How to Add Bluetooth to Your Arduino: A Comprehensive Guide
Integrating Bluetooth functionality into an Arduino project can enhance its connectivity and functionality, allowing you to control or monitor your devices remotely. This article will guide you through the process of adding Bluetooth to your Arduino using popular modules like HC05 and HC06, and suggest alternatives for more advanced needs. We'll also cover the AT commands to get started and provide practical examples.
Introduction to Arduino Bluetooth Modules
Bluetooth functionality can be added to your Arduino using various modules. One of the most popular choices is the HC05/HC06 series, which is affordable and widely used. While you can also use other modules like HC06, which is generally more affordable, HC05 is a common default option. These modules are preferred for their simplicity and the wide array of examples available for beginners.
Choosing the Right Bluetooth Module
The HC05 module is particularly popular, and it can be used not only with Arduino but also with other microcontrollers like PIC and ARM. This module supports serial TX and RX communication, making it easy to integrate with an Arduino. It also supports AT commands, allowing you to control the module in master mode.
Steps to Add Bluetooth to Arduino
The following steps outline how to integrate the HC05 Bluetooth module into your Arduino project:
Select the Module: Purchase the HC05 module. You can find it on platforms like Adafruit, where you can find unique and fun DIY kits, starting at $19.95.
Check Pin Configuration: Familiarize yourself with the pin configuration of the HC05 module. You can find detailed pinout diagrams online.
Connect the Module: Use jumper wires to connect the HC05 module to your Arduino according to its pin configuration. The typical connections are:
GND: Connect to the GND pin of your Arduino
5V: Connect to the 5V pin of your Arduino
TX: Connect to the RX pin of your Arduino
RX: Connect to the TX pin of your Arduino. Ensure that the 5V output of the TX pin is dropped to 3.3V to protect the module from voltage damage.
Upload the Code: Use the example code provided in the Arduino IDE to upload the necessary serial communication code. Here's a basic example to get you started:
char inputString ""; // Input character stream from Bluetooth modulevoid setup() { (9600); ("Arduino HC05 Bluetooth ready");}void loop() { if (Serial.available() > 0) { char inChar (); inputString inChar; while (Serial.available() > 0) { char junk (); // Clear the serial buffer } if (inputString[0] > '0' inputString[0]
The above code will read the input character from the Bluetooth module and store it in the variable inputString. You can then use this variable to perform actions based on the input received.
Complementary Options for BLE
If you only need Bluetooth Low Energy (BLE) functionality, there are special shields and boards designed specifically for this purpose, which are usually cheaper. Examples include:
RFduino - Simblee DIP: A low-cost BLE module that can be used with Arduino.
Arduino 101 - DEV-13787 (SparkFun Electronics): An Arduino board with BLE integrated for more advanced projects.
These alternatives offer more specialized features and may be preferred if you require BLE-specific functionalities.
Further Resources
To learn more about using HC05 and other Bluetooth modules with Arduino, you can explore the following resources:
Bluetooth Controlled Car With Camera
Voice Controlled Bluetooth Car
These tutorials provide detailed instructions on connecting the Bluetooth module to your phone and integrating it into your projects.
Conclusion
Adding Bluetooth to your Arduino opens up a whole new realm of possibilities for your projects. Whether you choose the HC05, HC06, or a BLE module, you can enhance your device's connectivity and functionality. The steps outlined above should help you get started with integrating Bluetooth into your Arduino projects. Happy coding!