Project A: the robot course

The project: build a course on the floor or in a grid with a start, a goal and at least one obstacle. Write a program that takes the robot (a friend, a Blue-Bot or a sprite in Scratch) all the way there.

Steps:

1. Draw the course on squared paper.
2. Write the commands — use repeat wherever the same thing happens several times.
3. Run exactly what is written. Did it go wrong? Find which command it was and change only that one.
4. Show the course and the program to someone else. Can they run it without your help?

Example course (R = robot facing right, X = obstacle, G = goal):

R · X · ·
· · · · ·
· · · · G

One program: forward, right, forward, forward, left, forward, forward, forward. Can you shorten it with a loop? (forward, right, repeat 2: forward, left, repeat 3: forward.)

Make your own course harder: two obstacles, or a goal that requires the robot to turn all the way around.