#define merah 3
#define kuning 7
#define hijau 10

void setup() {

  // put your setup code here, to run once:
 pinMode(merah, OUTPUT);
 pinMode(kuning, OUTPUT);
 pinMode(hijau, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
delay(2000);
digitalWrite(merah, HIGH);
delay(2000);
digitalWrite(merah, LOW);
delay(2000);
digitalWrite(kuning, HIGH);
delay(2000);
digitalWrite(kuning, LOW);
delay(2000);
digitalWrite(hijau, HIGH);
delay(2000);
digitalWrite(hijau, LOW);
}