Rotation counter and motor shut off for yarn skein winder

hello everyone,

advance can here! i'm very new arduino have been reading years amazing things can do.

i'd build wife skein winder. what's ask? skein winder spins take yarn off spindle create called skein (which specific length of yarn). 

the skein winder plan on building this:
http://www.fricke-fiber-tools.com/electricwinders.html

now my question: can use arduino count rotations of winder , stop motor? function allow repeatedly make skeins of consistent length.

i feel deep in gut out there has answer or @ least direction look. appreciated!

hello,

short question "can done"? short answer "yes".

longer answer, 1 puts magnet on part turning (in case, wheel skein being built onto). then, put magnet sensor. can called hall effect or magnetic reed switch.  every time magnet passes sensor/switch, generates input digital input pin on arduino.

another technology not use "simple" dc motor called stepper motor. more expensive arduino can tell them take step. takes 200 such steps equal 1 rotation arduino in fine control of how fast/often device spins.

whether use simple dc motor or stepper motor, can't power directly arduino. arduino pins can supply 20 ma of power. need transistor or mosfet or (for stepper) controller that.

using key words answer, find thousands of suggestions on forum on how proceed.

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