Button issues on Arty S7-50.

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I'm using Arty S7-50 boards for a lecture.


By using simple edge detecting logic, I build a program which counts the number of button click. 

But board's button doesn't work stably such as counting twice by one click or counting increase while keep pushing the button.


I applied several button denouncing logic, but can't solve the issue perfectly.

So i guess buttons on the board convert its signal while while it is pressed.

I have 30 boards of the same kind and they all have same problem.


I'm wondering whether there is any other report on this issues.  

By your answer, I need to  change my grading policy.



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