int estadoled;

void setup() {
  // put your setup code here, to run once:
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  estadoled = 1;
}

void loop() {
  // put your main code here, to run repeatedly:
  limpio();
  if(estadoled == 1) {
    digitalWrite(2, HIGH);
    delay(5000);
  }
  if(estadoled == 2) {
    digitalWrite(3, HIGH);
    delay(2000);
  }
  if(estadoled == 3) {
    digitalWrite(4, HIGH);
    delay(5000);
  }
  estadoled = estadoled+1;
  if(estadoled == 4) {
    estadoled = 1;
  }
}

void limpio() {
  digitalWrite(2, LOW);
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);
}