prendimos tres leds

void setup() {
  pinMode(1, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);

}

void loop() {
  digitalWrite(1, HIGH);
  delay(3000);
  digitalWrite(1, LOW);
  delay(3000);
  digitalWrite(2, HIGH);
  delay(3000);
  digitalWrite(2, LOW);
  delay(3000);
  digitalWrite(3, HIGH);
  delay(3000);
  digitalWrite(3, LOW);
  delay(3000);
  digitalWrite(1, HIGH);
  digitalWrite(2, HIGH);
  digitalWrite(3, HIGH);
  delay(3000);
  digitalWrite(1, LOW);
  digitalWrite(2, LOW);
  digitalWrite(3, LOW);
  delay(3000);
  digitalWrite(3, HIGH);
  delay(3000);
  digitalWrite(3, LOW);
  delay(3000);
  digitalWrite(2, HIGH);
  delay(3000);
  digitalWrite(2, LOW);
  delay(3000);
  digitalWrite(1, HIGH);
  delay(3000);
  digitalWrite(1, LOW);
  delay(3000);
  digitalWrite(1, HIGH);
  digitalWrite(2, HIGH);
  digitalWrite(3, HIGH);
  delay(3000);
  digitalWrite(1, LOW);
  digitalWrite(2, LOW);
  digitalWrite(3, LOW);
  delay(3000);


}

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