The main aim of this project is to design and develop an IoT-based home automation system that enables users to control electrical appliances remotely using the Blynk mobile application. The system uses a NodeMCU development board based on the ESP8266 Wi-Fi module to establish wireless communication between the mobile application and the home appliances. This allows users to switch electrical devices ON or OFF through an Android smartphone from any location with an internet connection. The NodeMCU acts as the main controller of the system. Two relays are interfaced with the NodeMCU to control two lights, while two transistors are used as switching devices to control a fan and a buzzer. The Blynk application provides a user-friendly interface with buttons for controlling each appliance. When the user presses a button in the application, the command is transmitted through the internet to the NodeMCU via Wi-Fi. The NodeMCU processes the received command and controls the corresponding relay or transistor to switch the connected appliance ON or OFF. The relays operate as electrically controlled switches, allowing the NodeMCU to control the lights safely through suitable driver circuitry. The transistors act as electronic switches for controlling the fan and buzzer, with appropriate driver components where required. An LCD is interfaced with the NodeMCU to display the real-time ON/OFF status of the connected appliances. Thus, the proposed system provides convenient, wireless, and efficient control of home electrical appliances using IoT technology.            

 The objectives of the project include:

• Controlling home alliances through Blynk app.
• To Control the devices using Wi-Fi technology.
• Load status can monitor on LCD.
• Relays based device switching.
• Using NodeMCU module to achieve this task.

       

The main building blocks of the project are:

• NodeMCU.
• 2 RELAY BORD.
• 2 transistor board.
• 4 Appliances (bulb, light, fan, buzzer).
• LCD display.

           

Software’s used:  

1. Arduino IDE studio compiler to write the program.
2.  Express SCH for Circuit design.
3. Blynk APP.

               

video: