Be on the lookout
Working with a light sensor watcher, students may continue to use the timed stack components used in the ZZforever program. In other words, students ignore the function input serves in a decision branch. They use a sensor watcher, but they do not allow input to dictate behavior.
The program ZigZagDark illustrates this point.
Here is an example of what some do:
What you can do: Show students the programs StopAt2 and StopLight, Transparency #7.
Ask students which program they’d use if they wanted their robot to move forward while it’s dark. Have them explain how the programs are different from each other.
Note: Depending on your robot, you may need to change the timing on the single motor blocks in the sample program.