#define PIR_PIN 13
void setup() {
  Serial.begin(9600);
  pinMode(PIR_PIN, INPUT);
  Serial.println("HW-416 PIR warming up..");
  delay(5000);
  // put your setup code here, to run once:

}

void loop() {
  if(digitalRead(PIR_PIN)==HIGH){
    Serial.println("Motion detected!");
  }else{
    Serial.println("no motion");
  }
  delay(500);
  // put your main code here, to run repeatedly:

}