#LED Light control Using Mobile App

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 LED Light control Using Mobile App 

Introduction 

With the growing trend of smart homes, controlling appliances remotely has become increasingly convenient and affordable. This project showcases how to build a straightforward yet effective smart bulb control system using an Arduino, HC-05 Bluetooth module, a relay, and a custom smartphone app. The system enables users to wirelessly control a bulb through Bluetooth communication, offering a simple and practical home automation solution. 

Components Required 

● Arduino UNO 

● Breadboard


● HC-05 Bluetooth Module 

● 5V Relay Module 

● Bulb with Holder

● Smartphone with Custom App 

●

Connecting Wires


● Power Supply 

How It Works 

1. Bluetooth Communication: 

The smartphone app sends an ON or OFF command via Bluetooth to the HC-05 module. The HC-05 transmits this data to the Arduino. 

2. Signal Processing by Arduino: 

The Arduino reads the received signal and processes it. If the signal is "ON," the relay is triggered to turn the bulb on. If the signal is "OFF," the relay disconnects the circuit, turning the bulb off. 

3. Relay Control: 

The relay acts as a switch, controlling the high-voltage connection to the bulb. This ensures safety and efficient control of the appliance. 

Circuit Diagram 

● Connect the HC-05 module to the Arduino: 

○ VCC to 5V 

○ GND to GND 

○ TX to Arduino RX (pin 10) 

○ RX to Arduino TX (pin 11) 

● Connect the relay:

○ IN to Arduino Digital Pin (e.g., Pin 8) 

○ VCC to 5V 

○ GND to GND 

● The bulb is connected to the relay's NO (Normally Open) and COM pins. ● then the final result becomes.. 

1] 

2]


3] code for the mobile app from MIT app inventor. 

Smartphone App 

The custom-built smartphone app sends ‘o’ to turn the bulb ON and ‘a’ to turn it OFF. The app is designed to establish a Bluetooth connection with the HC-05 module, ensuring seamless communication.

Conclusion 

This project provides a practical and cost-effective solution to home automation. By leveraging Arduino, Bluetooth, and a smartphone, you can easily control home appliances with a simple tap on your phone. This project can be further enhanced by integrating voice commands or Wi-Fi control for advanced functionality.

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