/*
Nome: Tiago Costa Conceição
RA: 23337

2 + 3 + 3 + 3 +  7 = 18 => 18 - 15 = 3.
*/
#include <Adafruit_NeoPixel.h>

#define NEO_PIN 8
#define NUM_PIXEL 16 
#define Delay 500

Adafruit_NeoPixel ring( NUM_PIXEL, NEO_PIN, NEO_GRB + NEO_KHZ800 );
#define red ring.Color(160,32,240)

void setup() {
  ring.begin();
  ring.show();
}

void loop() {
  int led_inicial = 3;

  for (int i = 0; i <= NUM_PIXEL / 2; i++) {
    int led_anterior = (led_inicial - i + NUM_PIXEL) % NUM_PIXEL;
    int led_posterior = (led_inicial + i) % NUM_PIXEL;
    
    ring.setPixelColor(led_anterior, red);  
    ring.setPixelColor(led_posterior, red);
    
    ring.show();
    delay(Delay);
  }

  delay(1000);

  // Desligar LED
  for (int i = NUM_PIXEL / 2; i >= 0; i--) {
    int led_anterior = (led_inicial - i + NUM_PIXEL) % NUM_PIXEL;
    int led_posterior = (led_inicial + i) % NUM_PIXEL;
    
    ring.setPixelColor(led_anterior, 0);  
    ring.setPixelColor(led_posterior, 0); 
    
    ring.show();
    delay(Delay);
  }

  delay(1000);
}