// Define the pin to which the LED is connected
const int ledPin = D0;

void setup() {
  // Set the LED pin as an OUTPUT
  pinMode(ledPin, OUTPUT);
}

void loop() {

  
  // Turn on the LED
  digitalWrite(ledPin, HIGH);

  // Wait for a moment (in milliseconds)
  delay(1000);

  // Turn off the LED
  digitalWrite(ledPin, LOW);

  // Wait for another moment
  delay(1000);
}