How to use the Arduino with MATALB software

I installed the MATLAB support package for Arduino Hardware but am unable to communicate with my arduino Uno. When setting up the board it says that the connection is good. However, when I try to use the example code below it does not work.

a = arduino();

I get the following error:

No constructor 'string' with matching signature found.

[Nicole Segale]

I am having the same problem. Were you able to fix this?

[Kyle Vrtis]

same issue here. really annoying.

[Esc]

Im having the same problem, no idea how to fix it. Im using mac OS Monterey.

[Rachel Mannasse]

Did you ever fix this problem?

[Elise Lutz]

I'm having the same issue with no luck :(

Answer 1

[Florian]

Hi, as I had the same issue with my 2022b instalation, maybe my solution will help someone.

instead the non working

a = arduino()

use auto suggestion after the first bracket (TAB ) to input something like:

a = arduino("/dev/cu.usbmodem144301","Nano33IoT") %the pink stuff should be different for you 

And now, at least for me, there is no error message

Answer 2

[Walter Roberson]

Which MATLAB release are you using?

What shows up for

which -all String
which -all string

The error message you are getting most commonly occurs when you are using a file system that is not case sensitive (NTFS and Apple HFS+ by default are not case sensitive), and you have a function defined with the other cases than the class you are trying to invoke. So in this case, if you had a String.m on your MATLAB path that was earlier than MATLAB's @string folder, then the String.m might get matched because the file system is not case sensitive, but then MATLAB internally compares the String name to the desired string and sees they are different and gives the error message you indicated.

[Kyle Vrtis]

A year later, but I am having the same issue. I am using 2021b on MacOS Big Sur.

which -all String

/Applications/MATLAB_R2021b.app/toolbox/matlab/strfun/@string/string.m % string constructor

/Applications/MATLAB_R2021b.app/toolbox/matlab/datatypes/@opaque/string.m % opaque method

/Applications/MATLAB_R2021b.app/toolbox/matlab/bigdata/@tall/string.m % tall method

/Applications/MATLAB_R2021b.app/toolbox/matlab/codetools/@mtree/string.m % mtree method

/Applications/MATLAB_R2021b.app/toolbox/matlab/datatypes/categorical/@categorical/string.m % categorical method

>> which -all string

string is a built-in method % string constructor

/Applications/MATLAB_R2021b.app/toolbox/matlab/datatypes/@opaque/string.m % opaque method

string is a built-in method % matlab.indexing.IndexingOperationType method

string is a built-in method % matlab.indexing.IndexingContext method

/Applications/MATLAB_R2021b.app/toolbox/matlab/codetools/@mtree/string.m % mtree method

string is a built-in method % pattern method

/Applications/MATLAB_R2021b.app/toolbox/matlab/datatypes/datetime/@datetime/datetime.m % datetime method

string is a built-in method % matlab.internal.doc.services.DocLanguage method

string is a built-in method % message method

string is a built-in method % connector.internal.LoggerLevel method

string is a built-in method % connector.internal.PromiseState method

string is a built-in method % mtree.Type method

string is a built-in method % matlab.net.ArrayFormat method

/Applications/MATLAB_R2021b.app/toolbox/matlab/external/interfaces/webservices/http/+matlab/+net/+http/MediaType.m % matlab.net.http.MediaType method

/Applications/MATLAB_R2021b.app/toolbox/matlab/external/interfaces/webservices/http/+matlab/+net/+http/HeaderField.m % matlab.net.http.HeaderField method

/Applications/MATLAB_R2021b.app/toolbox/matlab/external/interfaces/webservices/http/+matlab/+net/URI.m % matlab.net.URI method

/Applications/MATLAB_R2021b.app/toolbox/matlab/external/interfaces/webservices/http/+matlab/+net/QueryParameter.m % matlab.net.QueryParameter method

/Applications/MATLAB_R2021b.app/toolbox/matlab/external/interfaces/webservices/http/+matlab/+net/+http/+io/ContentProvider.m % matlab.net.http.io.ContentProvider method

string is a built-in method % matlab.internal.lang.capability.Capability method

string is a built-in method % matlab.lang.OnOffSwitchState method

string is a built-in method % matlabshared.hwsdk.internal.BluetoothDeviceTypeEnum method

string is a built-in method % matlabshared.hwsdk.internal.ConnectionTypeEnum method

string is a built-in method % matlabshared.hwsdk.internal.WiFiEncryptionTypeEnum method

string is a built-in method % viewmodel.internal.factory.ManagerFactoryProducer method

string is a built-in method % mf.zero.meta.Language method

string is a built-in method % appdesservices.internal.peermodel.BrowserControllerFactory method

string is a built-in method % appdesservices.internal.peermodel.ValueConverterType method

/Applications/MATLAB_R2021b.app/toolbox/matlab/datatypes/missing.m % missing method

string is a built-in method % arduinoio.sensors.apds9960.Gestures method

string is a built-in method % matlab.hwmgr.internal.hwsetup.StatusIcon method

string is a built-in method % matlab.ui.container.internal.appcontainer.AppState method

string is a built-in method % matlab.ui.container.internal.appcontainer.AppWindowState method

string is a built-in method % arduinoioapplet.internal.FormFactorTypesEnum method

/Applications/MATLAB_R2021b.app/toolbox/matlab/helptools/+matlab/+internal/+doc/+url/DocPage.m % matlab.internal.doc.url.DocPage method

string is a built-in method % matlab.internal.doc.url.ContentType method

string is a built-in method % matlab.io.xml.xpath.EvalResultType method

string is a built-in method % matlab.desktop.editor.RtcEditorState method

string is a built-in method % matlab.internal.editor.ErrorType method

/Applications/MATLAB_R2021b.app/toolbox/matlab/bigdata/@tall/string.m % tall method

/Applications/MATLAB_R2021b.app/toolbox/matlab/datatypes/categorical/@categorical/string.m % categorical method

/Applications/MATLAB_R2021b.app/toolbox/matlab/strfun/@string/string.m

[Walter Roberson]

I think it might help to

dbstop if error

and run the code, and see how far it gets, see which line is triggering the error. And at that point

which string
path

with the path there intended to check whether somehow the matlab path got badly mangled

[Esc]

After doing the dbstop if error it lands on this line: throwAsCaller(e);

[Walter Roberson]

@Esc

Try with

dbstop if caught error

[Dylan McSweeney]

>> a = arduino();

No constructor 'string' with matching signature found.

>> which -all String

/Applications/MATLAB_R2022b.app/toolbox/matlab/strfun/@string/string.m % string constructor

/Applications/MATLAB_R2022b.app/toolbox/matlab/datatypes/@opaque/string.m % opaque method

/Applications/MATLAB_R2022b.app/toolbox/matlab/bigdata/@tall/string.m % tall method

/Applications/MATLAB_R2022b.app/toolbox/matlab/codetools/@mtree/string.m % mtree method

/Applications/MATLAB_R2022b.app/toolbox/matlab/datatypes/categorical/@categorical/string.m % categorical method

>>

>> dbstop if caught error

>> a = arduino()

Caught-error breakpoint was hit in base>base.addprop at line 0. The error was:

'dhardwareInstance' is already defined as a property.

In workspace belonging to arduino

K>>

Answer 3

[Zoltán]

Same for me, seems to be an Apple Monterey problem.