Figure 1: Part

It's easy to handle and can be used as wireless UART communication from PC to any µC. The HC-06 is a slave only device. To establish a connection between two µC, a master device is needed (e.g. the HC-05 can be configured as master or slave).

Once the connection to the Bluetooth module is established, a terminal program can be used to connect to the specified COM port (the connection to the module is represented as a serial connection and the designated COM port can be found in the hardware device manager under Windows).

I prefer MTTTY (can be found here) as a terminal program. It has some cool features.

I wrote a Java program to establish a connection to the COM port. I'll add this as a separated project soon. It's also possible to connect directly to the Bluetooth module using Java APIs, but I haven't tried it yet.

I found an eagle library for the module (download at bottom of page).

Figure 2: Pins

At commands can be used to set up the device. Before paired, the module is in command mode and can be programmed. I used MAX232 voltage level regulator to connect the device directly to the COM port of my notebook (USB to RS232 converter module).

Figure 3: Typical setup for a MAX232

You can also use my MAX232 USB module, which is filed here.

I use the terminal program MTTTY to send the commands. It's important to type the commands very fast, otherwise the commands won't be recognized from the Bluetooth module. MTTTY has a neat feature - it can send txt. files. I just typed my commands in notepad, saved it and send it with MTTTY.

This is a typical schematic to use the HC-06 Bluetooth module as a serial connection between a PC and a µC. Remember, the recommended supply voltage is 3.3V as written in the datasheet.

Figure 4: Application note

I use this module in a RGB matrix project to send images to the matrix.