Hello  guys welcome back clue to everything here , 
Today i will be demonstrating you how to make Home Automation system using Arduino uno R3





Components required -
1. Arduino uno R3
purchase - 
Global -
INDIA
2. Relay module (any no of channels)
purchase -
INDIA 
GLOBAL

 3. HC05 bluetooth module 
purchase -

 4. Male to Female jumper wires 
purchase -

 5. Adapter or Arduino cable for powering board 
purchase -


Step 1 
First program your Arduino Uno R3 board 
(upload the code first to avoid errors ) 
code download link below 
step 2 
connections 

 HC05 to   Arduino 

 RX    --> TX 
TX    --> RX 
5V    --> VIN 
GND --> GND 

 Relay to Arduino 

 VCC  --> 5V
GND --> GND 
IN1   --> 3
IN2   --> 4
IN3   --> 5
IN4   --> 6 
(If your using bigger relay module like 6 , 8 channels continue the connections IN5 --> 7 , IN6 -->8 and so on ) 
STEP 3
Now connect your device, light, fan to the relay , (same connection like a normal switch ) 
Now the main connections are done 
Download the app and connect to the HC05 module 
the module password will be usually "1234"or"0000"

 Done 

 Diagram - 







CODE -