HC-05 pairing with any other HC-05 module

Other Hardware General Electronics
1

Hey there,

im relatively new to programming with arduino but its quiet easy to learn so i got pretty far.
But now im running in a problem... I try to have some kind of control unit to control multiple devices.
I bought 5 HC-05 Bluetooth modules for transfering data. (might not be the most efficient but im just trying things)
Everything works fine, i can send data between 2 modules and control some device with that.

But now i tried to switch between 2 slave modules so that i can choose one, connect to it, send data and reconnect to the other one as desired. I realised that even in AT+CMODE=0 and AT+BIND=[slave1] the Master will connect to Slave 2 if its powered... it seems that my Master will connect to any HC-05 module it can find regardless the bind address.

ive tried everything, even by fiddeling with settings in the slave.
Seems like the AT-CMODE and AT+BIND settings are ignored completely..
i tried setting different passwords so i can maybe choose the slave by setting the corresponding password but no luck there either..

i hope that you guys can help me out.

Sorry for my broken english :stuck_out_tongue:

2

I do not know about the bluetooth devices, but if you want multiple slaves communicating with a central master the rf24 radios may be a better fit. Up to 6 slaves can talk to a single master (more if networking is used). And the range is greater (100 meters*, clear line of sight) than Bluetooth.

Robin2's simple rf24 tutorial is a good introduction to those radios. Do be aware that you need an older version of the RF24 library (as explained in the tutorial).

  • farther with the high power modules.
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