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Arduino with PIR Motion Sensor

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In this project you’re going to create a simple circuit with an Arduino and PIR motion sensor that can detect movement. An LED will light up when movement is detected.

Watch the video below to see how it works


Introducing the PIR Motion Sensor

The PIR motion sensor is ideal to detect movement. PIR stand for “Passive Infrared”. Basically, the PIR motion sensor measures infrared light from objects in its field of view.

So, it can detect motion based on changes in infrared light in the environment. It is ideal to detect if a human has moved in or out of the sensor range.

pir

The sensor in the figure above has two built-in potentiometers to adjust the delay time (the potentiometer at the left) and the sensitivity (the potentiometer at the right).

Pinout

Wiring the PIR motion sensor to an Arduino is pretty straightforward – the sensor has only 3 pins.

  • GND – connect to ground
  • OUT – connect to an Arduino digital pin
  • 5V – connect to 5V

Parts required

Here’s the required parts  for this project

1parts

Schematics

Assemble all the parts by following the schematics below.

Arduino with PIR motion sensor schematics

 

Code

Upload the following code.

»» View and download code on GitHub!

Do you have any questions? Leave a comment down below!

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