Is there anyway to change baud rate of a bluetooth device from arduino IDE ?

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I want to change the baud rate of a Bluetooth device (optical probe >> optical-probe.de/Optical%20probes/op700.html ). I don't know if it is possible or not, but I tried to do it with AT commands from the serial monitor of the Arduino IDE and no luck.

What I have tried:

The IDE detects my device on port COM9 but after sending AT to the device I got nothing!

Posted 23-Oct-17 1:06am

marimir

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Jochen Arndt 23-Oct-17 7:44am

"The IDE detects my device on port COM9"
Which device (the Arduino or the optical probe)?

You are probably talking with the Arduino via the serial port, not with the probe.

marimir 23-Oct-17 7:50am

I am really new at this .. I don't know but I've thought that the probe has some Arduino board.. correct me if I'm wrong

Jochen Arndt 23-Oct-17 7:59am

So your probe is connected to a PC and it is recognised on COM9. Check the documentation of the probe for accessing it.

What kind of IDE (the Arduino IDE)?
That is for connecting a PC with an Arduino board.

The probe might use an Arduino internally. The documentation (or the manufacturer) should tell you. But even then it might use a different protocol (which should then be documented).

marimir 23-Oct-17 8:52am

The manufacture doesn't give me anything!
All of it is just my guess!

Jochen Arndt 23-Oct-17 9:47am

When you buy a device it should come with some documentation and software like device drivers (if not a plain serial device). The documentation should provide information about the communication protocol (e.g. an AT command set).

I had a look at the web page and there are is no such information provided for download. So it must be shipped with the probes. You can still use the manufacturer's contact page to request more information.

Dave Kreskowiak 23-Oct-17 8:30am

AT-commands are not specific to a serial device. They are for modems and cells.

Bluetooth doesn't have a baud rate in the sense that you're implying so your question doesn't make any sense.

You can change the baud rate of a COM port, even if it's communicating over another transport, like Bluetooth or USB. How you tell the device you've connected to do that is entirely up to the documentation on the device. There is no standard command you can send to the device for this.

Now, if you do get the baud rate changed, that change will probably be forgotten when power is removed from the device and have to be changed again when powered back up. Also, when the rate changes, you'll have to change the baud rate the IDE serial window is using because you'll get nothing or garbage back when the device is talking at a different rate than the serial window expects.

marimir 23-Oct-17 8:52am

Actually I want to develop an android application which can get data from this optical probe via Bluetooth. This App has to read data from electricity meter. I've used bluetoothsocket on android for send and receive data over Bluetooth, but I didn't get any response from the probe.Someone told me that you should use same baud rate for probe and the meter..that's how I'm stuck in this mess!
So you think that it's impossible, thank you.

Dave Kreskowiak 23-Oct-17 10:33am

Impossible? No.

Extremely difficult if you don't have the documentation on the probe? Oh yeah. Without that, you could be speaking English to a probe that only speaks Portuguese and at a rate that is too slow or too fast for it to understand.

Without the documentation on the probe, you're screwed.

marimir 24-Oct-17 2:26am

The only documentation on the probe is what I mentioned in my question >> optical-probe.de/Optical%20probes/op700.html ,that's all.

Dave Kreskowiak 24-Oct-17 8:50am

Well then, it seems your only recourse is to contact the manufacturer and get any documentation they have on it.

If they don't exist, you can't get hold of them, or the documentation doesn't exist, you're pretty much screwed. Find a different, manufacturerr SUPPORTED device.

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