#define LED 13
void setup() {
  pinMode(LED,OUTPUT); //Configure LED as output
}
// the loop function 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
  digitalWrite(LED,LOW); // turn the LED off by making the voltage LOW
  delay(1000); // wait for a second
}