int pirPin = 2;       
int ledPin = 13;      

void setup() {
  pinMode(pirPin, INPUT);
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int motion = digitalRead(pirPin);
  if (motion == HIGH) {
    digitalWrite(ledPin, HIGH);  
    Serial.println("wow!");
  } else {
    digitalWrite(ledPin, LOW);  
    Serial.println("no");
  }
  delay(300
  );
}