int rele = 2;
int rele2 = 3;
int rele3 = 4;

void setup() {

  pinMode(rele,OUTPUT);
  pinMode(rele2,OUTPUT);  
  pinMode(rele3,OUTPUT);

}

void loop() {
  
  digitalWrite(rele, HIGH);
  digitalWrite(rele2, LOW);
  digitalWrite(rele3, LOW);
  delay(5000);
  digitalWrite(rele, LOW);
  digitalWrite(rele2, HIGH);
  digitalWrite(rele3, LOW);
  delay(2000);

  digitalWrite(rele, LOW);
  digitalWrite(rele2, LOW);
  digitalWrite(rele3, HIGH);
  delay(4000);

}