int merah1 =10;   
int kuning1 =9;
int hijau1 =8;
int merah2 =5;
int kuning2 =4;
int hijau2 =3;

void setup() {
  // put your setup code here, to run once:
pinMode(merah1, OUTPUT);
pinMode(kuning1, OUTPUT);
pinMode(hijau1, OUTPUT);
pinMode(merah2, OUTPUT);
pinMode(kuning2, OUTPUT);
pinMode(hijau2, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(merah1, HIGH);
delay(2000);

digitalWrite(merah1, LOW);
digitalWrite(kuning1, HIGH);
delay(1000);

digitalWrite(kuning1, LOW);
digitalWrite(hijau1,HIGH);
delay(2000);

digitalWrite(hijau1, LOW);

digitalWrite(merah2, HIGH);
delay(2000);

digitalWrite(merah2, LOW);
digitalWrite(kuning2, HIGH);
delay(1000);

digitalWrite(kuning2, LOW);
digitalWrite(hijau2, HIGH);
delay(2000);

digitalWrite(hijau2, LOW);
}