Simple sketch to light up Neopixels

simple_led.ino

#include "FastLED.h"

// How many leds in your strip?
#define NUM_LEDS 60

// For led chips like Neopixels, which have a data line, ground, and power, you just
// need to define DATA_PIN. 
#define DATA_PIN 5

// Define the array of leds
CRGB leds[NUM_LEDS];

void setup() { 
     // Add the LEDs
  	  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
}

void loop() { 
  // Tunn all the LEDs red one by one
  for (int i=0; i < NUM_LEDS; i++){ 
    leds[i] = CRGB::Red;
    FastLED.show();
    delay(500);
  }
  // Tunn all the LEDs blue one by one
  for (int i=NUM_LEDS-1; i < 0; i--){ 
    leds[i] = CRGB::Blue;
    FastLED.show();
    delay(500);
  }
}