MATLAB: How to model sun-sensor photocell

photo-cellsimulinksun-sensor

I am new to simulink and trying to model a sun-sensor for attitude control which uses a photocell to generate the current based on intensity. Is there any way to model the same in simulink.

I found a photodiode sensor but it's with the sensors toolbox which I don't have access to. Is there way to model that.

Thanks in advance.

Best Answer

Hi Divas,

In order to do physical modeling of sensors, you would need to use Simscape (and potentially SimElectronics depending on the sensor)- the specific capability that you are asking about does not exist in base Simulink. Hope this helps!

-Cindy

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I'd take an image with the sun in view and then find out how bright it is and it's size. Then threshold the image and look for items roughly that bright and that size.

grayImage = rgb2gray(rgbImage);
binaryImage = grayImage > someValue; % someValue is some value that the sun is ALWAYS brighter than.
[labeledImage, numBlobs] = bwlabel(binaryImage);
props = regionprops(binaryImage, 'Area');
allAreas = [props.Area]
sunBlobs = allAreas >= minAreaForSun & allAreas <= maxAreaForSun;
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else
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    fprintf('No Direct Sun at %s\n', datestr(now));
end

Attach photos of "with sun" and "without sun" if you need more help.

Best Answer

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