Arduino sending data through bluetooth to multiple phones--possible?

Projects General Guidance
1

All,

I have a project where my Arduino and HC-05 sends data to an Andriod phone--it works fine. Can additional phones be paired to the HC-05? The phones will only receive data.

If not is there any way to get this to work?

Thanks in advance.

2

From my tests and what I've been reading, it looks like phones are Master only--so I can't pair multiple phones to the same HC-05. I guess I need them to be slaves, but that doesn't look possible. I can't pair more that one phone to my HC-05 device and if I set my HC-05 to master, I can't pair it to the phone--apparently you can't pair a master to a master.

Basically I need to send small amounts of data to several cell phones every few seconds for around 90 minutes.

Anyone seen any alternatives? Maybe I can set up one "master" phone to the HC-05, then have it host data to the web for other phones to pull? I don't know, kinda stumped here....

Thanks in advance.

3

KrisKasprzak:
From my tests and what I've been reading, it looks like phones are Master only--so I can't pair multiple phones to the same HC-05. I guess I need them to be slaves, but that doesn't look possible. I can't pair more that one phone to my HC-05 device and if I set my HC-05 to master, I can't pair it to the phone--apparently you can't pair a master to a master.

I think that's nonsense. You are implying that a master can only only pair with a slave - which is surely nonsense. I suspect the only thing that counts is that a master initiates the connection, and it neither knows nor cares if the other party is a master or not. In this case, the HC-05 does the connecting, even if the phone has to do the pairing, which is essentially a formality. I also suspect you don't understand the difference between pairing and connecting.

I'm not sure how good an idea it is but I believe you might be able to it, The problems are entirely at the Android end, as you will need a terminal that can auto-connect. As far as Arduino is concerned, it is just a matter turning Bluetooth power off and on, and allowing only connection to a specific Android each time you do so. This is rather like what your car does each time you turn the radio on.