How to Make Bluetooth Controlled Lamp

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Hey guys! I am back with another cool project from our channel 'Being Engineers'. If you want to make a simple Bluetooth Controlled Lamp but don't know how to start, then you have come to the right place. Let's get on with it!

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Step 1: Make the App

Firstly you will have to make the app to control it.

1. Search MIT App Inventor 2 in Google

2. Sign in with your Google Account (if you haven't)

3. Select 'New Project' and give 'Project Name'

Now, follow the rest of the steps on how to make this app in the video given above. You will see that first we have made the layout and then we will do the design part (or rather the algorithm).

Step 2: Install the App and Upload the Code to Arduino

After you have completed, save and build it.

Save it in desktop as .apk file.

Transfer the app to your mobile and install it. Here is the download link of the .apk file that we made.

Bluetooth_App.apk - Download

The link for Arduino code!

Step 3: Components

It's time to list down the components.

The detailed description of the components is given in the video. Do have a look.

1. Arduino UNO

2. 12V or 5V Relay Module

3. Power Source board

4. HC-05 Bluetooth Module

5. Jumpers

6. Wall socket plugs

I have also provided the Best Buy Links:


Arduino UNO -

Jumper wires -!QuuuuN

Relay Module(2 channel, 5V) -

HC -05 Bluetooth Module -

12V DC Adapter -


Arduino Uno -

Jumper wires -

Relay Module(2 channel, 5V) -

HC -05 Bluetooth Module -

12V DC adapter -

Screw driver set -

Step 4: Circuit

So are you ready? Let's begin with the circuit!

Check the diagram above. You can also follow the step in the video. It will be better to understand. But still I am chalking out the steps briefly.

1. VCC of HC-05 => 5V pin of UNO

2. GND of HC-05 => GND of UNO

[1. and 2. to power the Bluetooth Module]

3. Tx of HC-05 => Rx of UNO

4. Rx of HC-05 => Tx of UNO

5. 5V pin from Power Source Board => Vin pin of UNO

6. GND from Power Source Board => another GND of UNO

[5. and 6. to power the UNO which in turn would power Bluetooth Module]

7. pin 10 of UNO => pin 2 of Relay

8. VCC of Relay Board => 12V pin of Power Source Board

9. GND of Relay Board => GND pin of Power Source Board

Step 5: It's Finally Done!

1. Open your mobile settings.

2. Open Bluetooth and turn ON.

3. Pair with HC-05 by default pin ID 1234 (if it gives an error, try with 0000)

4. Open the app, select Bluetooth device : HC-05.

5. If the label shows 'connected', then it is done. Touch ON and OFF button and see the result!

I hope you have enjoyed the video and this Instructables. We would love to have some feedback. :)

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    11 Discussions


    2 years ago

    I am getting error in Adriano code saying redefinition of void setup help


    2 years ago

    After everything how did u connect to the lamp


    2 years ago

    HELLO!!is there any alternative for POWER SOURCE BOARD?


    3 years ago

    Hi - is there code for the Arduino please?

    1 reply
    Being EngineersKenL39

    Reply 3 years ago

    Yes, it is given in the step 2. If you click on view all steps, you will find it. We will be requiring this to control the relay from pin 10. It's a very simple code. :)


    3 years ago

    Dont know about what is arduino can u plz explain

    1 reply
    Being EngineersParasT3

    Reply 3 years ago

    Arduino is a user-friendly microcontroller board based on atmega 328PPU. If u know coding like C and C++, then arduino is very easy to learn. I would suggest you to go through video tutorials on arduino in YouTube. Lot's of tutorials are there. :)