//Rifki Haitami Ramadhan 
//Mendeteksi Benda dengan Sensor Ultrasonic

#define TRIG_PIN 19  
#define ECHO_PIN 18 
#define LED_PIN 4   

void setup() {
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  Serial.begin(115200);
}

void loop() {
  long duration;
  float distance;

  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  duration = pulseIn(ECHO_PIN, HIGH);
  if (duration == 0) { 
    Serial.println("Tidak ada sinyal, periksa sensor!");
    return; 
  } 

  distance = (duration * 0.0343) / 2; 

  Serial.print("Jarak: 10 cm ");
  Serial.print(distance);
  Serial.println(" 10 cm ");

  if (distance > 0 && distance < 10) { 
    digitalWrite(LED_PIN, LOW); // LED menyala  jika jarak >= 10 cm 
  } else {
    digitalWrite(LED_PIN, HIGH);   // LED mati jika jarak >= 10 cm
  }

  delay(500); // Delay untuk stabilitas
}