#define LEDMerah 2
#define LEDKuning 4
#define LEDHijau  7

void setup() {
  // put your setup code here, to run once:
pinMode (LEDMerah, OUTPUT );
pinMode (LEDKuning, OUTPUT );
pinMode (LEDHijau, OUTPUT );
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite (LEDMerah,LOW  );
digitalWrite (LEDKuning, HIGH );
digitalWrite (LEDHijau,LOW  );
delay (1000);
digitalWrite (LEDMerah, HIGH  );
digitalWrite (LEDKuning, LOW );
digitalWrite (LEDHijau, LOW );
delay (3000);
digitalWrite (LEDMerah, LOW );
digitalWrite (LEDKuning, HIGH );
digitalWrite (LEDHijau, LOW );
delay (1000);
digitalWrite (LEDMerah, LOW  );
digitalWrite (LEDKuning,LOW   );
digitalWrite (LEDHijau, HIGH  );
delay (3000);
}