int ledp=21;
int ledv=33;
int ledb=32;

void setup() {
  pinMode(ledp, OUTPUT);
  pinMode(ledv, OUTPUT);
  pinMode(ledb, OUTPUT);
  Serial.begin(115200);
}
void loop() {
  //Etape 1:
  digitalWrite(ledp, HIGH);
  digitalWrite(ledv, HIGH);
  digitalWrite(ledb, LOW);
  delay(1000);
  digitalWrite(ledp, LOW);
  digitalWrite(ledv, LOW);
  digitalWrite(ledb, LOW);

  delay(2000);

  //Etape 2:
  int pins[]={ledp, ledv, ledb};

  for(int i=0;i<4;i++) {
    digitalWrite(pins[i], HIGH);
    delay(200);
  }
  delay(1000);
  
  for(int i=3;i>0;i--) {
    digitalWrite(pins[i], LOW);
    delay(200);
  }

  delay(5000);
  
  //Etape 3:
  for(int i=0;i<4;i++) {
    digitalWrite(pins[i], HIGH);
    delay(3000);
    digitalWrite(pins[i], LOW);
  }

  delay(5000);
}