Codigo (reto 1)

void setup() {
  pinMode(2, OUTPUT);

}

void loop() {
  digitalWrite(2, HIGH);
  delay(3000);
  digitalWrite(2,LOW);
  delay(1000);
  digitalWrite(2, HIGH);
  delay(2000);
  digitalWrite(2,LOW);
  delay(500);
  digitalWrite(2, HIGH);
  delay(1000);
  digitalWrite(2,LOW);
  delay(250);
}