void setup() {

int LEDMERAH=13;
int LEDKUNING=12;
int LEDHIJAU=4;
int LEDBIRU=3;
} 

void loop() {

pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(4, OUTPUT);
pinMode(3, OUTPUT);

digitalWrite(13, HIGH);
digitalWrite(12, LOW);
digitalWrite(4, LOW);
digitalWrite(3, LOW);
delay(1000);

digitalWrite(13, LOW);
digitalWrite(12, HIGH);
digitalWrite(4, LOW);
digitalWrite(3, LOW);
delay(1000);

digitalWrite(13, LOW);
digitalWrite(12, LOW);
digitalWrite(4, HIGH);
digitalWrite(3, LOW);
delay(1000);

digitalWrite(13, LOW);
digitalWrite(12, LOW);
digitalWrite(4, LOW);
digitalWrite(3, HIGH);
delay(1000);



}