Arduino Projects

How to make Motion Sensor light Homemade | PIR light sensor | Automatic light switch

Motion Sensor Light Control, Description:


In this tutorial, you will learn how to control a 110 or 220vac Disco Light using only PIR Sensor” Motion Sensor”. PIR Sensor is one of the most commonly used sensors for motion detection. You will practically see how a light bulb automatically turns ON when I enter the room. So far this is my third tutorial on a PIR motion sensor.

The same circuit can be used in Lawns, Corridors, Living rooms, Streets,  and so on. This is a low-cost automatic light controller based on the Motion Sensor.

In the first tutorial, I covered all the basics, including the pinouts, the purpose of the variable resistors, and how to use a PIR sensor with Arduino.

While in the second tutorial I used this PIR sensor with the GSM SIM900A module and designed a security system.

In this tutorial, we are not going to use Arduino or any other microcontroller. We will only be using a PIR sensor to control a 12v relay. This tutorial covers

  1. Motion Sensor Light Control Circuit explanation
  2. PIR”Motion Sensor” Interfacing and finally
  3. Testing

Let’s get started!!!!!

Amazon Links:

PCB screw Terminal block connector:

Disco Light RGB

LM7805 Voltage Regulator:

1n4007 diode:

10k Resistor:

2n2222 NPN transistor

12V SPDT Relay:

One-Channel Relay Module:

Other Tools and Components:

Top Arduino Sensors:

Super Starter kit for Beginners

Digital Oscilloscopes

Variable Supply

Digital Multimeter

Soldering iron kits

PCB small portable drill machines


Please Note: these are affiliate links. I may make a commission if you buy the components through these links. I would appreciate your support in this way!

Motion Sensor Light Control Circuit Diagram:

motion sensor light control circuit digram, in this image you can see the pir sensor is powered up using the 7805 voltage regulator

This is the regulated 5v power supply based on the LM7805 voltage regulator. This power supply will be used to power up the PIR Sensor Module. This is the dc female power jack. A 10uf capacitor is connected at the input side of the 7805 voltage regulator. Another 10uf capacitor is connected at the output side of the voltage regulator. A 330-ohm resistor is connected in series with a 2.5v led. This is a current limiting resistor. I have a very detailed tutorial on led and how to calculate the value of the current limiting resistor.

A wire from the output of the voltage regulator is connected with the Vcc pin of the PIR sensor module, and also make sure you connect the ground of voltage regulator with the ground of the PIR sensor module. The Out pin of the PIR sensor is connected with the base of the 2n2222 NPN transistor through a 10k resistor. the emitter of the 2n2222 NPN transistor is connected with the ground while the collector side is connected with one side of the relay coil and the relay coil other side is connected with the 12 volts.

The 2n2222 NPN Transistor and the 10k-ohm resistor makes the Relay driver. The PIR Motion Sensor with the help of the relay driver controls the light. This way it eliminates the need for a programmable controller. Jut by using a few electronic components a low-cost automatic light controller can be designed in no-time.

For the Interfacing and Testing watch video tutorial given below.

Watch Video Tutorial:

Engr Fahad

My name is Shahzada Fahad and I am an Electrical Engineer. I have been doing Job in UAE as a site engineer in an Electrical Construction Company. Currently, I am running my own YouTube channel "Electronic Clinic", and managing this Website. My Hobbies are * Watching Movies * Music * Martial Arts * Photography * Travelling * Make Sketches and so on...

One Comment

  1. Nice blog. Thanks For Sharing blog.
    Visit our website for motion sensor for lights, pir motion sensor, smart motion sensor led light. Contact us for buy pir motion sensor.

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