In this project, we are getting to build a home light controlling system using the Bluetooth network. during this project, we use Bluetooth Module HC-05, Arduino Device, 4 Channel Relay module, etc.

Hardware Requirements

Arduino UNO board
USB cable for connecter Arduino UNO
Bluetooth Module HC-05
4 Channel Relay module (5V)
Jumper wires male to female
Home Light (Bulb)
Bulb holder
Wire
AC 220v/120v home appliances or 9v Hi-Walt Battery

Software requirements

Arduino software

Working principle of Arduino-Bluetooth Module

In this project, there are four main components used: Android smartphone Bluetooth application, Bluetooth transceiver, Arduino device, and 4 Channel Relay module.

The Android app sends the serial data to the connected Bluetooth Module HC-05 by clicking ON button. The Bluetooth device receives the info from the app and sends it through TX pin of Bluetooth module to RX pin of Arduino. The Arduino device read the input file and process it consistent with program uploaded inside it and generate the output to 4 Chanel Relay Module.

When the Bluetooth application’s button activates , it sets the house light ON, and when the Bluetooth application’s button turns OFF, it sets the house light OFF.

Write an Arduino program to regulate the house light using Bluetooth Module, 4 Chanel Relay Module with Android application.

String inputs;
#define relay1 2 //connect relay1 to pin 9
#define relay2 3 //connect relay2 to pin 8
#define relay3 4 //connect relay3 to pin 7
#define relay4 5 //connect relay4 to pin 6
#define relay5 6 //connect relay5 to pin 5
#define relay6 7 //connect relay6 to pin 4
#define relay7 8 //connect relay7 to pin 3
#define relay8 9 //connect relay8 to pin 2
void setup(){
Serial.begin(9600); //set rate for communicating with phone
pinMode(relay1, OUTPUT); //set relay1 as an output
pinMode(relay2, OUTPUT); //set relay2 as an output
pinMode(relay3, OUTPUT); //set relay1 as an output
pinMode(relay4, OUTPUT); //set relay2 as an output
pinMode(relay5, OUTPUT); //set relay1 as an output
pinMode(relay6, OUTPUT); //set relay2 as an output
pinMode(relay7, OUTPUT); //set relay1 as an output
pinMode(relay8, OUTPUT); //set relay2 as an output
digitalWrite(relay1, LOW); //switch relay1 off
digitalWrite(relay2, LOW); //switch relay2 off
digitalWrite(relay3, LOW); //switch relay1 off
digitalWrite(relay4, LOW); //switch relay2 off
digitalWrite(relay5, LOW); //switch relay1 off
digitalWrite(relay6, LOW); //switch relay2 off
digitalWrite(relay7, LOW); //switch relay1 off
digitalWrite(relay8, LOW); //switch relay2 off
}
void loop(){
while(Serial.available()){ //check if there are available bytes to read
delay(10); //delay to form it stable
char c = Serial.read(); //conduct a serial read
if (c == ‘#’){
break; //stop the loop once # is detected after a word
}
inputs += c; //means inputs = inputs + c
}
if (inputs.length() >0){
Serial.println(inputs);
if(inputs == “A”){
digitalWrite(relay1, LOW);
}
else if(inputs == “a”){
digitalWrite(relay1, HIGH);
}
else if(inputs == “B”){
digitalWrite(relay2, LOW);
}
else if(inputs == “b”){
digitalWrite(relay2, HIGH);
}
else if(inputs == “C”){
digitalWrite(relay3, LOW);
}
else if(inputs == “c”){
digitalWrite(relay3, HIGH);
}
else if(inputs == “D”){
digitalWrite(relay4, LOW);
}
else if(inputs == “d”){
digitalWrite(relay4, HIGH);
}
else if(inputs == “E”){
digitalWrite(relay5, LOW);
}
else if(inputs == “e”){
digitalWrite(relay5, HIGH);
}
else if(inputs == “F”){
digitalWrite(relay6, LOW);
}
else if(inputs == “f”){
digitalWrite(relay6, HIGH);
}
else if(inputs == “G”){
digitalWrite(relay7, LOW);
}
else if(inputs == “g”){
digitalWrite(relay7, HIGH);
}
else if(inputs == “H”){
digitalWrite(relay8, LOW);
}
else if(inputs == “h”){
digitalWrite(relay8, HIGH);
}
inputs=””;
}
}

Compile and upload your code into the Arduino device using Arduino USB cable. While uploading code doesn’t connect other devices with Arduino.

Digital circuit diagram

Bluetooth Module HC-05 Arduino UNO

RX ——————————–> TX

TX ——————————–> RX

GND —————————–> GND

5V ——————————–> 3.3V

4 Channel Relay Module Arduino UNO

GND ——————————> GND

IN1 ——————————–> Pin 9

IN2 ——————————–> Pin 8

IN3 ——————————–> Pin 7

IN4 ——————————–> Pin 6

VCC ——————————–> 5V

Connection between Relay Module, Bulb, and input power:

Connect common-point (com) of Relay Module with home light.
Connect normally-close (nc) of Relay Module with power.
Connect remaining one home light wire with the facility source.

Download and install the Android application of Arduino Bluetooth Controller.apk file.

Output of project:

So, this brings us to the end of blog. This Tecklearn ‘IoT project of controlling home light using Bluetooth module , Arduino device , and 4 Channel 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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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
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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

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