Help with Arduino, motors!

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hello,
i making robot crossing guard. when robot senses motion (pir sensor), play low note on piezo buzzer, , light red led light. pir sensor runs on 5v. , motors run on 6v. problem have jumpers , input cables plugged arduino. , motor shield operate, need pins on arduino available. dad says of them needed motors operate power 2 motors, bought special seeed cables. how can this?
seeed motor shield:
http://seeedstudio.com/wiki/motor_shield_v1.0

(message me if want see source code)

thanks,
mac



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