#define merah 7
#define kuning 6
#define hijau 5
#define biru 4
#define jeda 500

void setup() {
  pinMode(7, OUTPUT);  //set menjadi output 
  pinMode(5, OUTPUT);  //set menjadi output 
  pinMode(4, OUTPUT);   //set menjadi output 
  pinMode(6, OUTPUT); //set menjadi output
}

void loop() {
  nyalaMerah();
  nyalaKuning();
  nyalaHijau();
  nyalaBiru();
}

void nyalaKuning() {
  digitalWrite(6, HIGH); 
  digitalWrite(4, LOW); 
  digitalWrite(5, LOW); 
  digitalWrite(7, LOW); 
  delay(500); 
}
void nyalaBiru() {
  digitalWrite(6, LOW); 
  digitalWrite(4, HIGH); 
  digitalWrite(5, LOW); 
  digitalWrite(7, LOW); 
  delay(500); 
}
void nyalaHijau() {
  digitalWrite(6, LOW); 
  digitalWrite(4, LOW); 
  digitalWrite(5, HIGH); 
  digitalWrite(7, LOW); 
  delay(500); 
}
void nyalaMerah() {
  digitalWrite(6, LOW); 
  digitalWrite(4, LOW); 
  digitalWrite(5, LOW); 
  digitalWrite(7, HIGH); 
  delay(500);
}