
542 Chapter 28 • Searching for Precision
simple front bumper, because they were too lightweight and slippery to exert any
pressure on the touch sensor.We saw many different techniques offered as solu-
tions to this: Our robot, the one shown in Chapter 11 (Figure 11.12), used a top
bumper activated by the height of the cube. Other competitors adopted different
harvesting systems—for example, a sort of gate that closed when a cube was
inside, or a lever that blocked the cube against one side of the robot.
Most of the robots based their search for the cubes on a purely random navi-
gation, while the more sophisticated ones used a limited knowledge of their ...