0.1:

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(2,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(2,High);
  delay(1000);
  digitalWrite(2,Low);
  delay(1000);
  Serial.println("Hello LED");
}