int ledMerah  = 2;
int ledKuning = 3;
int ledHijau  = 4;

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(ledMerah, OUTPUT);
pinMode(ledKuning, OUTPUT);
pinMode(ledHijau, OUTPUT);
Serial.println("UJI COBA LAMPU");
}

void loop() {
  // put your main code here, to run repeatedly:
if (Serial.available() >0){
  int data =Serial.read();
  Serial.println(data);

  if (data =='1'){
    digitalWrite(ledMerah, HIGH);
  }
  else if(data =='2'){
    digitalWrite(ledKuning, HIGH);
  }
  else if(data =='3'){
    digitalWrite(ledHijau, HIGH);
  }
  else if(data =='4'){
    digitalWrite(ledKuning, LOW);
  }
  else if(data =='5'){
    digitalWrite(ledMerah, LOW);
  }
  else if(data =='6'){
    digitalWrite(ledHijau, LOW);
  }
  else if(data =='9'){
    digitalWrite(ledMerah, HIGH);
    digitalWrite(ledHijau, HIGH);
    digitalWrite(ledKuning, HIGH);
  }
  else if(data =='0'){
    digitalWrite(ledMerah, LOW);
    digitalWrite(ledHijau, LOW);
    digitalWrite(ledKuning, LOW);
  }
}
}