#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <BlynkSimpleEsp8266.h>
#include <NewPing.h>

// Replace with your WiFi credentials
char auth[] = "YourAuthToken";
char ssid[] = "YourWiFiSSID";
char pass[] = "YourWiFiPassword";

// Virtual PINs on Blynk app
#define VIRTUAL_DISTANCE_PIN V1

// Define LCD address and dimensions
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Define sensor pins
#define TRIGGER_PIN 2
#define ECHO_PIN 3
#define MAX_DISTANCE 200

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);

void setup() {
  Serial.begin(115200);

  // Initialize LCD
  lcd.begin(16, 2);
  lcd.backlight();

  // Connect to WiFi
  Blynk.begin(auth, ssid, pass);
}

void loop() {
  Blynk.run();

  // Read distance from HC-SR04
  delay(50);
  unsigned int distance = sonar.ping_cm();

  // Display distance on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Distance: ");
  lcd.print(distance);
  lcd.print(" cm");

  // Send distance to Blynk
  Blynk.virtualWrite(VIRTUAL_DISTANCE_PIN, distance);

  delay(1000);
}