void setup() {
  // put your setup code here, to run once:
  pinMode(2, OUTPUT);
//Qual é pino e o Modo 
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(2, HIGH);
  delay(1000); //1 seg = 1000 mili
  digitalWrite(2, LOW);
  delay(1000);

}