void setup() 
{
  // put your setup code here, to run once:
//Serial.begin(9600);

pinMode(12, OUTPUT);
}

void loop() 
{
  // put your main code here, to run repeatedly:
digitalWrite(12, HIGH);
//Serial.println("ON");
delay(500);
digitalWrite(12,LOW);
//Serial.println("OFF");
delay(500);
}