Node mcu circuit diagram

 Code:

#define BLYNK_PRINT Serial

#include <ESP8266WiFi.h>

void setup() {

#include <BlynkSimpleEsp8266.h>

  //Set the LED pin as an output pin

  pinMode(D0, OUTPUT);

#define BLYNK_AUTH_TOKEN "" //Enter your blynk auth token

  //Initialize the Blynk library

  Blynk.begin(auth, ssid, pass, "blynk.cloud", 80);

char auth[] = BLYNK_AUTH_TOKEN;

}

char ssid[] = "";//Enter your WIFI name

char pass[] = "";//Enter your WIFI password

void loop() {

  //Run the Blynk library

//Get the button value

  Blynk.run();

BLYNK_WRITE(V0) {

}

  digitalWrite(D0, param.asInt());

}

void setup() {

  //Set the LED pin as an output pin

  pinMode(D0, OUTPUT);

  //Initialize the Blynk library

  Blynk.begin(auth, ssid, pass, "blynk.cloud", 80);

}

void loop() {

  //Run the Blynk library

  Blynk.run();

}