#define pinTrig  3
#define pinEcho  2
#define pinBuz  13

long waktu, jarak;

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(pinBuz, OUTPUT);
pinMode(pinTrig,OUTPUT);
pinMode(pinEcho,INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite (pinTrig, LOW);
  delayMicroseconds(2);
  digitalWrite (pinTrig, HIGH);
  delayMicroseconds(10);
  digitalWrite (pinTrig, LOW);
  
  waktu = pulseIn (pinEcho,HIGH);
  jarak = waktu / 58.2;

  if (jarak < 250 && jarak >= 200){
    tone (pinBuz, 100);
    delay (50);
    noTone (pinBuz);
    delay (200);
  }

if (jarak < 200 && jarak >= 150){
tone(pinBuz, 200);
delay (50);
noTone (pinBuz);
delay (150);
}

if (jarak < 150 && jarak >= 100){
tone (pinBuz,300);
delay (50);
noTone (pinBuz);
delay (100);
}

if (jarak < 100 && jarak >= 50){
tone (pinBuz,400);
delay (50);
noTone (pinBuz);
delay (50);
}

if (jarak < 50 && jarak >= 2){
  tone (pinBuz, 500);
  delay (50);
  noTone (pinBuz);
}

else {
  noTone (pinBuz);
}
}