The answer to this question really depends on what kind of motors you plan on using. If you're using plain ol' hobby motors or the likes of which that only have two wires, you might consider using an H-Bridge (http://www.robotroom.com/BipolarHBridge.html), which are pretty easy to make and only require a few relatively common parts. I used this method while building a robot arm and it worked well, but it would work even better if you had sensors to track the position of your wheel, arm, or what have you. There are plenty of tutorials across the web for nearly all motor types just a search away.
The answer to this question really depends on what kind of motors you plan on using. If you're using plain ol' hobby motors or the likes of which that only have two wires, you might consider using an H-Bridge (http://www.robotroom.com/BipolarHBridge.html), which are pretty easy to make and only require a few relatively common parts. I used this method while building a robot arm and it worked well, but it would work even better if you had sensors to track the position of your wheel, arm, or what have you. There are plenty of tutorials across the web for nearly all motor types just a search away.
As a sensor for our robot arm we are using poteniometer, it resolution good for us and it is realy cheap option. Ofcorse you can use encoders, but it is harder to monittor them and they are more expensive.
