Bluetooth is one of the most common ways for two devices to communicate. Every phone, tablet and laptop comes with built-in Bluetooth, as do several peripherals. So, with a little DIY work, you can do some wonderful things with this technology.

For any project on this list, you need to know the basics of home electronics. Electronics for and have the necessary tools handy. Some projects require special tools, as noted. And of course, always remember to take all the necessary precautions before you start.

1. Connect Arduino to Arduino via Bluetooth

The main project you need to master is to set up Bluetooth on an Arduino microcontroller and set it up to communicate wirelessly with another Arduino board. For this, Martin Curry has a great step-by-step guide linking two Arduino boards. as master and slave.

Naturally, you will need two Arduino boards and two Bluetooth receiver modules for this. To get started, start with his basic tutorial where he will teach you how to remotely control the LED lighting on an Arduino Slave via the Arduino Master.

Then move on to a more complex project where the slave measures the temperature outside and sends a signal to the master inside, who in turn displays the readings on the screen.

Learning the basics of setting up Bluetooth on two Arduino devices will open up a lot of possibilities for you, from beginner Arduino projects. strange Arduino projects

2. Wireless bulletin board for telephone messages

This might be the easiest and most rewarding project to start with. With an Arduino board, a few wires and an LCD screen, you can type text on your phone and display it on the screen. Similarly, you will have a wireless bulletin board.

This project does not require soldering or any additional skills, you will only connect cables to the parts. Even the code for the Arduino board is ready to download, and there’s a handy Android app you can get from the Play Store. This should all take no more than half an hour, and is the perfect way to get started with DIY electronic projects. Get Started with Electronic Projects

3. Add Bluetooth to your old wired headphones

add bluetooth to old wired headphones

If you have a pair of old wired headphones that are broken break don’t throw them away. This cool do-it-yourself tutorial will show you how to turn them into wireless headphones by adding Bluetooth, and also give you a new plug to connect a standard 3.5mm cable.

You’ll need a mini Bluetooth receiver, adapters for a DC jack and a 2.5mm to 3.5mm jack, and a pair of old headphones. You will also need a soldering iron and a multimeter, which you can find in any hack space.

In this project, you will take apart the headphones and the receiver and then solder them together. Then put everything into the speaker, make a hole for the 3.5mm jack and charging cable.

All of this won’t cost you more than $10, which is cheaper than even the most inexpensive Bluetooth headphones. we can recommend.

4. Add Bluetooth to any car stereo

Most car stereos are equipped with Bluetooth these days, but if you have an older car, you’ll need to find other ways to play music from your phone to your car stereo. Generally, a simple Bluetooth FM transmitter can do the job. But that means you get an extra device in the car instead of an invisible Bluetooth car stereo. For DIY enthusiasts, there is a better way.

The stereo in your car is actually enough space to add a bluetooth module. It costs about $10 on eBay. All you have to do is open up the stereo, plug in the module, and solder a bit.

A few people who have tried this have also said that they succeeded without soldering, but this will depend on your car stereo model. And I have nothing against the original bootloader, but you can read our soldering guide before trying to copy it.

5. Bluetooth smart helmet

add bluetooth headphones to the helmet

Unlike a car, there is no stereo system for your two-wheeler. But hey, Patrick Paniculam found a way to upgrade a motorcycle helmet by adding Bluetooth speakers to it.

You will need old headphones and a Bluetooth receiver module to disassemble, a 3.5mm audio jack, and some thin flat wires. And, of course, a full-face helmet. It’s actually quite easy to crack, with minimal soldering and some adjustments, such as gluing the speakers together with double sided tape.

But while it adds some much-needed features, remember, safety comes first. Do not write or drive, turn up the volume so that you cannot hear others, and generally do your best to keep your attention on the road.

6. Arduino Bluetooth RC Car

Who doesn’t love a good toy with a toy with ? Instead of going shopping, you can make your own RC car with an Arduino board and Bluetooth.

For this project, you will need a custom printed circuit board designed by the manufacturer. You can order it directly from EasyEDA or download the Bill of Materials and Schematics to make your own. Probably wiser to order it.

Along with that, you will need the chassis of an old RC car as well as a cheap Arduino Nano. and other chances, like the Bluetooth module. This project also requires soldering, so be prepared for that. Once you’re done, install the Android app on your phone and start zooming everywhere with your Bluetooth car remote control.

7.Bluetooth lock

Bluetooth lock unlocked with phone

Wouldn’t it be great if you could open the lock with your phone? The Bluetooth lock is amazing, but it’s also the most advanced project on this list. This requires special equipment such as a milling machine, 3D printer, laser cutter, and other things you find at your school or local hack space.

Don’t be scared though. The manufacturer, Kirand1, has written a clear set of instructions that take you through all the steps of building the case, brace and locking pin, on faceplace, and then inserting the electronics (based on the Arduino board).

The final version will allow you to lock and unlock the lock with the touch of a button in the app. It even works on smartwatches.

Beware of Bluetooth Flaws and Security Threats

As convenient as Bluetooth technology is, it does have a few downsides that you need to be aware of. In fact, the open and general nature of the wireless standard makes it a common target for attackers. If you are doing any of these Bluetooth DIY projects, please read about Bluetooth Security Risks.

And to do even more with Bluetooth, try these great ways to get more out of Bluetooth on Android

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