Arduino Remote Control Light Switch: Code and Wiring Diagram

In this article, you will learn how to wire and code an Arduino-Controlled Light Switch. The project will let you control a lamp using an Infrared Remote control and a relay module. By pushing a button, you can turn on or off a lamp – just like a television.

Here are the steps in creating the project.

Watch the video here to see the full demonstration of the Arduino Remote Control Light Switch with Code and Wiring Diagram

Arduino Remote Control Light Switch: Steps in Creating the Device

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  1. Gathering the Components

    The first thing to do is to collect the hardware components for the Arduino device.
    Arduino Uno
    IR Receiver and remote
    Single Channel Relay Module
    LED light bulb connected to a wall socket

  2. Connecting the Components

    Connect the components to the Arduino Uno. Please refer to the wiring diagram below.

  3. Coding the Arduino

    Third step is about coding the Arduino device to work with the components.

  4. Upload the Sketch

    Lastly, upload the sketch to the Arduino.

Relay Module Connection in Arduino: Detailed Explanation

To start this project, you need the following:

QtyComponent
1Arduino UNO
1IR receiver and Remote
1Single Channel Relay Module
1LED bulb

Arduino UNO

Arduino Uno
Arduino Uno

For this project, we will be using an Arduino Uno microprocessor board. Arduino Uno is suitable for any projects and is the cheapest and widely used microprocessor board in the Arduino family. This is great for all kinds of IoT projects.

IR Receiver

IR Receiver
IR Receiver

This project uses a standalone IR receiver diode. The first pin is connected to the digital pin of the Arduino. The long pin is the ground connection and the last pin is the Vcc.

IR Remote Control

IR Remote Control
IR Remote Control

This is an IR remote control. IR pulses are transmitted by the remote that is converted to a HEX code. Each button has its own HEX code. If the button is pressed continuously, the HEX code will be 0xFFFFFFFF. 

For a complete guide in infrared remote control project, click here.

Single Channel Relay Module

This project uses a single channel relay module. There are other relay modules available. You can use 2-channel or 3-channel, it simply depends on the project requirements. The single relay module below is rated to switch a single high-powered device from the Arduino. It can switch up to 10 amperes with 250 volts of AC or 30 volts of DC.

This module has 3 pins – Signal, Power, and Ground. The output terminals are COM, NO, and NC.

The middle terminal is the COM. This is where you connect signal you want to switch (example: electricity).

The bottom terminal is the Normally Closed terminal. This terminal is used if you want to turn off your relay by default. On the other hand, the top terminal is the Normally Open terminal. This is the opposite of the other terminal. You can connect here if you want your relay to be open by default.

PLEASE BE CAREFUL IN WIRING. HIGH POWERED ELECTRICITY IS INVOLVED.

Schematic Diagram

Here is the wiring diagram arduino remote control light switch. The red wire of the lamp is connected to the COM terminal and to NO terminal of the relay. The relay itself is powered using the 5V power of the Arduino. Signal pin of the relay is connected to the digital pin 6 of the Arduino.

The IR receiver is connected to the digital pin 7 of the Arduino.

Remote-controlled Light Wiring Diagram
Remote-controlled Light Wiring Diagram

AGAIN, PLEASE BE CAREFUL IN WIRING. HIGH POWERED ELECTRICITY IS INVOLVED.

Code

First is to download the library needed for the project. The “IRremote” library is used here and you can download it using the Arduino Library Manager. Open “Tools>Manage Libraries” and search for “IRremote”. Just install and wait for it to finish.

For the code, objects for IRrecv and decode_results are created. Declare the data pin of the module and the IR . Then for the setup, simply set the pin mode of the declared variable to OUTPUT and enable the IR receiver. In the loop function, if the Arduino receives a signal for button “1”, the relay will switch to on. It will turn off the light by pressing “0”.

Connect your lamp to a wall socket, Double-check the wiring. PLEASE BE CAREFUL IN WIRING THE PROJECT. After that, upload the code to the Arduino.

Output

Now try out your arduino remote control light switch.

Light turns on when button is pressed on the remote.
Light turns on when button is pressed on the remote.

Summary

So there you have it – an Arduino Remote Control Light Switch. This device is simple to create and can be used in other projects as well. You can always add more sensors to the device, upgrading it to a much-sophisticated device.

Download

Click the button below to download the source code.

Inquiries

Feel free to write your questions about the project at the comments below.

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