Let's Make Robots!

Arduino Motor Driving Circuit.... What do you think?

I have one I/o pin going to a relay dpdt http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=843649 i then determines forwards or reverse. Then a second I/0 line to a NPN transitor to turn the motor of or on. This would have the capability of just forwards reverse and off. This is good because it takes on two i/o lines and is able to have just those parts because the coil would be able to run of the  40 mA the arduino pin can source

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Does arduino have I2C? Keep an eye on http://letsmakerobots.com/node/655 where an I2C 12V 20A dual channel motor speed and direction controller will shortly emerge.