In this project, we are getting to build a home light controlling system using the Wi-Fi network or Internet (Mobile data). Using this project, we are ready to control our home light from anywhere within the world. during this project, we’ll use Wi-Fi Node MCU, 4 Channel Relay module, etc.

Hardware Requirements

Wi-Fi Node MCU ESP8266
Standard USB cable to attach Node MCU
4 Channel Relay module (5V)
Jumper wires female to female
Home Light (Bulb)
Bulb holder
Wire
AC 220v/120v home appliances or 9v Hi-Walt Battery

Software requirements

Arduino software
Blynk app

Working principle of this project (Node MCU, Relay Module)

In this project, there are three main components used an Android Blynk app, Wi-Fi Node MCU and 4 Channel Relay module.

The Android Blynk app sends the serial data to the Wi-Fi Node MCU by clicking ON button. The Wi-Fi Node read the input file and process it consistent with program uploaded inside it and generate the output to 4 Chanel Relay Module.

When the Blynk app’s button activates , it activates the house light, and when the Blynk app’s buttons turns OFF, it turns OFF the house light.

A program written on Arduino IDE to regulate the house light using WiFi Node MCU, 4 Chanel Relay Module:

#define BLYNK_PRINT Serial
#include
#include
char auth[] = “f839fcfeaf4a47cfb5d0f20771e8xxxx”; // the auth code that you simply got on your gmail and Blynk app
char ssid[] = “NETGEAR64”; // username or ssid of your WI-FI
char pass[] = “password”; // password of your Wi-Fi
void setup()
{
// Debug console
Serial.begin(9600);
pinMode(D1,OUTPUT); //extend these to D8 if you’re employing a 8 pin relay
pinMode(D2,OUTPUT);
pinMode(D3,OUTPUT);
pinMode(D4,OUTPUT);
digitalWrite(D1,HIGH); // Make it low if you would like everything to travel off
digitalWrite(D2,HIGH); // just in case of an influence cut
digitalWrite(D3,HIGH);
digitalWrite(D4,HIGH);
Blynk.begin(auth, ssid, pass);
}
void loop()
{
Blynk.run();
}

Add the board type to your Arduino IDE

Add the board type to your Arduino IDE if not added earlier before compiling. attend File > Preferences > Settings and add http://arduino.esp8266.com/stable/package_esp8266com_index.json in Additional Boards Manager URLs and click on OK.

Include the esp8266 board community before compiling the above code otherwise, it generates a mistake .

To include library click Tools > Board > Board Manage…

Search for esp8266 and install it.

Select your board type

Now, select your board type, attend Tools > Board: > NodeMCU 1.0.

Add Libraries

Download the newest Blynk library from https://github.com/blynkkk/blynk-library/releases/latest and add it to program

If the Blynk libraries aren’t ready to be added in your program then, extract it and paste all the directories in Arduino libraries C:\Program Files (x86)\Arduino\libraries.

Now, connect Node MCU device together with your pc using Standard USB cable to attach Node MCU and upload the program in it.

Digital circuit diagram

4 Channel Relay Module Node MCU

GND ——————————–> GND

IN1 ——————————–> D0

IN2 ——————————–> D1

IN3 ——————————–> D2

IN4 ——————————–> D3

VCC ——————————–> Vin

Connection between Relay Module, Bulb, and input power:

Connect common-point (com) of Relay Module with home light.
Connect normally-open (no) of Relay Module with power.
Connect remaining one home light wire with the facility source.

This project has operated using both Wi-Fi also as Mobile data.

Output:

So, this brings us to the end of blog. This Tecklearn ‘IoT project of controlling home light using WiFi Node MCU, and Relay module’ blog helps you with commonly asked questions if you are looking out for a job in Internet of Things (IoT). If you wish to learn IoT and build a career in Internet of Things (IoT) domain, then check out our interactive, Internet of Things (IoT) Training, that comes with 24*7 support to guide you throughout your learning period. Please find the link for course details:

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What you will Learn in this Course?

Introduction to Internet of Things

What is IoT, how does it work
IoT vs IIoT
Business Cases of IIoT
Industry 4.0
Properties of IoT device
IoT Ecosystem
IoT Decision Framework
IoT Solution Architecture Models
How IoT is Transforming Businesses
Major IoT Boards in Market

IoT Communication Protocols

Types of wireless communication
Major wireless Short-range communication devices and properties
Comparison of these devices (Bluetooth, WIFI, ZigBee, 6LoWPAN)
Major wireless Long-range communication devices and properties, Comparison of these devices (Cellular IoT, LPWAN)

IoT Architecture

The IoT Stack Architecture and the various components and layers
The app, the data processing and platform
IoT OS like Contiki, FreeRTOS and mbe
The edge and the connected thing or device

IoT Sensors and Device Platforms

Introduction to IoT Sensors and the role they play in getting the IoT systems work efficiently
Micro-electromechanical systems revolutionizing IoT sensors
Use Case of Water Quality Monitoring
Use Case: Sericulture
Difference between microcontroller and microprocessor
IoT Device Platforms – Arduino, Raspberry Pi etc
Smartphone Centric Architecture
IoT Application Layer protocols
Hands On

Arduino Platform and Arduino Interfacing

Arduino physical board, libraries and the Integrated Development Environment
Arduino Shields various operations such as heat and light sensing, GPS, UI display
Programming Arduino using C language
Controlling external devices using pins on the Arduino board
The Arduino Interface
Reading inputs from various sources and providing an output
Working with sensors for sensing and controlling the physical world
Deploying various types of sensors and connecting it to the Arduino
Constant conversion between analog and digital signals for information exchange between the physical and digital domains
Hands On

Raspberry Pi Platform and Raspberry Pi Interfacing

Introduction to Raspberry Pi
Set up of Raspberry Pi environment
Coding for the Raspberry Pi using Python
Deploying Python-based Integrated Development Environment
Interfacing the Raspberry Pi with the physical world
Introducing the various input and output devices
Raspberry Pi expansion boards for building complex hardware setup
Real-time demo of Raspberry Pi interfacing
Hands On

Arduino Uno Wifi and IoTivity

Iotivity
Iotivity Architecture
Hands On

Netduino Platform and Netduino Interfacing

Introduction to Netduino Platform
Setting up the Netduino environment
Coding for the Netduino
Interfacing the Netduino with the physical world
Introducing the various input and output devices
Real-time demo of Netduino interfacing
Hands On

IoT for Arduino, NodeMCU and Netduino

Control LED light using Netduino board
NodeMCU
Blynk

Project: Building WSN with MQTT, Raspberry Pi & Arduino

Got a question for us? Please mention it in the comments section and we will get back to you.

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