDS; i = i + 1)

 {

   leds[i] =   blend( CRGB(255,0,0), CRGB(0,255,0), (i*255)/(NUM_LEDS*255));

 }

  /* leds[0] = blend( CRGB(255,0,0), CRGB(0,255,0), 0);

   leds[1] = blend( CRGB(255,0,0), CRGB(0,255,0), 128);

   leds[2] = blend( CRGB(255,0,0), CRGB(0,255,0), 255);*/

 FastLED.show();

}