Which sensor for a wheel

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hi,

this first project arduino. need attach small cardboard wheel arduino (10 cm) , receive signal every time cardboard moves.
the wheel can move in 1 way. potentiometer choice need unlimited rpm.
which sensor have use?

thank much,
daniele

hi, daniele.
sorry, request not clear me...
do want attach piece of cardboard 10 cm wheel? or wheel made of cardboard? 10 cm diameter? attach arduino?
and want measure change of state (from stop movement, , movement stop), or rotational speed?
rgds,


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