int pir = 2;
int a =14;

void setup()
{
  pinMode(pir, INPUT);
  Serial.begin(115200);
}
void loop()
{
  a = digitalRead(pir);
  Serial.println(a);

  if(a==HIGH)
  {
    Serial.println("kit kat");
    delay(100);
  }

   if(a==LOW)
  {
    Serial.println("kit kat");
    delay(100);
  }
}