void setup() {
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  digitalWrite(3,HIGH);
  digitalWrite(4,HIGH);
  digitalWrite(5, HIGH);
}

void loop() { 
  digitalWrite(12, HIGH);
  digitalWrite(3, LOW); 
  delay(2000);
  digitalWrite(3, HIGH);
  digitalWrite (4,LOW);

}