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In this tutorial we show how to communicate using Bluetooth, there are simple and inexpensive modules that can be connected to the Arduino / similar.

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Info
If you have hardware like LaunchPad see the session: EnergiaIDE

On this module, as you can see from the photo above, the TX line is rated at 3.3V. This means that even though we can power the module with 5 volts from the Arduino, the communication lines from and to the module are supposed to be at 3.3 volts.

Receiving data from the Arduino is where we need to do more work. The RX line of the Arduino Uno is running at 5V, so we will be sending a higher voltage on the Bluetooth’s module RX line, than suggested by the label. This may damage the Bluetooth module permanently!

I'm not using any voltage divider and is working properly, but if you do not want to risk burning your module, see this:

Other option:

Image Modified

Upload example to Arduino.

Use BluetoothConnection from Examples menu of Arduino IDE.

The example is virtually identical of USB example.

Before uploading to the arduino, disconnect bluetooth module pins 0 (RX) and 1 (TX), as they are the same ones used by the USB communication and you may have problems if you do not use the voltage divider

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Info
If you are using Leonardo, use: ODev.begin(Serial1, 9600);

Connection with JAVA.

Requirements

If you are using Linux, you must install the following dependencies:

sudo apt-get install bluetooth libbluetooth-dev bluez bluez-tools

Scan bluetooth devices (linux):

hcitool scan

Pair Devices

Pair the module with your PC (or Android/Raspberry). The defaults for the Bluetooth module are:
Default Name: linvor
Default Pairing code: 1234

Tip

On some operating systems when you run the JAVA example, will open a pairing dialog.

If it does not you must add the device manually (run: bluetooth-wizard ) or from networks/bluetooth manager

Auto Paring (linux):

bluetooth-agent 1234 &

Basic Usage

Use the address found and add an output connection:

addOutput(Connections.out.bluetooth("00:13:03:14:19:07"));
Or: connect(Connections.out.bluetooth("00:11:06:14:04:57"));

You can also automatically connect to the first available device:

Note that this will be very slow because it will do the scan and will take the first bluetooth device found (can be up to your phone!)

connect(Connections.out.bluetooth());

Code Block

language	java
title	Complete Example

public class BlinkDeviceDemo extends SimpleDeviceManager {
    public static void main(String[] args) throws Exception {
        new BlinkDeviceDemo();
    }
    public BlinkDeviceDemo() throws Exception {
        Device led = new Device(1, Device.DIGITAL);
        connect(Connections.out.bluetooth("00:11:06:14:04:57"));
        while(true){
            led.on();
            delay(500);
            led.off();
            delay(500);
        }
    }
}

Basically what we need to change is the type of connection to bluetooth

Alternative Hardware Setup

If you need to use other Arduino ports, you can use the SoftwareSerial library, is an example:

Use SoftwareSerial with Bluetooth in order to make it easier to program your Arduino and debug your code when using the Bluetooth module.

Code Block
Bluetooth------------ Arduino GND ------ GND 3.3 do not connect 5.0 ------ 5V RXD ------ D11 TXD ------ D10 KEY do not connect

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In the Java side, you not need change anything

Energia IDE (LaunchPad Hardware)

The Energy IDE is an adaptation of the Arduino libraries to work with the hardware of the LaunchPad. See the supported platforms at:
http://energia.nu/
https://github.com/energia/Energia

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