Be on the lookout

Identifying when a command in a sensor watcher stack changes behavior achieved by a command in the Main Program.

What you can do: Ask students what they expect the robot to do as soon as the sensor is pressed. In this case, the intuitive and correct answer is “reverse direction.”

Important Note: Many students use an On For 3 block instead of a Wait For 3 block. Doing so turns off the motors, requiring another On AC command to be added later in the stack.

Do students need a reminder about how to make a vehicle turn?

Remind them the 2 motors are on and ask what needs to be done to make it turn. Here, since both are on, one has to be turned off.

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