void setup() {
  // initialize digital pin 0 as an output.
  pinMode(0, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(0, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(100);             // wait for a second
  digitalWrite(0, LOW);    // turn the LED off by making the voltage LOW
  delay(100);             // wait for a second
}