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http://www.tigoe.net/pcomp/code/category/code/arduinowiring/51
http://www.tigoe.net/emailclock/mailclock1.shtml
http://www.arduino.cc/en/Reference/StepperBipolarCircuit
http://www.sparkfun.com/commerce/product_info.php?products_id=99
http://www.thisispete.com/weatherclock/
http://www.makingthings.com/documentation/how-to/stepper-motor