Project Details

Circuit Diagram

The circuit diagram of Home Automation using Arduino, Relay and Bluetooth Module is shown in the figure below. Arduino is our main controller here where we have interfaced Relay and Bluetooth Module.

Interfacing with HC-05 Bluetooth Module

It is a small portable device that is used to be connected in the Arduino board so that it can communicate with mobile or smartphone.It has 6 pins, among which we are concerned with only 4 pins.

• PIN 2  (RXD for receiving information from smartphone through Bluetooth medium)
• PIN 3  (TXD for transmitting information from smartphone through Bluetooth medium)
• PIN 4  (GND for grounding or zero potential point)
• PIN 5  (VCC for supply of 5 Volt in order to power up HC-05)

The TXD pin of Arduino is connected to RXD pin HC-05 and the RXD pin of Arduino is connected to TXD pin of HC-05.
Here, TXD = 1 in Arduino  means transmission of information from Arduino to HC-05.And, RXD=0 in HC-05 means receiving information from from Arduino to HC-05.
Also, TXD = 1 in HC-05 means transmission of information from HC-05 to Arduino.And, RXD=0 in Arduino means receiving information from from HC05 to Arduino.

Interfacing with Relay Module

Relay module for Arduino is one of the most powerful application for Arduino as it can be used to control both AC and DC devices by simply controlling the relay by giving 5V. A relay is basically a switch which is operated electrically by electromagnet.

• Logic GND: This will be connected to GND on your Arduino.
• Input 1 (IN 1): This will be connected to digital pin(2) on your Arduino, or leave it unconnected if you do not want to use this channel.
• Input 2 (IN 2): This will be connected to the digital pin(3) on your Arduino, or leave it unconnected if you do not want to use this channel.
• Input 3 (IN 3): This will be connected to the digital pin(4) on your Arduino, or leave it unconnected if you do not want to use this channel.
• Input 4 (IN 4): This will be connected to the digital pin(5) on your Arduino, or leave it unconnected if you do not want to use this channel.
• Logic VCC : This will be connected to the 5v pin of the Arduino o power the 4 relay module.

Source Code / Programming

long int ac=2;
long int bulb=3;
long int heater=4;
long int fan=5;
char x;
void setup()
{
pinMode(ac,OUTPUT);
pinMode(bulb,OUTPUT);
pinMode(heater,OUTPUT);
pinMode(fan,OUTPUT);
digitalWrite(ac,LOW);
digitalWrite(bulb,LOW);
digitalWrite(heater,LOW);
digitalWrite(fan,LOW);
Serial.begin(9600); 
}
void loop()
{
  if(Serial.available()>0)
  {
  x=Serial.read();
  }
  if(x=='a')
  digitalWrite(ac,HIGH);
  if (x=='b')
  digitalWrite(ac,LOW);
  if (x=='c')
  digitalWrite(bulb,HIGH);
  if(x=='d')
  digitalWrite(bulb,LOW);
  if(x=='e')
  digitalWrite(heater,HIGH);
  if(x=='f')
  digitalWrite(heater,LOW);
  if(x=='g')
  digitalWrite(fan,HIGH);
  if(x=='h')
  digitalWrite(fan,LOW);
}

Application Installation

From the given below link install the app from google play store to your smartphone and connect it as given below process:
https://play.google.com/store/apps/details?id=com.bluetoothcontroller

1. Turn on your smartphone Bluetooth
2. Install and open the app
3. Click on connect to bluetooth
4. Click on HC-05
5. It will ask code, put code ‘1234’ if it doesn’t work then put ‘0000’ if this step doesn’t work here then goto step 1 and try connect manually with same codes and then follow from step 2.
6. Press OK or Connect and now you are done

Commands From Smart Phone After Bluetooth Connection

• a = AC ON
• b = AC OFF
• c = BULB ON
• d = BULB OFF
• e = HEATER ON
• f = HEATER OFF
• g = FAN ON
• h = FAN OFF

PCB Manufacturing

If you want the PCB of the above project ,you can get all the detail information below:

Schematic Diagram

PCB Diagram

3D Diagram

PCB Manufacturing files

Gerber File

Gerber_HOME_2023-05-17Download

Bill Of Materials

I have already uploaded all these required manufacturing files in PCBWAY website. You can easily go to the below link and place you order, and get your Own  Home Automation PCB manufactured from one of the best pcb manufacturer PCBWAY.

Order It Directly From PCBWAY