#define PIR_PIN 13

void setup() {
  Serial.begin(9600);
  pinMode(PIR_PIN, INPUT);
  Serial.println("HW-416 PIR warming up ...");
  delay(5000);
}

void loop() {
  if(digitalRead(PIR_PIN)==HIGH){
    Serial.println("Motion Detected!");
  }else{
    Serial.println("No Motion");
  }
  delay(500);
  }