// Pin 6 has an LED connected on most Arduino boards.

// give it a name:

int led = 6;

 

// 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(500);                 // wait for a half second

  digitalWrite(led, LOW);     // turn the LED off by making the voltage LOW

  delay(500);                 // wait for a half second

}