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After completed above oprations, try to upload the first sketch to the NodeMCU.

Preparation

Code:

Connect your NodeMCU to the PC and put below code to your Arduino IDE .

void setup()
{
Serial.begin(115200);//Set the baudrate to 115200,same as the software settings
}
void loop()
{
Serial.println("Hello World!");//Print character string“Hello World!”on the serial
delay(5000);// Delay 5 second
}

Choose corresponding board/port for your project,upload the sketch to the board.

boardsettings

After upload down,click Serial Monitor button,you will see the running result as below:

serial monitor

serial monitor result

You will see the serial monitor output every 5 second.

Note: Make sure the baudrate is same as your sketch setting.