Grove - PIR Motion Sensor


3.3V 5.0V

This sensor allows you to sense motion, usually human movement in its range. Simply connect it to Grove - Base shield and program it, when anyone moves in its detecting range, the sensor will output HIGH on its SIG pin.


  • Grove compatible interface
  • Adjustable detecting distance
  • Adjustable holding time


More details about Grove modules please refer to Grove System


Parameter Value/Range
Operating Voltage 3V–5V
Operating Current(VCC = 3V) 100uA
Operating Current(VCC = 5V) 150uA
Measuring Range 0.1 - 6m
Default detecting distance 3m
Holding Time 1 - 25s
Working Wave Length 7 - 14um
Detecting Angle 120 degrees

Platforms Supported

Getting Started

With Arduino

The following sketch demonstrates a simple application of sensing motion. When someone moves in its detecting range, it will output High through its SIG pin and the LED will light. Otherwise, it will output LOW. Then you can use it to detect the motion of people.


Here we will show you how this Grove - PIR MOTION SENSOR works via a simple demo. First of all, we need to prepare the below stuffs:

Seeeduino V4 Grove - PIR MOTION SENSOR Base Shield
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  • Connect Grove - PIR Motion Sensor to D2 port of base shield.
  • Connect Grove - LED to D4 port of base shield.
  • Plug the base Shield into Arduino.
  • Connect Arduino to PC by using a USB cable.


  • upload the code into Arduino.
/*macro definitions of PIR motion sensor pin and LED pin*/
#define PIR_MOTION_SENSOR 2//Use pin 2 to receive the signal from the module
#define LED 4//the Grove - LED is connected to D4 of Arduino

void setup()

void loop()
    if(isPeopleDetected())//if it detects the moving people?
        digitalWrite(LED, HIGH);
        digitalWrite(LED, LOW);

/*Function: Detect whether anyone moves in it's detecting range*/
/*Return:-boolean, true is someone detected.*/
boolean isPeopleDetected()
    int sensorValue = digitalRead(PIR_MOTION_SENSOR);
    if(sensorValue == HIGH)//if the sensor value is HIGH?
        return true;//yes,return true
        return false;//no,return false
  • The led will turn on when we walk around.


The detecting distance and holding time can be adjusted by adding two extra potentiometers on board. For the details please refer to the V1.2 Eagle below. The module can also be set as retriggerable or un- retriggerable by changing the jumper hat.

With Raspberry Pi


First of all, we need to prepare the below stuffs:

Raspberry pi Grove - PIR MOTION SENSOR GrovePi_Plus
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  • Follow instruction to configure the development environment.
  • Plug the sensor to grovepi+ socket D8 by using a grove cable.


  • Navigate to the demos’ directory:
  cd yourpath/GrovePi/Software/Python/
  • To see the code
   nano   # "Ctrl+x" to exit #
import time
import grovepi

# Connect the Grove PIR Motion Sensor to digital port D8
pir_sensor = 8


while True:
        # Sense motion, usually human, within the target range
        if grovepi.digitalRead(pir_sensor):
            print 'Motion Detected'
            print '-'

        # if your hold time is less than this, you might not see as many detections

    except IOError:
        print "Error"
  • Run the demo.
   sudo python


ArduinoWioBeagleBoneRaspberry PiLinkIt ONE


The platforms mentioned above as supported is/are an indication of the module's hardware or theoritical compatibility. We only provide software library or code examples for Arduino platform in most cases. It is not possible to provide software library / demo code for all possible MCU platforms. Hence, users have to write their own software library.

Help us make it better

Thank you for choosing Seeed. A couple of months ago we initiated a project to improve our documentation system. What you are looking at now is the first edition of the new documentation system. Comparing to the old one, here is the progresses that we made:

  • Replaced the old documentation system with a new one that was developed from Mkdocs, a more widely used and cooler tool to develop documentation system.
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  • Reviewed and rewrote documents for hundreds of products for the system’s first edition, and will continue migrate documents from old wiki to the new one.

An easy-to-use instruction is as important as the product itself. We are expecting this new system will improve your experience when using Seeed’s products. However since this is the first edition, there are still many things need to improve, if you have any suggestions or findings, you are most welcome to submit the amended version as our contributor or give us suggestions in the survey below, Please don’t forget to leave your email address so that we can reply.

Happy hacking