Happpyy Birthday! :p
I like your signature! It looks nice and I love Skyrush!
Coding it is not that complicated from what I've seen. It's really just one wire for speed, and 2 for directions. And power ofcourse.
Hey, I found something you might be interested in: High Current DC Motor Driver Module Board H Bridge PWM Signal Control New | eBay
Not sure if it's the best deal, but this is an approach that might be smart. This way you don't have to make the driver yourself. It might cost a few bucks more, but it will safe you a lot of hassle. When you buy this, all you will need to do is connect 7 wires to your motor/powersupply/arduino, and you're done.
That is the link to Skyrush, you said you could'nt find it so I found it for you!
Sounds cool! I hope you can solve all possible problems and get the coaster working.
Lives in the ghetto!
Well, I guess we're all now bloggers on SSC now!