Bluetooth module HC-06 reset baud rate

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I didn't know the maximum baud rate of PC is 115200 before I used AT command to set the 921600 as a new baud rate through Arduino for my Bluetooth. Now I can't access to the AT mode again to reset the baud rate. Is there any solution that I can fix this problem>? 

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The PC can do baud rates up to at least 1,000,000 baud.  It has a gigaHertz CPU.  Are you referring to the maximum baud rate that the Arduino serial monitor can do?  I think that the Serial Monitor is limited to 115200.  If this is the case, then get a USB-serial interface from eBay (2-3 week wait) or Amazon ( 2-3 day wait, but a little more expensive) that will plug into one of the USB slots on your PC.  Now you can use a modern PC-based terminal program to get 921600 baud needed to program the Bluetooth module.  If getting a new USB-serial module, be sure to get one with the CH340 USB-serial IC.  When it arrives you will need to download and install the CH340 Windows driver.  Modern Windows versions require a specific sequence of commands that will allow Windows to suspend its Driver-Authentication-Checking routine in order to install a driver that isn't on the Microsoft-tested-and-approved list.  Again, search Google for instructions on how to do this.  If ordering a USB-serial module, get a USBasp module as well.  They only cost a few dollars, and are very handy for programming Arduinos if/when the bootloader gets corrupted.

 

It might be also that your PC terminal program that has the 115200 baud rate limit if it is from the Windows 98 era.  Try searching Google for a different PC terminal program that can work with a higher baud rate.

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Simonetta wrote:
It might be also that your PC terminal program that has the 115200 baud rate limit if it is from the Windows 98 era.

It is, ie. Termite lets you set custom baud rate up to maximium what windows supports(I think the limit is uint32) if we even talk about windows here.

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Wenyu wrote:
I didn't know the maximum baud rate of PC is 115200

As already noted, it isn't.

 

But it might be a limit of the specific COM port you are using, and/or the specific terminal software you are using.

 

Genuine FTDI USB-to-Serial adaptors can certainly do 921600.

 

Some of the cheaper USB-to-Serial adaptors that I have will not do 921600.