/*
 Blink
 
 Turns on an LED on for one second, then off for one second, repeatedly.
 
 The circuit:
 LED connected from digital pin 13 to ground.
 */

int ledPin =  13;    // LED connected to digital pin 13

void setup()   {                
  // initialize the digital pin as an output:
pinMode(ledPin, OUTPUT);     
}


void loop()                     
{
  digitalWrite(ledPin, HIGH);   // set the LED on
  delay(1000);                  // wait for a second
  digitalWrite(ledPin, LOW);    // set the LED off
  delay(1000);                  // wait for a second
}