void setup() {
  // put your setup code here, to run once:
  pinMode(2, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(2, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(6000);                       // wait for 6 seconds
  digitalWrite(2, LOW);
  delay(6000);       // turn the LED off by making the voltage LOW
}