void setup() {
pinMode(1, OUTPUT);
pinMode(2, OUTPUT);
pinMode(4, OUTPUT);
pinMode(7, OUTPUT);
}

void loop() {
  digitalWrite(1, HIGH);
  digitalWrite(2,HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(7, HIGH);
  delay(1000);
  digitalWrite(1, LOW);
  digitalWrite(2, LOW);
  digitalWrite(4, LOW);
  digitalWrite(7, LOW);
  delay(1000);
  

}