The Miniskybot was designed to work with 2 different boards, Skypic and Arduino UNO. If you have used this robot with Arduino UNO you would probably have noticed that 4 AAA batteries aren't enough to make this board work properly, so here's a modification which include a bigger battery holder (x6 AAA Batteries), and a bigger chasis. The wheels are the same as in the original design, you can find it here: http://www.iearobotics.com/wiki/index.php?title=Miniskybot_2