DS18B20 ESP8266

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4); // change to your I2C address and 16, 2 for a 2 line lcd

#include <OneWire.h>
#include <DallasTemperature.h>
#define ONE_WIRE_BUS 14 //D5
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>

/*
// NETWORK: Static IP details...
IPAddress ip(192, 168, 1, 10); // a valid IP on your network
IPAddress gateway(192, 168, 1, 1); //IP of your router / gateway
IPAddress subnet(255, 255, 255, 0); //subnet mask of your network
*/

// Replace with your network credentials
const char* ssid = "YOUR SSID";
const char* password = "YOUR WIFI PASSWORD";
ESP8266WebServer server(80); //instantiate server at port 80 (http port)

String page = "";
String text = "";
double data;


void setup(){
sensors.begin(); // DS18B20
//pinMode(A0, INPUT);
delay(1000);
Serial.begin(115200);

// Static IP Setup Info Here...
//WiFi.config(ip, gateway, subnet);

WiFi.begin(ssid, password); //begin WiFi connection
Serial.println("");

// Wait for connection
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
lcd.init();
lcd.backlight();
lcd.setCursor(5, 2);
lcd.print(WiFi.localIP());

server.on("/data.txt", [](){
text = (String)data;
server.send(200, "text/html", text);
});

server.on("/", [](){
page = "<h1>Sensor to Node MCU Web Server</h1><h1>Temperature:</h1> <h1 id=\"data\">""</h1>\r\n";
page += "<script>\r\n";
page += "var x = setInterval(function() {loadData(\"data.txt\",updateData)}, 1000);\r\n";
page += "function loadData(url, callback){\r\n";
page += "var xhttp = new XMLHttpRequest();\r\n";
page += "xhttp.onreadystatechange = function(){\r\n";
page += " if(this.readyState == 4 && this.status == 200){\r\n";
page += " callback.apply(xhttp);\r\n";
page += " }\r\n";
page += "};\r\n";
page += "xhttp.open(\"GET\", url, true);\r\n";
page += "xhttp.send();\r\n";
page += "}\r\n";
page += "function updateData(){\r\n";
page += " document.getElementById(\"data\").innerHTML = this.responseText;\r\n";
page += "}\r\n";
page += "</script>\r\n";
server.send(200, "text/html", page);
});

 server.begin();
 Serial.println("Web server started!");
}


void loop(){
  sensors.requestTemperatures(); // Send the command to get temperatures
  data = (sensors.getTempFByIndex(0));
  //data = analogRead(A0);
  delay(1000);
  server.handleClient();
}