Instructions | Communication between two hc-05 Bluetooth modules

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Step 11

Whew... now that we're in command mode and we have a serial connection to the master module we'll need to test if we can actually send commands. In Tera term hit ALT+R (you might need something in the clipboard.) Now type in AT and hit send, if you get an OK then all's well. If you have problems check out step four of this other post by techbitar.
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Step 12

Now setting the module to Master mode is as simple as sending the command AT+ROLE=1. If you get back OK then you've successfully set you're module to master role.
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Step 13
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Step 14

Connect you're master module to the UART pins of any MCU and you're slave module in the same way to another MCU and you've got Bluetooth communication.
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Step 15

ConsultingJoe.com wrote 10/28/2014 at 22:37

Yes. also interested in those 2 questions. Great tutorial.

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tharun19 wrote 06/20/2014 at 13:27

Hi, is that it? How is a secure connection built between the two modules? because there is no authentication happening. Just change one module to master and its ready to communicate with another module (slave) directly? What if there are 2 slaves? Kindly let me know :)

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backlunp wrote 06/26/2014 at 19:05

Hi, sorry for the late response. I'm not exactly sure what the underlying routines are that make it work, but when one device is in master mode it will automatically connect to a module in slave mode. It's really that simple. I only have 2 modules so I haven't been able to test using multiple slaves (such as in a multislave piconet.) If you find an answer please let me know and I'll include it in the description

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Communication between two hc-05 Bluetooth modules

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