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BLUETOOTH VOICE-CONTROLLED LIGHT SYSTEM

Imagine being able to control your lights with just your voice, without needing to touch a switch. 

This Bluetooth voice-controlled light system makes it possible by connecting your smartphone to a Bluetooth module on an Arduino. You can easily turn your lights on and off, adjust their brightness, or set the mood, all through simple voice commands. It’s a hassle-free way to manage your lighting, offering both convenience and a smarter way to interact with your home or workspace.

Components Required

  • Arduino Uno
  • Bluetooth Module (HC-05 or HC-06)
  • Relay Module
  • Light Bulb (or other devices)
  • Jumper Wires
  • Breadboard
  • Smartphone with Bluetooth
  • LED/Buzzer (optional for feedback)

Circuit Diagram

Component Connections

1. Connect the Bluetooth Module:

  • VCC → 5V on Arduino
  • GND → GND on Arduino
  • TX → RX on Arduino
  • RX → TX on Arduino

2. Connect the Relay Module:

  • Relay Input → D7 on Arduino
  • VCC → 5V on Arduino
  • GND → GND on Arduino
  • Relay Output → Light Bulb/Device connections​

Installation and Setup

  • Mount the Relay and Light Bulb:
    Attach the relay to the light circuit, ensuring the light can be controlled through the relay. Connect the light bulb or device to the relay's output.
  • Set Up the Bluetooth Module:
    Pair the Bluetooth module with your smartphone. Ensure the Bluetooth is enabled on both the module and your phone for successful communication.
  • Power the System:
    Use a 9V battery or external power supply for the Arduino, while the relay and Bluetooth module are powered via the Arduino.

Upload the Code:

  • Open Arduino IDE.
  • Paste the provided code into the IDE and upload it to the Arduino board.

CODE

#include <SoftwareSerial.h>

const int relayPin = 7;  // Pin controlling the relay  
SoftwareSerial BTserial(10, 11); // RX, TX for Bluetooth module

void setup() {
  pinMode(relayPin, OUTPUT);  
  BTserial.begin(9600);  
  Serial.begin(9600);  
}

void loop() {
  if (BTserial.available()) {
    char command = BTserial.read();  // Read command from Bluetooth  
    if (command == '1') {
      digitalWrite(relayPin, HIGH);  // Turn light on  
      Serial.println("Light ON");
    }
    else if (command == '0') {
      digitalWrite(relayPin, LOW);  // Turn light off  
      Serial.println("Light OFF");
    }
  }

}

CODE EXPLANATION

1. Including Necessary Libraries

#include <SoftwareSerial.h>
  • This line includes the SoftwareSerial library, which allows the Arduino to communicate with the Bluetooth module through software-based serial communication. It is necessary because Arduino boards like the Uno have only one hardware serial port (used for programming), and we use SoftwareSerial to establish another serial communication with the Bluetooth module.

2. Defining Pin Connections

const int relayPin = 7;  // Pin controlling the relay
SoftwareSerial BTserial(10, 11); // RX, TX for Bluetooth module
  • relayPin is set to 7, meaning the relay is connected to digital pin 7 on the Arduino. This relay will control the light.
  • BTserial is an instance of SoftwareSerial, initialized to use digital pins 10 (RX) and 11 (TX) for receiving and transmitting data from the Bluetooth module. These pins are used to communicate with the Bluetooth device (e.g., a smartphone).

3.Setting Up the System

void setup() {
  pinMode(relayPin, OUTPUT);  
  BTserial.begin(9600);  
  Serial.begin(9600);  
}
  • pinMode(relayPin, OUTPUT);: This sets the relayPin (pin 7) as an output. The relay will be activated by sending a HIGH signal (turning the light on) or LOW signal (turning the light off).
  • BTserial.begin(9600);: Initializes communication with the Bluetooth module at a baud rate of 9600, which is the standard rate for many Bluetooth modules like the HC-05.
  • Serial.begin(9600);: Initializes the serial monitor at a baud rate of 9600 to allow communication between the Arduino and your computer. This is useful for debugging or monitoring what is happening.

4. Main Loop: Listening for Bluetooth Commands

void loop() {
  if (BTserial.available()) {
    char command = BTserial.read();  // Read command from Bluetooth
    if (command == '1') {
      digitalWrite(relayPin, HIGH);  // Turn light on  
      Serial.println("Light ON");
    }
    else if (command == '0') {
      digitalWrite(relayPin, LOW);  // Turn light off  
      Serial.println("Light OFF");
    }
  }
}
  • if (BTserial.available()): This checks if there is any incoming data from the Bluetooth module. If data is available (e.g., a voice command from the smartphone), it will proceed to the next step.
  • char command = BTserial.read();: This reads the incoming data and stores it in the command variable. It expects a character to be sent, which will be either '1' (to turn the light on) or '0' (to turn the light off).
  • if (command == '1'): If the command received is '1', the code will:
    • digitalWrite(relayPin, HIGH);: This sends a HIGH signal to pin 7, turning the relay on and thus powering the light.
    • Serial.println("Light ON");: This prints a message to the serial monitor for debugging purposes, confirming that the light was turned on.
  • else if (command == '0'): If the command is '0', the code will:
    • digitalWrite(relayPin, LOW);: This sends a LOW signal to pin 7, turning the relay off and thus turning the light off.
    • Serial.println("Light OFF");: Prints a message to the serial monitor confirming that the light was turned off.

How It Works Together

The system functions by receiving voice commands sent from your smartphone via Bluetooth. Once the command is received, the Arduino processes the instruction, controlling the relay to turn the light or device on or off accordingly. The Bluetooth module serves as the medium through which the smartphone communicates with the Arduino.

OBSERVING FUNCTIONALITY

  • Normal Mode: The system remains idle, awaiting a voice command.
  • Voice Command: Upon receiving the appropriate command, the light toggles between on and off states.

COMMON PROBLEMS AND SOLUTIONS

1. Bluetooth Not Connecting:

  • Cause: The Bluetooth module may not be correctly paired.
  • Solution: Ensure the module is powered and properly paired with the smartphone. Check the Bluetooth settings on both devices.

2. Light Not Turning On/Off:

  • Cause: The relay may not be wired correctly.
  • Solution: Double-check the relay connections and ensure it is controlling the light circuit.

3. No Command Response:

  • Cause: Incorrect code or connection issues.
  • Solution: Verify the code and connections. Ensure the Bluetooth module is receiving and transmitting signals properly.

Conclusion

The Bluetooth voice-controlled light system offers an intelligent and simple solution for modern homes and workplaces. By leveraging the power of Bluetooth and voice recognition, users can easily control their lights or devices with voice commands, creating a smarter, more convenient environment. Whether for ease of access or enhancing your space's atmosphere, this system brings a touch of innovation and comfort to your everyday life.

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