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Analog joystick: data is oscillating

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Hi, I built my own analog joystick using a 100K linear potentiometer. In my 3d application, I get data from it by DirectInput. It works, but the value received for a specific position is not always constant (it oscillates). Please, does anyone know why this happens and how to solve the problem? I wrote a filter, but this solution is good only in high fps. Thanks in advance.

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