#include <NewPing.h>

#define TRIGGER_PIN 2 // Pin trigger sensor ultrasonik
#define ECHO_PIN 4    // Pin echo sensor ultrasonik
#define BUZZER_PIN 5 // Pin buzzer

NewPing sonar(TRIGGER_PIN, ECHO_PIN);
const int thresholdDistance = 50; // Jarak ambang (50 cm)

void setup() {
  Serial.begin(115200);
  pinMode(BUZZER_PIN, OUTPUT);
}

void loop() {
  unsigned int distance = sonar.ping_cm(); // Membaca jarak dalam sentimeter

  if (distance > 0) {
    Serial.print("Jarak: ");
    Serial.print(distance);
    Serial.println(" cm");

    if (distance > thresholdDistance) {
      // Bunyikan buzzer jika jarak melebihi ambang 50 cm
      digitalWrite(BUZZER_PIN, HIGH);
      delay(500); // Buzzer berbunyi selama 0.5 detik
      digitalWrite(BUZZER_PIN, LOW);
    }
  }

  delay(1000); // Tunggu 1 detik sebelum membaca lagi
}