Hello guys, please help me to solve the below mentioned error regarding clearing arduino object

please do help me ASAP.

Answer 1

[Darshan Teraiya]

[y,fs]=audioread('Blank Space.mp3');
a = arduino('COM3','UNO');
x = writeDigitalPin(a,'D13',1);
if x==1
       sound(y,fs)
else
     clear sound;
end
clear a; 
clear x;
%%Error using morning_alarm (line 2)
MATLAB connection to Arduino Uno at COM3 exists in your workspace. To create a new connection, clear the existing object.

Answer 2

[EngEdgarHS]

Hi, you cannot use x this way. If you are using pin 13 as digital output, try:

x = 1;
writeDigitalPin(a, 'D13', x);

but if you want to read state of this pin as digital input (I think you want to do this by the format of your code), try:

[y,fs]=audioread('Blank Space.mp3');
configurePin(a,'D13', 'digitalInput');
x = readDigitalPin(a,'D13');
if x==1
       sound(y,fs)
else
     clear sound;
end

For clear Arduino object, try it:

clear board;
if ~isempty(instrfind)
    fclose(instrfind);
    delete (instrfind);
end
clear a;

Good luck.