#define BLYNK_TEMPLATE_ID "TMPL3kElqgLWB"
#define BLYNK_TEMPLATE_NAME "VR navigation assistant"
#define BLYNK_AUTH_TOKEN "t4WJtzQC1bz46eIgdQmiIZn0Sl58Z1hV"
#define BLYNK_PRINT Serial

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

#define TRIG_PIN 12
#define ECHO_PIN 13
#define BUZZER_PIN 14

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

BlynkTimer timer;

void setup() {
  Serial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  
  Blynk.begin(auth, ssid, pass);
}

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

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

  long duration = pulseIn(ECHO_PIN, HIGH);
  long distance = duration * 0.034 / 2;

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  if (distance < 50) {
    tone(BUZZER_PIN, 1000);
    delay(1000);
  } else {
    noTone(BUZZER_PIN);
    delay(1000);
  }
  delay(100);
}