How to send data from MATLAB to Arduino an?

Hi, I was wondering how do I send data from MATLAB , say a number ,5 to my Arduino board. The board contains some code in it. For simplicity lets assume it multiplies the incoming number with 4. The output , 20 ,should be displayed in the command window. Is this possible ? I know about a.roundTrip('data') function. But the one in my query is something different. (I work on R2010a)

[Josh]

I have this same exact question. Any answers?

[Akarsh Sinha]

Josh. Try Arduino IO Package . http://www.mathworks.in/matlabcentral/fileexchange/32374-matlab-support-package-for-arduino-aka-arduinoio-package

Answer 1

[Jonathan]

I suppose you could do it through serial connections. If you have a serial port (or a serial to USB adapter and driver) you can create and open a COM object in MatLab to communicate with the Arduino board (usually arduino terminals D0 and D1 are serial TX/RX).

The code would be something like:

 arduinoCom = serial('COM3','BaudRate',9600 . . . );  % insert your serial
                                                           %properties here

 sendData = 5;
 fopen(arduinoCom);
 fprintf(arduinoCom,'%i',sendData); %this will send 5 to the arduino
 fscanf(arduinoCom)    %this will read response
                       %or use BytesAvailableFcn property of serial

You will have to look into using the correct terminators and do a bit of configuration with that. Let me know if this makes sense. Usually terminators are something like a linefeed / carriage return or an symbol (*, $, etc.)

[Akarsh Sinha]

Thanks Jonathan. I've figured out another way to do it. The Arduino IO Package works perfectly.It allows you to use Simulink too.

[Break Freezy]

Please can you help me , i wanna send 4 data from matlab to arduino how to realise without taping in command of matlab ?

Answer 2

[Nthai Papala]

I need assistance. I need to send a binary data, say random bits (1 byte for example) from one computer to the other using LED and a phototransistor. The data must be generated in matlab and be sent over a serial port through arduino. I am using matlab 2015a and Arduino Uno and i need codes for both Arduino and Mat Lab.

Thanks in advance

[Walter Roberson]

Please open a new Question for this.

[Busra AYDIN]

hi, did you solve your problem?

[Reyhane Jalil]

hi i have same project ...can you send me detail of your [e-mail]

Answer 3

[Rouis Jihene]

Hello,

I want to send a value from matlab to arduino,i tried this code but it doesn't work:

in Arduino:

void setup() {
 Serial.begin(9600);}
void loop() {
 if (Serial.available()) {
    Serial.println(Serial.read());}
  }

In matlab:

a=serial('com7');
val=20;
fopen(a);
fwrite(a,'%i',val);
fclose(a);

Do you have any solution ? Please help and thanks.

Answer 4

[Walter Roberson]

Change

fwrite(a,'%i',val);

to

fprintf(a,'%i',val);

[Rouis Jihene]

same problem!!! :( In this code, should i precise RX and TX pins?

[Walter Roberson]

No, it is not possible to specify the RX or TX pins for serial ports. RX and TX pins are part of the hardware interface level: you either wired them through the right way or you did not wire them through the right way.

The fact that you used COM7 suggests to me that you might be using a USB to serial convertor. If so then likely the correct wires have already been used.

Are you able to talk to the ardiuno if you use the arduino() command? https://www.mathworks.com/help/supportpkg/arduinoio/setup-and-configuration.html

[Rouis Jihene]

Yes, i'am able to talk with Arduino using arduino() command, there is no problem in this point.

[Rouis Jihene]

Do you know what's the most weird thing, that i'am able to send value from arduino to matlab without having any problem ! Do you believe in this ? Is it logical ?!

[Walter Roberson]

Try

fprintf(a,'%d\n',val);

[Rouis Jihene]

Same problem! Do you have any other solution?(using Bluetooth or something else)

Answer 5

[Syahmi Noordin]

Hi, I want to ask about how to transfer more than one value from matlab GUI to arduino? I put 3 edit text functions in the Gui so I want the user to input value in each edit text function and those three values must be send to arduino for further calculation. Thanks.

[Walter Roberson]

get() the String property of the handles. fprintf(a, '%s %s %s\n', str1, str2, str3) where a is the arduino connection. This assumes that you want spaces between the strings and newline after the group of three.

You should probably do some sanity checking to be sure the strings are not empty and represent valid numbers.