#define PIR_PIN 4

void setup() {
  pinMode(PIR_PIN, INPUT);
  Serial.begin(9600);
}

void loop() {
  int motion = digitalRead(PIR_PIN);
  delay(2000);
  if (motion==HIGH){
    Serial.println("motion detected");
  
  }
  else if (motion==LOW){
    Serial.println("motion NOT detected");
  
  }
}