Untitled

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

const char* ssid = "Be Happy";
const char* password = "1234567890";

ESP8266WebServer server(80);
String page = "";
int data, data1;
int counter;
int currentState = 0;
int previousState = 0;
String data2 = "NULL";
void setup() {
  pinMode(D2, INPUT);
  pinMode(D3, INPUT);
  Wire.begin(2, 0);
  lcd.init();
  lcd.backlight();
  lcd.print("Pulse Counter");
  delay(1000);
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  Serial.println("");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Connected to ");
  lcd.setCursor(0, 1);
  lcd.print(ssid);
  delay(1000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("IP address: ");
  lcd.setCursor(0, 1);
  lcd.print(WiFi.localIP());
  delay(1000);
    if (data1==1)
     data2 = "ON";
   if (data1 ==0)
      data2 = "OFF";
  server.on("/", []() {
    page = "<h1>Unit-II</h1><h2>Status:</h2> <h4>" + data2 + "</h4><h3>Pulse:</h3> <h4>" + String(counter) + "</h4><script>location.reload();</script>";
    server.send(200, "text/html", page);
  });
  server.begin();
  Serial.println("Web server started!");
}

void loop() {
  data1 = digitalRead(D3);
  data = digitalRead(D2);
  if (data1 == HIGH) {
    if (data == HIGH) {
      currentState = 1;
    }
    else {
      currentState = 0;
    }
    if (currentState != previousState) {
      if (currentState == 1) {
        counter = counter + 1;
        Serial.print("Unit-II ");
        Serial.println("ON");
        Serial.print("Pulse= ");
        Serial.println(counter);
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Unit-II");
        lcd.setCursor(9, 0);
        lcd.print("ON");
        lcd.clear();
        lcd.setCursor(0, 1);
        lcd.print("Pulse= ");
        lcd.setCursor(7, 1);
        lcd.print(counter);
      }
    }
    previousState = currentState;
  }
  else {
    Serial.print("Unit-II ");
    Serial.println("OFF");
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Unit-II ");
    lcd.setCursor(9, 1);
    lcd.print("OFF");
  }
  server.handleClient();
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="stylesheet.css">
    <title>Machine Data</title>
</head>
<body>
    <iframe src="http://192.168.43.XXX">
        </iframe>
    <iframe src="http://192.168.43.XXX">
        </iframe>
</body>
</html>