BLUETOOTH HOME AUTOMATION

Bluetooth home automation allows you to remotely control appliances and devices in your home using your smartphone or tablet. This project explores a DIY approach using an Arduino Uno microcontroller board, an HC-05 Bluetooth module, and a relay.

Components:

• Arduino Uno: The brain of the system, it reads Bluetooth commands and controls the relay.
• HC-05 Bluetooth Module: Enables wireless communication between your smartphone and Arduino.
• Relay Module: Acts as a switch, allowing the Arduino to control high-power devices safely.
• Jumper Wires: For connecting all the components.
• Breadboard: Provides a helpful platform for prototyping the circuit.
• LEDs: Can be added for visual indication of device status.
• Smartphone with Bluetooth App: A pre-built app or a custom-made one using platforms like MIT App Inventor to send control signals to the Arduino.

Working Principle:

1. Connection: The HC-05 connects to the Arduino’s RX and TX pins, enabling serial communication. The relay connects to the Arduino’s digital pin and controls the device via its high-voltage terminals.
2. App Communication: The smartphone app sends Bluetooth commands (like “ON” or “OFF”) to the HC-05 module.
3. Arduino Processing: The Arduino receives the signal, decodes it, and activates the appropriate digital pin.
4. Relay Activation: The activated digital pin triggers the relay, turning the connected device on or off.

Advantages:

• Simple and Affordable: Uses readily available components, making it a good beginner project.
• DIY Friendly: Allows customization based on your needs.
• Wireless Control: Provides remote control from your smartphone within Bluetooth range.

Limitations:

• Limited Range: Bluetooth has a shorter range compared to Wi-Fi based systems.
• Scalability: Adding multiple devices might require additional modules and programming complexity.
• App Dependence: Requires a dedicated smartphone app for control.pen_spark

void setup() {
	  Serial.begin(9600);
	  pinMode(2, OUTPUT);
	  pinMode(3, OUTPUT);
	}
	

	void loop() {
	  if (Serial.available() > 0) {
	    char value = Serial.read();
	    Serial.println(value);
	

	    if (value == 'A') {
	      On1();
	    } else if (value == 'a') {
	      Off1();
	    } else if (value == 'F') {
	      Offall();
	    } else if (value == 'N') {
	      Onall();
	    } else if (value == 'B') {
	      On2();
	    } else if (value == 'b') {
	      Off2();
	    }
	  }
	}
	

	void On1() {
	  digitalWrite(2, HIGH);
	}
	void Off1() {
	  digitalWrite(2, LOW);
	}
	void Offall() {
	  digitalWrite(2, LOW);
	  digitalWrite(3, LOW);
	}
	void Onall() {
	  digitalWrite(2, HIGH);
	  digitalWrite(3, HIGH);
	}
	void On2() {
	  digitalWrite(3, HIGH);
	}
	void Off2() {
	  digitalWrite(3, LOW);
	}