int led1 = 13, led2=12, led3=11, led4=10, buzzer=9, potpin=A0,value;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);     //untuk komunikasi data dengan pin serial pada kecepatan 9600 bps
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(potpin, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  value = analogRead(potpin);   //ambil data nilai dari potensiometer
  tone(buzzer, value);         //nyalain buzzer dari potensiometer

  //nyalain led dengan potensiometer
  if(value > 100){
    digitalWrite(led4, HIGH);
  }
  else{
    digitalWrite(led4, LOW);
  }
   if(value > 200){
    digitalWrite(led3, HIGH);
  }
  else{
    digitalWrite(led3, LOW);
  }
   if(value > 300){
    digitalWrite(led2, HIGH);
  }
  else{
    digitalWrite(led2, LOW);
  }
   if(value > 400){
    digitalWrite(led1, HIGH);
  }
  else{
    digitalWrite(led1, LOW);
  }
}