#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, 200);
  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);
}
}