#define LEDMERAH 13
#define LEDKUNING 8
#define LEDHIJAU 5

void setup() {
  pinMode(LEDMERAH, OUTPUT);
  pinMode(LEDKUNING, OUTPUT);
  pinMode(LEDHIJAU, OUTPUT);
  // Declare the LED as an output
  digitalWrite(LEDMERAH, LOW); 
  digitalWrite(LEDKUNING, LOW);
  digitalWrite(LEDHIJAU, LOW);
}

void loop() {
  digitalWrite(LEDMERAH, HIGH); 
  digitalWrite(LEDKUNING, LOW); 
  digitalWrite(LEDHIJAU, LOW); 
  delay(3000);
  digitalWrite(LEDMERAH, LOW); 
  digitalWrite(LEDKUNING, HIGH); 
  delay(3000);
  digitalWrite(LEDKUNING, LOW); 
  digitalWrite(LEDHIJAU, HIGH); 
  delay(3000);
}