#define LED D0;
// the setup funtion runs once when you press reset and or power the board
void setup() {
  // initialize digital pin LED_BUITIN as an ouput
  pinMode(LED, OUTPUT);
}

  // the loop funtion runs over and over again forever
void loop() {
  digitalWrite(LED, HIGH); 
    // turn the LED on (HIGH is the voltage level)
  delay(1000);
    // wait for a second (this to visualice)
  digitalWrite(LED, LOW); 
    // turn the LED off making the voltage LOW (LOW is the voltage level)
  delay(1000);
    // wait for a second
}