#define trigPin 3
#define echoPin 2
#define buzz 4
int duration, distance;
int time;

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

void loop() {
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distance = 0.034 * duration / 2;

  Serial.print("jarak: ");
  Serial.print(distance);
  Serial.println("  cm");
  delay(200);


  time = map(distance, 0, 30, 50, 1000);

  if (distance <= 30) {
    tone(buzz, 500);
    delay(time);
    noTone(buzz);
  }
  if (distance < 10) {
    tone(buzz, 500);
    delay(50);
    
  }
  else{
     noTone(buzz);
  }
  
}