#define PIN_TRIG 12
#define PIN_ECHO 11
#define ledPin 10

int hitung,jarak;
bool kondisi;

void setup(){
  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);

}

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

  int duration = pulseIn(PIN_ECHO, HIGH);
  Serial.print("jarak:");
  jarak = duration/58;
  if(jarak>100 && kondisi == 0){
    kondisi=1;
    hitung++;
  }
  if(jarak<100 && kondisi == 1){
    kondisi = 0;

    Serial.print("jarak");
    Serial.print(" Hitung:");
    Serial.println(hitung);

     if (jarak < 50 ) {
        digitalWrite(ledPin, HIGH);
    } else {
        digitalWrite(ledPin, LOW);
    }

    delay(1000);
  }
}