void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(13,OUTPUT);
}
  // the loop function runs over and over again forever
void loop() {
digitalWrite(13, HIGH); //turn the LED on (HIGH is the voltage)
delay(5000);                     //wait for a second  
digitalWrite(13,LOW);//turn the LED off by making the voltage 
delay(10000);                    //wait for a second                  
}