ds18b20 esp8266 Blynk2

//Temperature Monitor Using DS18B20 Sensor


#define BLYNK_TEMPLATE_ID "TMPL4qFg9q3eq"
#define BLYNK_TEMPLATE_NAME "Temperature Monitor Using DS18B20 Sensor"
#define BLYNK_AUTH_TOKEN "DKTENB_8VyjHnQZaOyepvM59CcsvNwza"


#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp8266.h>
#include <OneWire.h>
#include <DallasTemperature.h>

#define DS18B20 2    //Connect to GPIO2 pin
OneWire ourWire(DS18B20);
DallasTemperature sensor(&ourWire);

char auth[] = BLYNK_AUTH_TOKEN;


char ssid[] = "HUAWEI P30";  // Enter your wifi name
char pass[] = "145600145600";  // Enter your wifi password

BlynkTimer timer;

void sendSensor()
{
  // Request temperature to all devices on the data line
  sensor.requestTemperatures();

  Serial.print("Celsius temperature: ");
  //We can connect more than one IC on the same data wire. 0 refers to the first IC on the wire
  Serial.print(sensor.getTempCByIndex(0));
  //Serial.print(" - Fahrenheit temperature: ");
  Serial.println(sensor.getTempFByIndex(0));
  int tempC=sensor.getTempCByIndex(0);
  //int tempF=sensor.getTempFByIndex(0);
  delay(500);

  // You can send any value at any time.
  // Please don't send more that 10 values per second.
    Blynk.virtualWrite(V0, tempC);
    //Blynk.virtualWrite(V1, tempF);
    delay(250);
}
void setup()
{

   Serial.begin(9600);
  sensor.begin();

  Blynk.begin(auth, ssid, pass);
  timer.setInterval(100L, sendSensor);

  }

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