#define BLYNK_TEMPLATE_ID "TMPL6WcgzySEw"
#define BLYNK_TEMPLATE_NAME "Project UAS"
#define BLYNK_AUTH_TOKEN "3EGVpIkdkhKv8GnYI07TGb8zcTZIF6bz"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>

#define TRIG_PIN 2       // Pin trigger sensor ultrasonik
#define ECHO_PIN 15       // Pin echo sensor ultrasonik
#define BUZZER_PIN 4    // Pin untuk buzzer

BlynkTimer timer;

void setupLEDC() {
  ledcSetup(0, 2000, 8); // Channel 0, 2000 Hz, 8-bit resolution
  ledcAttachPin(BUZZER_PIN, 0); // Attach BUZZER_PIN to channel 0
}

void checkDistance() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  long duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.0343 / 2;

  Blynk.virtualWrite(V1, distance);  // Kirim jarak ke Blynk gauge

  if (distance <= 50.0) {
    ledcWrite(0, 125); // Mengaktifkan buzzer
    Blynk.virtualWrite(V4, 255);
    Blynk.virtualWrite(V3, 0);
    Serial.println("Mobil sudah dekat dengan dinding");
  } else {
    ledcWrite(0, 0); // Mematikan buzzer
    Blynk.virtualWrite(V3, 255);
    Blynk.virtualWrite(V4, 0);
    Serial.println("Mobil masih bisa mundur");
  }
}

void setup() {
  Serial.begin(9600);
  setupLEDC(); // Setup LEDC untuk buzzer

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  Blynk.begin(BLYNK_AUTH_TOKEN, "Wokwi-GUEST", ""); // Sesuaikan dengan SSID dan password WiFi Anda

  timer.setInterval(1000L, checkDistance);
}

void loop() {
  Blynk.run();
  timer.run();
}