int a = 12;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(a, OUTPUT);
  
}

void loop() {

  digitalWrite(a, HIGH);
  delay(2000);
  Serial.println("LED ON");
  digitalWrite(a, LOW);
  Serial.println("LED OFF");
  delay(2000);
  // put your main code here, to run repeatedly:
 // this speeds up the simulation
}