#include <Adafruit_NeoPixel.h>
/*
    Tratto dal sito di Mauro Alfieri
    https://www.mauroalfieri.it/elettronica/neopixel-ring-16led-strandtest.html
*/
 
#define PIN 6

uint8_t wait=50;

Adafruit_NeoPixel strip = Adafruit_NeoPixel(48, 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() {
  
//  strip.setPixelColor(0, strip.Color(0, 0, 0));
//  strip.show();
//  delay(wait);  

  strip.setPixelColor(0, strip.Color(255, 255, 0));
  strip.setPixelColor(4, strip.Color(255, 255, 0));
  strip.setPixelColor(8, strip.Color(255, 255, 0));
  strip.setPixelColor(12, strip.Color(255, 255, 0));

  strip.show();
  delay(wait);  

//  loopit();

//  soundtolight();

  
}

void loopit() {
  for (uint8_t i=0; i<16; i++) {
    strip.setPixelColor(i, strip.Color(0, 200, 0));
    strip.show();
    delay(wait);  

     strip.setPixelColor(i, strip.Color(0, 0, 0));
    strip.show();
    delay(wait);  

  }
}

void soundtolight() {
  int j = 8;
  for (uint8_t i=8; i<16; i++) {
    strip.setPixelColor(i, strip.Color(200,200, 0));
    strip.show();
  
    j = j - 1;
    strip.setPixelColor(j, strip.Color(200,200, 0));
    strip.show();
  
    delay(wait);  

    //strip.setPixelColor(i, strip.Color(0, 0, 0));
    //strip.show();
    //delay(wait);  

  }  
}