Note: sample code under the Sample code folder
// 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);
delay(1000); // wait for a second
digitalWrite(led, LOW);
delay(1000);
}