void setup() {
  Serial.begin(115200);
  pinMode(2, OUTPUT);
  pinMode(3, INPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
}

void loop() {
  //Sensor
  digitalWrite(2, HIGH);
  delayMicroseconds(10);
  digitalWrite(2, LOW);

  //Logic
  int jarak = pulseIn(3, HIGH);
  int cm = jarak / 58;
  Serial.print(cm);
  Serial.println(" cm");

  if (cm <= 100) {
    digitalWrite(4, HIGH);
    digitalWrite(5, LOW);
    digitalWrite(6, LOW);
  }
  else if (cm > 100 && cm <= 200){
    digitalWrite(4, LOW);
    digitalWrite(5, HIGH);
    digitalWrite(6, LOW);
  }
  else {
    digitalWrite(4, LOW);
    digitalWrite(5, LOW);
    digitalWrite(6, HIGH);
  }
}