Easy led blink

1
2// the setup function runs once when you press reset or power the  board
3void setup() {
4  // initialize digital pin 13 as an output.
5  pinMode(13,  OUTPUT);
6}
7
8// the loop function runs over and over again forever
9void  loop() {
10  digitalWrite(13, HIGH);
11  delay(1000);                      
12  digitalWrite(13, LOW);   
13  delay(500);                       
14}