#include <Adafruit_NeoPixel.h>

int pixel_pin = 21;
int pixel_qnt = 16;

int pin_led = 13;

Adafruit_NeoPixel stripe = Adafruit_NeoPixel(pixel_qnt, pixel_pin, NEO_GRB + NEO_KHZ800);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  stripe.begin();

  pinMode(pin_led, OUTPUT);
  Serial.println("Setup completed!");
}

void loop() {

  stripe.setPixelColor(0, stripe.Color(255, 0, 0));
  delay(500);
  stripe.show();
  stripe.setPixelColor(0, stripe.Color(0, 0, 0));
  delay(500);
  stripe.show();
}//loop