Arduino on Matlab within Ubuntu 14.04

Hi, I installed Matlab 2015b on Ubuntu 14.04 => Works fine. Then also installed the Arduino support package => No warnings or errors...

Yesterday, I wanted to connect the Arduino UNO:

 a = arduino('/dev/ttyUSB0')

what resulted in an error. I tried this answer and made the java file. That did not work. I find the arduino when I list the USB ports. It says Bus 007 Device 002 ... Arduino UNO R3. And in the device list I find the corresponding file which properties gave me the "/dev/ttyUSB0" address.

Has anybody a hint I could try?

[Andreas Schmid]

these two messages appear, even though I have a file called "java.opts" in Matlab's startup folder.

>> a = arduino('/dev/ttyACM0','Uno')

Failed to open serial port /dev/ttyACM0 to communicate with board Uno. Make sure there is no other MATLAB arduino object for this board. For troubleshooting, see Arduino Hardware Troubleshooting.

>> a = arduino('/dev/serial/by-id/ttyACM0','Uno')

Cannot find Arduino hardware on port /dev/serial/by-id/ttyACM0. Make sure Arduino hardware is properly plugged in. Otherwise, please specify both port and board type. For more information, see arduino function reference page.

[Juan Reyes]

I have the same problem but with a Mega2560 clone. I already updated the firmware but still nothing!

[Juan Reyes]

I got it here! https://github.com/nhahn/gripitgood/tree/master/arduino_serial_control

Linux, create a symbolic link as follows:

sudo ln -s /dev/ttyACM0 /dev/ttyS101

and make sure it is accessible by any user:

sudo chmod 777 /dev/ttyS101

Forgetting this last step might lead to a serial port which is unaccessible by a normal user (therefore being grayed-out in the IDE).

From MATLAB, launch the command arduino ('/dev/ttyS101', 'Mega2560')

...It worked for me...cheers!

[Andreas Schmid]

Thank you Juan, I tried all this, but in the end it did not work out. I was in contact with Mathworks support and they found out that in my Ubuntu distribution one package was missing.

So in the end this worked out:

Install the Matlab Arduino-Kit Install the missing Arduino dependencies: sudo apt-get install openjdk-6-jre avr-libc gcc-avr Create the symbolic link: sudo ln -s /dev/ttyACM0 /dev/ttyS100 Create a file called java.opts in the folder where Matlab starts (To find out where this is, start Matlab and type

pwd

in the command line)

The file tells Matlab where to find the connection, so this line must be contained: -Dgnu.io.rxtx.SerialPorts=/dev/ttyS100:/dev/ttyACM0

That's about it :-)

[wei shulin]

Hi,Juan Reyes thank you for your help , it really helps me out.

Answer 1

[marwa diwiny]

Please I need the help, I tried many times, but in vain, I don't know where is the problem and it can't recognize the arduino functions

>> a= arduino('/dev/ttyACM0')
The port /dev/ttyACM0 is already used by MATLAB
If you are sure that the board is connected to /dev/ttyACM0
then delete the object, execute:
  delete(instrfind({'Port'},{'/dev/ttyACM0'}))
to delete the port, disconnect the cable, reconnect it,
and then create a new arduino object
Error using arduino (line 54)
Port /dev/ttyACM0 already used by MATLAB