Obstacle Avoidance Vocabulary

Word Bank

Fill In the Blanks

1. A measures something about the world and reports it as a number.
2. The distance sensor’s reading comes from , and it returns 2000 mm when nothing is in front of it.
3. The unit the distance sensor uses is the .
4. An runs its code only when the condition is true.
5. The part runs when the if condition is false.
6. The true-or-false test an if checks, like eyes.distance() < 200, is the .
7. A keeps repeating; while True: repeats forever.
8. When the robot does something unexpected, that’s — it did exactly what the code said.

Quick Checks

• Circle the unit used by distance():
  degrees / millimeters / seconds

• The sensor has nothing in front of it. What number does distance() give?
  Circle one: 0 / 200 / 2000

• The robot stops too far from the wall. Should you make the trigger number bigger or smaller?
  Circle one: bigger / smaller

• A while True: loop runs forever. How do you stop it?
  

Stretch: Read the Code

What will this robot do? Write it in plain words.

while True:
    if eyes.distance() < 200:
        robot.straight(-100)
        robot.turn(90)
    else:
        robot.drive(150, 0)
    wait(10)

It will: