Connect

• 3.3V with Vin (left)
• D2 with Data (middle)
• GND with GND (right)

then paste this code to your Arduino IDE and upload it to the connected NodeMCU:

int oldValue = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(D2, INPUT_PULLUP);
  Serial.begin(115200);

}

void loop() {
  int value = digitalRead(D2);
  if (value != oldValue) {
    Serial.println("New Value: " + String(value));
    oldValue = value;
    if (value == 1) {
      Serial.println("##########################");
    }
  }
  delay(100);
}

 

Open the serial console and you should see movement in front of the sensor as output in your serial console.

Where to use?

The fact that there is no need of additional components makes this motion sensor very useful for a series of applications. While not detecting any heat source the sensor consumes 0.076mA and in the two seconds after detection even goes down to 0.016mA. So in theory the sensor alone could run on a 1200mAh battery for nearly two years.  Together with a clever circuit you can put the ESP8266’s CH_EN (chip enable) pin low and send it to an ultra deep sleep (0.5µA!!!) and only wake it up when motion has been detected. Read more in this post over at the ESP8266 forum how it can be done: http://www.esp8266.com/viewtopic.php?f=11&t=4458

The schema looks promising but I haven’t tried it out yet.

Pros and Cons

The low price, small form factor, the simple interface and its ability to handle a wide range of voltages makes it very convenient to use with the ESP8266. The detection range on the other hand seems to be rather short, I had accurate detections within about 2 meters. Nonetheless there are still many applications that you can use this module for…

Where to buy?

Order one now from Banggood