What that blinking LED?

At first power on I saw a blinking led on Arduino board and got immediately worried about it! I rushed to the internet and after some surfing I found the answer. In most boards sold over the internet, Arduino come with a pre-loaded program which is "Blink". The program can be found in the examples provided with the Arduino IDE, I report it below. Just upload another program to get the LED stopped.

/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.
 
  This example code is in the public domain.
 */
 
// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led = 13;

// the setup routine runs once when you press reset:
void setup() {               
  // initialize the digital pin as an output.
  pinMode(led, OUTPUT);    
}

// the loop routine runs over and over again forever:
void loop() {
  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);               // wait for a second
  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);               // wait for a second
}

This was the first experience hopefully the next ones will be less threatening and more exciting ;-)