Short-circuit detector on Arduino

Hello, I need help on how to solve the issue of short circuit detection on a given output of the system. I am constructing a power supply for a laser diode and I wanted to create 5 separate outputs for different models of diodes (depending on which input will be plugged in, the program will adjust the maximum output current).
I thought about connecting pins from digital/analog inputs to each output, but I don't know how to solve the problem (detection by high or low state does not work).

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@gacusx ,
Please post in English in the English section of the forum. Unfortunately there is no Polish section but there are several other languages available, please use whichever is best for you, or use a translator if you only know Polish.

I have moved your topic to a more suitable place in the forum.

Thanks you.

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