int pinled1 = 23;
int pinled2 = 22;
int pinled3 = 21;
int BOUTON = 18;

void setup() {
  pinMode(pinled1, OUTPUT);
  pinMode(pinled2, OUTPUT);
  pinMode(pinled3, OUTPUT);
  pinMode(BOUTON, INPUT);
}

void loop() {

  if ( digitalRead(BOUTON)==HIGH){
  digitalWrite(pinled1, HIGH); 
  delay(3000);
  digitalWrite(pinled2, HIGH); 
  delay(1000);
  digitalWrite(pinled3, HIGH); 
  delay(2000);

  }else{
 
  digitalWrite(pinled1, LOW);
  digitalWrite(pinled2, LOW);
  digitalWrite(pinled3, LOW);

  }
}