Cheap PIR motion sensor from Ebay wiring question

I bought a cheap PIR motion sensor from Ebay and I'm not sure how I should be wiring this thing up. I'm assuming 5v to +, Ground to -, and a digital input pin to "Out". Anyone have any idea if I should use a pullup/pulldown resistor? There is very little info to go along with the sensor, so I'm in the dark.


The sensor will make a vieuw of the room in the first seconds it's powered up.
When there is a detection, it will set it's output pin to LOW.

So a pull up resistor is required.

A simple code like this would give you an alarm over serial

int pirPin = 2; //digital 2

void setup(){
 pinMode(pirPin, INPUT);

void loop(){
  int pirVal = digitalRead(pirPin);

  if(pirVal == LOW){ //was motion detected
    Serial.println("Motion Detected");

The code is from a tutorial on a simular sensor

Perfect that was exactly it.

You're welcome :wink: