void setup() { 
  // Initialize the built-in LED pin as an output
  pinMode(7, OUTPUT);
  pinMode(4, OUTPUT);
}

void loop() { // Berulang ulang
  // Turn the LED on
  digitalWrite(7, HIGH); 
  digitalWrite(4, HIGH); 

  // Wait for a second (1000 milliseconds)
  delay(1000);                     

  // Turn the LED off
  digitalWrite(7, LOW);  
  digitalWrite(4, LOW);  

  // Wait for a second
  delay(1000);                     
}