int t = 300;

void setup() {
pinMode(2, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(18, OUTPUT);
pinMode(19, OUTPUT);
}

void loop() {
   digitalWrite(2, HIGH);
      digitalWrite(4, HIGH);
            digitalWrite(5, HIGH);
   digitalWrite(18, HIGH);
      digitalWrite(19, HIGH);
delay(t);
digitalWrite(2, LOW);
digitalWrite(4, LOW);
digitalWrite(5, LOW);
digitalWrite(18, LOW);
digitalWrite(19, LOW);
delay(t);
}