NodeMCU - Led

int Led Pin =2;    // D4 Pin also refereed as pin no2 in Node MCU 

void setup() 

{   

    pinMode(LedPin, OUTPUT);

    Serial.begin(9600);   

}

void loop() {

digitalWrite(LedPin, HIGH); 

delay(1000); 

digitalWrite(LedPin, LOW); 

delay(1000);              

}