Control all the graphical structure into two parts is that left and right are connected by a central shaft, so that the robot can move through obstacles.
Controlled by structures that will reflect into two parts: the left and right are connected by a shaft in the middle. The robot can move through obstacles better.
Control all the work by the structure that will indicate 2 into the left and right are connected ต่อกันด้วย shaft in the middle. So the robot can move through the barrier is even better.