• Matlab Serial Port
• Matlab Plot Serial Input
• Matlab Read Serial Input
• Matlab Code For Serial Input From Arduino
• Matlab Serial Plot
• Matlab Wait For Serial Input
• Matlab Flush Serial Input Buffer

1. Apr 02, 2016  Using MATLAB to display streaming serial data.% There may be more than one row of source data in the serial input buffer at% the start of the main program loop. Any of these rows may be incomplete, so% the first thing the main program does is to check that the data contains the% expected number of entries. Matlab serial data display.
2. Oct 12, 2018  Serial Communication using MATLAB GUI. For demonstrating the Serial Communication using MATLAB GUI, we will create two graphical buttons using MATLAB to turn on and off the LED connected to the Arduino. Data will be sent serially from MATLAB to Arduino on clicking on these buttons to turn on and off the LED.
3. For many serial port applications, there are three important questions that you should consider when writing or reading data. To transfer the data from the input buffer to MATLAB, use one of the synchronous (blocking) read functions such. Write and read data — Write the RS232? Command to the instrument using fprintf, and then read back.

I have written an m-function to capture and plot a 50Hz serial data stream. This works as expected, bar the fact that there is a large (approximately 10 second) delay before any changes in the data stream are reflected in the plot.

The m-function uses the serial data stream design pattern, and the plot is configured to resemble a strip chart. The MATLAB recommendations for optimizing graphics performance have been followed, with YData being updated using get/set methods rather than data being replotted.

Now, either there is something wrong with my code, or I have reached the limit of what MATLAB is capable of doing without using the real-time windows target. Can anyone spot what I am doing wrong? I am considering implementing a USB interface on the embedded system that is streaming the data that MATLAB is plotting, but I am not convinced this will fix the problem.

2 Answers

I posed the original question some time ago, and neglected to post the answer when I found it - sorry about that. For those who are interested, it turns out that the 10 second delay was being caused by an error in the way that I was setting the XLim and Xtick properties of my axes. Replacing the following code fragment:

This example shows how to set the input buffer size for a serial port object. The InputBufferSize property specifies the total number of bytes that can be stored in the software input buffer during a read operation. By default, InputBufferSize is 512 bytes. There could be a case when you would want to increase it to higher than the default size. Sep 06, 2017  How to create a 3D Terrain with Google Maps and height maps in Photoshop - 3D Map Generator Terrain - Duration: 20:32. Orange Box Ceo 8,192,162 views. Jun 21, 2019  In the given code, below command is used for defining the serial communication in MATLAB. Make sure the com port number is the port number on which Arduino is connected and the baud rate should be set same in the both the codes of Arduino and MATLAB. Jul 04, 2011  In this tutorial I will show you how to communicate matlab with arduino through the serial port. With what you’ll learn here you will be able to send data from your sensors to your computer and process it however you want using MATLAB’s power functions.

With this one:

eliminated the 10 second delay. As is usually this case, solving one problem exposed another, more fundamental one. It appears that MATLAB is simply incapable of recording a 57600 serial data stream without dropping samples. This behavior was verified with code similar to that posted above (ie GUI code), as well as a cut-down, command-line version with no GUI at all. The number of samples dropped varied from run-to-run, but sat around 7 per minute, ie 7 per 3000 samples. I then wrote some LabVIEW code to do the same thing, and it did not drop a single sample, no matter how many hours I left it running for. The lesson I draw from all of this is that MATLAB is great for analyzing data, but is not so good for acquiring it. That is a task best left to LabVIEW, or dSPACE.

I had similar problems. For me it was delay introduced by serial connection overflow. Try to lower the sample rate and rise the baude rate. See:

and

Matlab Serial Port

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This is my code:

This is the CallBack function

end

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Right after the FOPEN function, I get this Warning:

The BytesAvailableFcn is being disabled. To enable the callback property either connect to the hardware with FOPEN or set the BytesAvailableFcn property.

Does the logic that happens in the callback function Serial_OnDataReceived run on a different thread?

Matlab Plot Serial Input

Is there a way to pass parameters to the function? Ie8 for windows xp sp3. I want to modify an array in the main script from the callback function, which is in a different file. What's the best way to do so?I am also trying to plot the values when they're updated to show some kind of dynamic animation.

2 Answers

I am not sure about what is generating the warning, but to answer your other question (how to pass parameter to the callback and how to update the plot), a better way to go would be to prepare your plot outside of the callback, then pass the handle to the callback for update only.

Your callback will become:

Also note: (1) You don't need to check for the state open/close of the serial port within the callback function. If the event was triggered it means the port was open. (2) you don't need to declare s as global, the obj parameter is actually the serial object itself.

Matlab Read Serial Input

Matlab Code For Serial Input From Arduino

If the suggestion from Hoki does not work, try using a timer.

Matlab Serial Plot

Then implement the timer function that will be called every period

When you want to disconnect the device and close the communication don't forget to stop the timer with

Matlab Wait For Serial Input

Matlab Flush Serial Input Buffer

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