Help with GUI matlab to control a servomotor

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FRANCISCO JOSÉ DEL MORAL CONDE 2020-4-23

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https://ww2.mathworks.cn/matlabcentral/answers/520276-help-with-gui-matlab-to-control-a-servomotor

评论： FRANCISCO JOSÉ DEL MORAL CONDE 2020-4-23

Hi, I would like to know if someone could help me to solve this error: "MATLAB connection to Uno at COM3 exists in your workspace. To create a new connection, clear the existing object."

I am working with a slider to move a servomotor and I don´t know how to solve it, I have tried to "clear all" in the last line of the function and it still no working. This is the code:

% --- Executes on slider movement.

function slider1_Callback(hObject, eventdata, handles)

global position

global pos

position=get(handles.slider1,'Value');

pos=double(position);

assignin('base','pos',position);

a = arduino('COM3','Uno','Libraries','Servo');

assignin('base','arduino',a);

s = servo(a,'D2');

assignin('base','s',s);

writePosition(s,pos);