Arduino Wireless LED 230V AC/DC Devices with Smart Phone

Hello, 

it has been good so far to control the LED with your Smartphone but what's next? Wouldn't it be amazing to control a 230V AC/DC appliance we use at our homes with a touch from your Smartphone?

This is also a great and cheap final year engineering project for Electrical Engineering, Electronics and communication Engineering students.

In this article, you will find the arduino tutorial for wireless arduino LED lights and the source code for the wireless arduino bulb project.

I would recommend using arduino uno development board R3 for this arduino project as that is the simplest and newest version in arduino module and arduino boards.

Before this, you should read: Wireless Control of LED with Arduino and Smartphone !

Here's the arduino tutorial for you.

Things you'll need:

1. Arduino Board (Uno R3 or any other board)

2. BT HC-05 Module (dummy works fine)

3. Android phone (v2.3 or higher)

4. 230 V AC Bulb 

5. AC Bulb holder

6. SPDT relay 6V

7. BC 547 NPN Transistor

8. 330 ohm Resistance

9. 1N4007 Diode

10. Breadboard

11. Jumper cables

Components required for this project

Relay pins marked for connections

The Medium of communication between Arduino and the Android application is Bluetooth so you will need an android application installed in your smart phone that will be used to send the data over Bluetooth to Arduino. You may download the app from play store (Arduino Bluetooth, Arduino RC etc) or the better option would be to go ahead and create your very own Android application to talk to your Arduino.

Arduino and android projects are getting more attraction in market as both platforms, arduino and android have made it simple for any non tech person to make his/her own arduino project and learn from many free arduino tutorials and how to arduino's online.

It is a great arduino project idea, arduino uno project idea for arduino beginners and arduino projects and arduino tutorials seeking enthusiasts.

Step 1: Making the Circuit

1. Connect the 6V relay on the breadboard such that the 3 pins of the relay are on one half of the breadboard and the remaining two on the second half.

2. Connect the BC 547 NPN transistor on the breadboard.

3. Connect the Collector pin of the transistor to the pin 3 of the relay.

4. Connect the Base of the transistor to the 330 ohm resistance and the other end of the resistance to the pin 13 of Arduino board.

5. Connect the Emitter pin of the transistor to the ground of the Arduino.

6. Connect pin 1 of the relay to the +5 V of the Arduino.

7. Connect the diode across pins 1 and 3 of the relay to ensure unidirectional current. Check the polarity of the diode. Positive of the diode to pin 3 and negative of diode to pin 1.

8. Connect the Vcc of the Bluetooth Module to the 3.3 V of the Arduino and the Ground of the Bluetooth Module to the Ground of the Arduino.

Primary Circuit of the project

Note: Do not connect the Tx and Rx pins of the Bluetooth Module to the Arduino board. Wait till you upload the code.

Step 2: Uploading the code

Connect your Arduino board to your computer/laptop and open the Arduino Software and paste the following code:

int led = 13; // Pin 13

     

void setup()

{

    pinMode(led, OUTPUT); // Set pin 13 as digital out

     

    // Start up serial connection

    Serial.begin(9600); // baud rate

    Serial.flush();

}

     

void loop()

{

    String input = "";

     

    // Read any serial input

    while (Serial.available() > 0)

    {

        input += (char) Serial.read(); // Read in one char at a time

        delay(5); // Delay for 5 ms so the next char has time to be received

    }

     

    if (input == "on")

    {

        digitalWrite(led, HIGH); // on

    }

    else if (input == "off")

    {

        digitalWrite(led, LOW); // off

    }

}

Now, upload this code to your Arduino board and check it using serial monitor.

When you type "on", the relay should be energized and you should hear a 'click' sound and when you type "off", the relay should be de-energized and again, you should hear a 'click' sound. If you hear the relay in operation as per the command given, the circuit is fine and you may now connect the 230V AC bulb to the relay.

Step 3: Smart phone Based 230V AC Bulb

1. Now, connect the bulb to the holder and the two required wires for phase and neutral to the holder points.

2. Connect one wire from the holder to the N.O. of the relay and the other wire from the holder to the socket.(using a plug is advised for safety)

3. Connect pin 2 of the relay to the other socket pin to complete the circuit.

4. Connect the Tx of the Bluetooth Module to the Rx of the Arduino board.

5. Connect the Rx of the Bluetooth Module to the Tx of the Arduino board.


6. Open the application in your Smartphone and search for nearby Bluetooth devices, pair up with HC-05 with the code '0000' or '1234'.

Final Circuit of the project

Give commands via pressing buttons, you may also add gestures or even use smart phone's accelerometer sensor to give commands.

You may also read: Wireless Control of LED with Arduino and Smartphone !

Stay hungry! Stay foolish!