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you don't need a larger arduino, but you do need a driver for stepper or dc motor.like a uln2003 for small motors like 28byj .If it draws more current then you need L298N.Search google with this to get better idea - https://www.google.co.in/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=stepper%20driver%20ic
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