void setup() 
{
  Serial.begin(9600);
  pinMode(12, OUTPUT); 
  pinMode(11,OUTPUT);
}

void loop()  
 {
  digitalWrite(12, HIGH);
  Serial.println("LED_ON");
  delay(2000);
  digitalWrite(11, HIGH);
  Serial.println("LED on");
  delay(1000);
  
   digitalWrite(12,LOW);  
   Serial.println("LED OFF");
   delay(2000);
 }