Arduino sketch for annoying xmas lights (ws2812b)

lights.cpp

#include "Arduino.h"

#include <Adafruit_NeoPixel.h>

#define PIN 4
#define LED_COUNT 60

// Create an instance of the Adafruit_NeoPixel class called "leds".
// That'll be what we refer to from here on...
Adafruit_NeoPixel leds = Adafruit_NeoPixel(LED_COUNT, PIN, NEO_GRB + NEO_KHZ800);

void setup()
{
  leds.begin();  // Call this to start up the LED strip.
}

void lightColor(int pos) {
    if (pos % 6 == 0) {
        leds.setPixelColor(pos, 10, 0, 0);
    } else if (pos % 6 == 1) {
        leds.setPixelColor(pos, 0, 10, 0);
    } else if (pos % 6 == 2) {
        leds.setPixelColor(pos, 0, 0, 10);
    } else if (pos % 6 == 3) {
        leds.setPixelColor(pos, 0, 10, 10);
    } else if (pos % 6 == 4) {
        leds.setPixelColor(pos, 10, 10, 0);
    } else {
        leds.setPixelColor(pos, 10, 0, 10);
    }
}

int l = 0;
int d = 1;
void loop()
{
  // Ride the Rainbow Road
  for (int i=0; i<=LED_COUNT-1; i++) {
        leds.setPixelColor(i, 0, 0, 0);
    }
  for (int i=0; i<=LED_COUNT-1; i++) {
    if ((l+ i)%3== 0)
        lightColor(i);
  }
    leds.show();
    l += d;
    if (l == 0 || l >= LED_COUNT) {
        d *=-1;
    }
    delay(40);
}