#include <Adafruit_NeoPixel.h>
/*
    Tratto dal sito di Mauro Alfieri
    https://www.mauroalfieri.it/elettronica/neopixel-ring-16led-strandtest.html

    Modified and Simplified by Hamid
*/
 
#define PIN 6
 
Adafruit_NeoPixel strip = Adafruit_NeoPixel(16, PIN, NEO_GRB + NEO_KHZ800);

// Parameter 1 = number of pixels in strip
// Parameter 2 = Arduino pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
// NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
// NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
// NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
// NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)

// IMPORTANT: To reduce NeoPixel burnout risk, add 1000 uF capacitor across
// pixel power leads, add 300 - 500 Ohm resistor on first pixel's data input
// and minimize distance between Arduino and first pixel.  Avoid connecting
// on a live circuit...if you must, connect GND first.
 
void setup() 
{
  strip.begin();
  strip.show(); // Initialize all pixels to 'off'
}
 
void loop() {
  // Sequenze monocolore
  colorWipe(strip.Color(255, 0, 0), 30); // Red
  colorWipe2(strip.Color(255, 255, 0), 60); // Red
  colorWipe(strip.Color(0, 255, 0), 30); // Green
  colorWipe2(strip.Color(0, 255, 255), 60); // Green 
  colorWipe(strip.Color(0, 0, 255), 30); // Blue
  colorWipe2(strip.Color(255, 0, 255), 60); // Blue

}
 
// Fill the dots one after the other with a color
void colorWipe(uint32_t c, uint8_t wait) {
  for(uint16_t i=0; i<strip.numPixels(); i++) {
    strip.setPixelColor(i, c);
    strip.show();
    delay(wait);
  }
}

void colorWipe2(uint32_t c, uint8_t wait) {
  int n=int(strip.numPixels()/3);
  for(uint16_t i=0; i<n; i++) {
    strip.setPixelColor(i, c);
    strip.setPixelColor(i+n, c);
    strip.setPixelColor(i+2*n, c);
    strip.show();
    delay(wait);
  }
}