Description

The PIR motion sensor is ideal to detect movement. PIR stands 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. 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

Required parts for this project

1x PIR Motion Sensor (HC-SR501)

Arduino UNO – read Best Arduino Starter Kits

1x LED

Jumper Cables

You can use the preceding links or go directly to MakerAdvisor.com/tools to find all the parts for your projects at the best price!