int sensorpin=12;
void setup()
{
  Serial.begin(115200);
  pinMode(sensorpin,INPUT);
}
void loop()
{
  bool state=digitalRead(sensorpin);
  if(state==HIGH)
  {
    Serial.println("Motion detected");
  }
  else
  {
    Serial.println("no motion detected");
  }
  delay(1000);
}