//A blinking LED on digital IO pin 12
//plug an led with the long leg in pin 12 and the short leg in the GND pin

void setup()        
{
  pinMode(12,OUTPUT);    //set pin 12 to be an output
}

void loop() 
{
  digitalWrite(12,HIGH);      //set pin 12 to be HIGH or 5V
  delay(1000);                //wait 1 second
  digitalWrite(12,LOW);       //set pin 12 to be LOW / Ground / 0V.
  delay(1000);                //wait 1 second

}