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Configuring and Pairing Two HC-05 Bluetooth Modules with Arduino

The HC-05 Bluetooth module is a popular choice for wireless communication in various projects, especially those that require a simple and affordable solution. In this tutorial, we will explore how to configure and pair two HC-05 Bluetooth modules using an Arduino board.

Prerequisites

Before starting, make sure you have the following components:

* 2 x HC-05 Bluetooth modules

* 1 x Arduino Uno board

* 1 x LED

* 10 x F electrolytic capacitor

* A USB cable

Pairing Two HC-05 Bluetooth Modules

To pair two HC-05 Bluetooth modules, follow these steps:

1. Connect the RX and TX pins of both modules to each other.

2. Power on the modules.

3. Open a terminal or command window and connect to the serial port of your Arduino board (e.g., Serial Monitor in the Arduino IDE).

4. Send the following commands to configure the module:

* `AT+NAME?`: This command retrieves the name of the module.

* `AT+ROLE?`: This command sets the role of the module (master or slave).

5. Once configured, you can pair the modules by sending the following command: `AT+PSWD=1234` (replace 1234 with your desired password).

Using Arduino to Upload Code OTA

One of the benefits of using the HC-05 Bluetooth module is that it allows you to upload code over-the-air (OTA) to an Arduino Uno board. This feature makes it easy to update your firmware without physically connecting to the board.

To use this feature, follow these steps:

1. Connect your Arduino Uno board to a computer.

2. Open the Serial Monitor in the Arduino IDE and set the baud rate to 9600.

3. Send the following commands to upload code OTA:

* `AT+UPLOAD?`: This command checks if the module is ready for uploading code.

* `AT+UPLOAD=filename.hex`: This command uploads a file named `filename.hex` to the Arduino Uno board.

In this tutorial, we have learned how to configure and pair two HC-05 Bluetooth modules using an Arduino board. We also explored how to use the module to upload code OTA to an Arduino Uno board. With these skills, you can create a wide range of wireless projects that utilize the HC-05 Bluetooth module.

Additional Resources

For more information on the HC-05 Bluetooth module and its features, check out the following resources:

* 'Video tutorial'(https://www.youtube.com/watch?v=bandicam2021-05-17-22-32-46-970)

* 'Arduino library for HC-05 Bluetooth module'(https://github.com/arduino-libraries/HC-05)

Arduino bluetooth hc 05 code