#include <Arduino.h>
#include <BlynkSimpleEsp8266.h> // Include the Blynk library for ESP8266

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

char auth[] = "YourAuthToken"; // Your Blynk authentication token

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

  Blynk.begin(auth); // Connect to the Blynk server
}

void loop() {
  Blynk.run(); // Allow Blynk to process incoming commands

  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);
  } else {
    noTone(BUZZER_PIN);
  }

  delay(100);
}