int echoPin = 9;
int trigPin = 8;
int ledPin = 13;
int buzzPin = 12;
int jarakDekat = 10;
long duration;
long distance;

String maju1 = "Ayo maju terus, objek masih sejauh ";
String maju2 = " cm";
String stopA = "STOP! Objek sudah dekat!";

void setup() {
  Serial.begin (9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzPin, OUTPUT);
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);

  distance = duration/58.2;

  if (distance <= jarakDekat){
    Serial.println(stopA);
    digitalWrite(ledPin, HIGH);
    tone(buzzPin, 1000);
    delay(1000);
  } else {
    Serial.println(maju1 + distance + maju2);
    digitalWrite(ledPin, LOW);
    noTone(buzzPin);
    delay(1000);
  }
}