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Automatic Potentiometer Answered

Hi!  i need and automatic potentiometer it has to works max 5v i thouhgt about that and i can make it manually but it's to big and to weird  i want to ask you a form to make  it whit electronic components or a component ho can makes it i want to make a motor acelerates and desacelerates whith a soft curve and if its posible put the time of the cycle (example 40 seconds acelerat.... and .. desaceler...."cycle" or similar)

Thanks Sorry for my bad english! Thanks! 


Program an arduino with a motor shield. You can search for the ibles on that.

I don't know anything about arduino i only know they are awesome.Do you know what kind of arduino i need and what codes?