I remembered a long time ago my parents got me the Lego Robotics Invention System. Then years later I traded the computer for something. But I still have all the gears and wheels and everything. I thought it would be simple to integrate the motors to arduino. But I went back home and found that the motors are gone too, I must've traded them as well. But I still have all the gears and wheels. The motors cost an arm and a leg on ebay but there are new ones that are about $8 new. They appear to be compatible with my gears and wheels but they use a 4 wire system and I don't want to invest in them until I know I can use them with arduino. The only info I could find about them is here. It says there is constant power to the motor as well as support for the past systems. I guess that means with some experimenting I could at the very least get them running like the old ones. But I would first like to get some advice as I have never dealt with motors. And if anyone has more info on these motors I would appreciate it. Should I have any trouble getting these things running?