App Designer - timer with random interruption

Hello, maybe somebody know what is not working correct.

I implanted a timer (replaced a loop) for measurements my motor data. But sometimes if I increase/decrease with a spinner my velocity of the motor, the timer finished before I push the stop bottom. It happen always randomly. I guess something is affecting each other but I don’t know what. Maybe anyone has an idea?

Thanks a lot :)

methods (Access = private)

    function MemoryTimerFcn(app,~,~)
    
                    % read my data (now I just put two inside=
                    app.actualVelocity.Value = webread()
                    app.actualMotorCurrent.Value = webread()                               
    end     
    % .....a lot of other functions
    
 end 
    
    
    function startupFcn(app)
    app.MemoryTimer = timer(...
    'ExecutionMode', 'fixedRate', ...    
    'Period',0.2, ...                   
    'BusyMode', 'drop',...             
    'TimerFcn', @app.MemoryTimerFcn);  
     end
    
    function MotorON(app, event)                                            
     start(app.MemoryTimer);
    end                     
                            
    function MotorOFF(app, event)                                   
     stop(app.MemoryTimer);
    end

[Geoff Hayes]

Chris - can you show where you call MotorON and MotorOff? Is the second function only called when you want to stop the motor (how do you know when to call this?) and is this function the only way to stop the timer? Also, how do you know that the timer has stopped prematurely - is there some sort of indication in the console (or whatever) output?

[Chris]

Hello Geoff, thanks for helping me, sorry for my late answer.

I called the MotorON, MotorOFF with two Buttons. Yes for e.g. my measurements stop sometime if change my velocity value with a spinner.

I change already a lot of things, but I still have my problems with Timers. I guess they affect each other so they jumped out and worked in another process and than continuous.

Now I have already 4 timers:

• measurements (is working almost the whole time)
• live plotting data (Start/Stop - Button)
• heartbeat (all the time) to check the communication with my motor control is existing
• profile drive, read data from excel (velocity over time) and send them to my motor controller

The code is just an extract:

methods (Access = private)

    function MemoryTimerFcn(app,~,~)
        app.actualVelocity.Value = webread()
        app.actualMotorCurrent.Value = webread()                               
    end     
  
    function MemoryTimerFcn2(app,~,~)
       %plotting my acutual data, Start/Stop Buttons
    end
    
    % send new velocity data (table) after time delay is over
    function MemoryTimerFcn3
    
        app.timerDelaySecs = app.X;
        
        app.MemoryTimer3 = timer(...
         'StartDelay',app.timerDelaySecs,...
        'ExecutionMode', 'singleShot', ...                    
         'BusyMode', 'queue',...              
        'TimerFcn', @app.MemoryTimerFcn3);    
    
        if (app.count <= size(app.data,1))
            start(app.MemoryTimer3);
        else     
            MotorOFFButtonPushed(app)           
        end 
    end 
    
end      
---------------------------------------------------------------------------
 
function startupFcn(app)  

        % measurements
        app.MemoryTimer = timer(...
                'ExecutionMode', 'fixedRate', ...    
                'Period',0.2, ...                    
                'BusyMode', 'queue',...              
                'TimerFcn', @app.MemoryTimerFcn);    
        % live plotting data     
        app.MemoryTimer2 = timer(...
                'ExecutionMode', 'fixedRate', ...    
                'Period',0.2, ...                    
                'BusyMode', 'queue',...            
                'TimerFcn', @app.MemoryTimerFcn2);    
        
        % heartbeat, started here
         app.MemoryTimer4 = timer(...
                'ExecutionMode', 'fixedRate', ...    
                'Period',3, ...                    
                'BusyMode', 'queue',...            
                'TimerFcn', @app.MemoryTimerFcn4); 
         
         start(app.MemoryTimer4); 
            
end            

Thanks for helping :)