Serial link with MATLAB The last step in this guide is to connect the UNO to Matlab via the Bluetooth serial link. Matlab has a very large rage of built in functions that control the serial communication (see appendix for more information on the functions). In Matlab create a serial com link object with the desired com port and baud rate. The complete tutorial here: https://circuitdigest.com/microcontroller-projects/how-to-use-bluetooth-with.

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Comments

• In the current GUI, use the networking widget set to Serial data format. Fill in the data of your desired serial port and stream live or recorded data.
• Wow. Thanks for the info! Cannot believe linking the GUI to serial was that simple.

  Now, it is to my understanding the baud rate for an arduino which I'm using should be around 9600, this doesn't not appear to be an option on the current widget, any suggestions on how to modify that?
• That was the only other thing I was going to mention: Baud rate. 9600 is on the slow side for Arduino (reference) , but I would stick with one of the rates offered by the OpenBCI GUI because the communication rates play nicely with how data is processed on the hardware level on Ganglion and Cyton. I would recommend editing whatever code you are using with your Arduino to increase the Baud rate.
• Additionally, is there anyway to manipulate data being streamed from OpenBCI GUI to the arduino so that the arduino itself can generate an output? Im a little lost in terms of how I can do anything with streamed data with arduino IDE (i.e. Measured alpha waves give value 'true' which can be taken by arduino code which then outputs a desired function)
• That involves programming within Arduino IDE and then uploading to your Arduino device.
• edited March 2018

  @Xp0, hi.

  Generally, experimenters do their signal processing on the laptop, since it has much advanced signal processing capabilities and libraries. Then send various 'commands' of your own devising to the Arduino over the serial port.

  http://openbci.com/forum/index.php?p=/discussion/1162/how-to-connect-to-arduino-board
  

  William
• Sounds like an interesting concept.

  My end-game here is to be able to manifest measured EEG using the ganglion into physical hardware, a task which seems well achievable with something such as an arduino.

  I have experience coding in the arduino environemnt so the fact that the OpenBCI hardware / software is arduino compatible was fantastic.

  By signal processing the data, do you mean sending the streamed data to other programs which then send outputs to arduino code?

  Or is there a method to create a value directly in the processing code that can be sent directly to arduino code which acts on a 'command' given?

  Thank you for your help.
• edited March 2018

  The networking widget does send the information directly to the Arduino over serial.

  @wjcroft is correct, a laptop running any number of programs will process signals better than whatever you can write in Arduino.

  As previously stated, you need to program the Arduino to perform an action regardless of where a signal is processed. Creating a new value within the OpenBCI GUI involves creating a widget. There are resources available on creating a widget and all code for the OpenBCI GUI is open source on Github.
• There are multiple ways to do this. I believe Chip in his hexbug and shark projects, modified the GUI to (for example) place thresholds on the values in the FFT bins. So if he was detecting alpha, he would be watching the FFT bins from 8 to 12 hz. Once those crossed a certain level for a sustained period of time, he would then send a serial command to the Arduino that was controlling the hexbug or shark.

  A more flexible approach with rapid prototyping can be done with VPL, Visual Programming Language environments such as BioEra, LabView, OpenViBE, Max / Puredata, etc. These frameworks let you setup chains of signal processing elements such as filters or ffts, thresholds, and provide feedback. Some of these VPLs support output to serial ports or calling external functions written in Java or C; which could then output arbitrary text commands to a serial port. For example if you were trying to control an LED (on the Arduino) to turn on or off, the serial commands might look like 'L0' or 'L1'.
• Thank you so much. I'll work a bit the concepts and see how that turns out.
• Hello! I understand that late, I apologize. But who can be useful again. I’m sending data from a com port via the ethernet using Serial over Ethernet. And it is possible to analyze and intercept data in real time using software to analyse serial port. I have been using them for a long time and I have enough of their functionality.
• Hello Zimmerman99,

  I actually ended up using a similar software myself to analyze serial data a couple of months back. Good recommendation nonetheless!

  For any users interested in connecting their OpenBCI to an arduino via serial port (usually its to test out the focus widget as that is a decent starter project),

  the networking widget must be connect to serial com port which the arduino is on. If you are connecting the focus widget, the GUI literally sends the string

  or

  over the serial port.

  In case that wasnt clarified to any folks newer to neurotech, that is what the focus widget sends.

  Onwards,

  The serial over ethernet communication looks very interesting, I'll make sure to try that out with the BCI in the near future!

  I'll make sure to make a more complete explaination on getting the arduino to read longer strings and act on them in a later post

  
  

  
  

  
  

  
  

  
  

You'll want to take a look at the documentation for. Two of the options there should work for you, depending on where serialEventHandler is with respect to your main code:.For functions in separate files: You will need to use variables to share your handles structure between them. Purple windows 10 background. In your main program: global handles%. Initialize handles.set(handles.s, 'BytesAvailableFcn', @serialEventHandler);% Don't have to pass itAnd in serialEventHandler: function serialEventHandler(serialConnection, )% Don't have to pass itglobal handles%. Rest of code.end.For functions in the same file: You can, allowing them to share access to variables without having to pass them as input or output arguments: function main%. Initialize handles.set(handles.s, 'BytesAvailableFcn', @serialEventHandler);% Don't have to pass it%.

Rest of main code.function serialEventHandler(serialConnection, )% Don't have to pass it%. SerialEventHandler code.endendThere is a third option as well (not mentioned in the above documentation on sharing data), but it could be substantially more work to implement: to use in place of your handles structure and deriving from the class to give it reference-like (i.e. Pointer-like) behavior. Although creating a new class would be more involved, it would allow you to pass your handles object to any function without having to return a modified version. Your code above would likely remain unchanged.