#define pinTrig 3 
#define pinEcho 2 
#define pinBuzz 13 
int led = 12;
long waktu, jarak;

void setup() {
 Serial.begin(9600);
 pinMode(12, OUTPUT);
 pinMode(pinBuzz, OUTPUT);
 pinMode(pinTrig, OUTPUT);
 pinMode(pinEcho, INPUT);

}

void loop() {
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(pinBuzz, 100);
  delay (50);
  noTone(pinBuzz);
  delay(400);
  digitalWrite (12, HIGH);
  delay(500);
  digitalWrite (12, LOW);  
}

if (jarak < 200 && jarak >= 150){
  tone(pinBuzz, 200);
  delay (50);
  noTone(pinBuzz);
  delay(300);
    digitalWrite (12, HIGH);
  delay(500);
  digitalWrite (12, LOW);  
}

if (jarak < 150 && jarak >= 100){
  tone(pinBuzz, 300);
  delay (50);
  noTone(pinBuzz);
  delay(200);
    digitalWrite (12, HIGH);
  delay(500);
  digitalWrite (12, LOW);  
}

if (jarak < 100 && jarak >= 50){
  tone(pinBuzz, 400);
  delay (50);
  noTone(pinBuzz);
  delay(200);
  noTone(pinBuzz);
    digitalWrite (12, HIGH);
  delay(500);
  digitalWrite (12, LOW);  
  
}

if (jarak < 50 && jarak >= 0){
  tone(pinBuzz, 500);
  delay (50);
  noTone(pinBuzz);
    digitalWrite (12, HIGH);
  delay(500);
  digitalWrite (12, LOW);  
}

else {
  noTone(pinBuzz);
}

Serial.print(" jarak = ");
Serial.print(jarak);
Serial.println(" Cm ");
delay (50);

}

// pinbuz dengan nilai 100 adalah untuk tinggi rendahnya suara
// (semakin besar angkanya semakin melengking ex 200)