serial communication problem is not working in .mat file

hi i want send 1 and 0 to arduino from matlab with usb and blink the led when 1 receveing and 0 receceing it is not blink my code be like

s = serialport("COM10",9600);

writeline(s,'1');

clear s

when i am sending from matlab command prompt is sending and bliking the led and when i am send it from .mat file script it is not working any can help the slove the problem

[Mustafa Codur]

Hello,

the following link includes solution of your problem.

https://www.mathworks.com/matlabcentral/answers/706318-writeline-function-does-not-work-in-script-problem?s_tid=prof_contriblnk

Answer 1

[Ameer Hamza]

You should not clear the serial object without closing and deleting it first. It is probably happening that you opened the serial object and then deleted the variable. Now it is open in the background, and you cannot connect to it again with s = serialport("COM10",9600). You should first delete all the serial objects.

delete(instrfind)

Then run the script, and always remember to close the serial object after use

s = serialport("COM10",9600);
fopen(s)
writeline(s,'1');
fclose(s)

[gugu bubu]

i tries as you said but it is showing error like

Error using fopen

First input must be a file name or a file identifier.

Error in untitled (line 58)

fopen(s)

[Ameer Hamza]

Have you defined s by running

s = serialport("COM10",9600);

[gugu bubu]

no , when i am using fopen(s) and fclose(s) withs= Serial port ("com10",9600) it is showing error but when s=serial("com10","BaudeRate",9600) useing fopen(s) and fclose(s) are not showing error but led is not blinking

[Ameer Hamza]

Try running following lines together

delete(instrfind)
s = serialport("COM10",9600);
fopen(s)
writeline(s,'1');
fclose(s)

If you don't get any error than MATLAB is working fine. You need to check the programming of your arduino.

[gugu bubu]

yes i am running those lines are together but it is showing error

[Ameer Hamza]

Then arduino might not be connected properly to your PC. Or it is connected to some other port. Try finding the correct port number "COMxx".

[Walter Roberson]

serialport() objects cannot be fopen() or fclose() -- those apply to serial() objects, not to serialport() objects.

[Catarina Campos]

@Walter Roberson im sorry to bother, but how do you open and close a serialport object then?

[Walter Roberson]

serialport objects are automatically opened and cannot be closed, and must instead be deleted to close them.

You can tell that whoever designed the interface never did any serious dial-up work, and that whoever approved the interface was not concerned about Mathworks losing users to other more serious device control products.

Answer 2

[Mustafa Codur]

Hello,

the following link includes solution of your problem.

https://www.mathworks.com/matlabcentral/answers/706318-writeline-function-does-not-work-in-script-problem?s_tid=prof_contriblnk