while loop iteration in App Designer with Arduino

Hi,

So I have this code

if value == 1
                while value == 1
                    i = readDigitalPin(app.Output_Arduino,'D7');
                    if i == 1
                        app.ThrottleSW412Lamp.Color = 'g'
                    else
                        app.ThrottleSW412Lamp.Color = 'r'
                    end
                    pause(1/2)

                    ii = readDigitalPin(app.Output_Arduino,'D6');
                    if ii == 1
                        app.FlywheelMagPickup28Lamp.Color = 'g'
                    else
                        app.FlywheelMagPickup28Lamp.Color = 'r'
                    end
                    pause(1/2)
                end
                    % readDitigalPin(app.Output_Arduino, 'D6')
                    % readDitigalPin(app.Output_Arduino, 'D5')
                    % readDitigalPin(app.Output_Arduino, 'D4')
                    % readDitigalPin(app.Output_Arduino, 'D3')
                    % readDitigalPin(app.Output_Arduino, 'D21')
                    % readDitigalPin(app.Output_Arduino, 'D20')
                    % readDitigalPin(app.Output_Arduino, 'D19')
                    % readDitigalPin(app.Output_Arduino, 'D18')
                    % readDitigalPin(app.Output_Arduino, 'D32')
                    % readDitigalPin(app.Output_Arduino, 'D31')
                    % readDitigalPin(app.Output_Arduino, 'D30')
                    % readDitigalPin(app.Output_Arduino, 'D29')
                    % readDitigalPin(app.Output_Arduino, 'D28')
                    % readDitigalPin(app.Output_Arduino, 'D27')
                    % readDitigalPin(app.Output_Arduino, 'D26')
                    % readDitigalPin(app.Output_Arduino, 'D25')
                    % readDitigalPin(app.Output_Arduino, 'D24')
                    % readDitigalPin(app.Output_Arduino, 'D13')
                    % readDitigalPin(app.Output_Arduino, 'D12')
            end

as you can see that if I click the toggle button then the while loop starts which read the digital input from the Arduino and change the color or the lamp.

I truely believe that there has to be a way to iterate this instead of me adding the lamp and if statement for all pins. I have the pins read from excel file which I hope it would be easier since I might be able to use strcmpi and find function to fin the lamp name and then iterate it but I am not sure where to start my approach. If someone can suggest some ideas would be appreciated.

Thanks!

Answer 1

[Shubham]

Hey Min,

I understand that you wish to modify certain properties in a class within an iteration without the need of hardcoding it.

Based on your description of the query, I assume you have already stored the necessary data from the excel file into a table. You can simply extract the string containing the property names from the table and modify them accordingly. For instance refer to the following code snippet:

% Assuming you stored the reqd. info in a variable "data".
pins = data.Pin;
lamps = data.Lamp;

% Your loop iterations
while value == 1
    for k = 1:length(pins)
        pin = pins{k};
        lamp = lamps{k};
        pinValue = readDigitalPin(app.Output_Arduino, pin);
        
        % Update the lamp color
        if pinValue == 1
            app.(lamp).Color = 'g'; %you can use the string itself to access the property value
% Make apt changes as you need

For referencing the properties using variables, I suggest you to check out the highlighted section of the following documentation: https://www.mathworks.com/help/matlab/matlab_oop/defining-properties.html#mw_5f7e0964-b8f2-4350-a393-ec3cb4e115f8

I hope this helps!

[Min]

Hi Shubham,

I see that grabing the data from the variable 'data' will do the job but the problem is that each lamp must match with a specific pin. Will that not matter since the k iteration is grab all and reading the value from excel file and find the k iteration over and over?

[Shubham]

"the problem is that each lamp must match with a specific pin" : wouldn't the mapping for the lamp and pin be available in the excel sheet? I assumed that you have already stored the mapping in a table where lamps(i) and pins(i) would be a match.

"Will that not matter since the k iteration is grab all and reading the value from excel file and find the k iteration over and over?": Could you elaborate this query? I used a nested loop, because in your original post, you were checking each individual pin which could be done in a loop.

[Min]

I see, I did not fully understood the code that you had above.

Since they already match within the excel file it shouldn't be a problem with the iteration.

The second question I had was regarding the processing speed. I was wondering if have the find function to find the specific lamp name on the excel file and iterate that would be faster but since I need to read all of them, thus it wouldn't matter.

I will try this code and see how it works!

[Min]

Looks like it works! Thannk you!

[Shubham]

Glad to know your query has been resolved!