Temperature controlled fan using Arduino

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i using arduino uno, temperature sensor(lm35), , 5 volt minfan. need suggestions on how set circuit board , output or inputs use on arduino. on how write program after have set up.
the objective fan change speeds according temperature sensor reads. instance, if sensor read low temperature fan should operate @ low speed , if read high temperature  fan should operate @ high speed.

how many times going ask same question? stop cross-posting.

there examples in playground temperature sensors. posted sketch on 1 of other threads.


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