How to send data from MATLAB to Arduino an?

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Akarsh Sinha
Akarsh Sinha 2012-12-16
评论： Reyhane Jalil 2021-9-2
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)

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Jonathan
Jonathan 2012-12-18
编辑：Jonathan 2012-12-18
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.)
  2 个评论
Akarsh Sinha
Akarsh Sinha 2013-3-29
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
Break Freezy 2015-3-12
Please can you help me , i wanna send 4 data from matlab to arduino how to realise without taping in command of matlab ?

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更多回答（4 个）

Nthai Papala
Nthai Papala 2015-11-19
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
Rouis Jihene
Rouis Jihene 2017-7-20
编辑：Walter Roberson 2017-7-20
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.
Walter Roberson
Walter Roberson 2017-7-20
Change
fwrite(a,'%i',val);
to
fprintf(a,'%i',val);
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Rouis Jihene
Rouis Jihene 2017-7-20
Same problem! Do you have any other solution?(using Bluetooth or something else)

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Syahmi Noordin
Syahmi Noordin 2018-4-29
编辑：Syahmi Noordin 2018-4-29
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.
  1 个评论
Walter Roberson
Walter Roberson 2018-4-29
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.

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