#define pinTrig 3
#define pinEcho 2
#define pinBuzz 13

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<200 && jarak >=1){
  tone(pinBuzz,200);
  delay(100);
  noTone(pinBuzz);
  digitalWrite(12, HIGH);
}

else{
  noTone(pinBuzz);
  digitalWrite(12, LOW);
}
}