/*
  BlinkMe
  Turn an LED on and off once per second.
 */

void setup() {                
  pinMode(13, OUTPUT);       // make pin 13 an output
}

void loop() {
  digitalWrite(13, HIGH);    // turn the LED on (HIGH is the voltage level)
  delay(1000);               // wait one second (1000 milliseconds)
  digitalWrite(13, LOW);     // turn the LED off by making the voltage LOW
  delay(1000);               // wait one second
}