#include <Adafruit_NeoPixel.h>

#define LED_PIN 33
#define NUM_LEDS 4

Adafruit_NeoPixel pixel(NUM_LEDS, LED_PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  pixel.begin();
}

void loop() {

  // ===== LED 0 =====
  pixel.clear(); // apaga todos
  pixel.setPixelColor(0, pixel.Color(255, 0, 0)); // vermelho
  pixel.show();
  delay(500);

  // ===== LED 1 =====
  pixel.clear();
  pixel.setPixelColor(1, pixel.Color(0, 255, 0)); // verde
  pixel.show();
  delay(500);

  // ===== LED 2 =====
  pixel.clear();
  pixel.setPixelColor(2, pixel.Color(0, 0, 255)); // azul
  pixel.show();
  delay(500);

  // ===== LED 3 =====
  pixel.clear();
  pixel.setPixelColor(3, pixel.Color(255, 255, 0)); // amarelo
  pixel.show();
  delay(500);
}