In this mode, use buttons 1-9 to drive the robot in different directions. Note that the sketch still uses the IR emitter/receiver pairs to check for an obstacle in front. If you try to drive your Shield-Bot into a wall, it won't let you. Smart robot!
In this mode, the Shield-Bot uses its IR emitter/receiver pairs to roam autonomously and avoid obstacles.
In this mode, the Shield-Bot uses its IR emitter/receiver pairs to maintain a set distance from a stationary or moving object in front of it. The robot will follow your hand or another robot.