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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 13 · 40 questions
TalentJR

Robot tip (Turn towards the line): Left sees black → turn left; right sees black → turn right; both white → go forward. In an if / else if chain the first true rule wins (both black → the rule written first). With numbers: a reading below the threshold (for example below 40) means black.

NameDateTime takenScore ___ / 40
  1. 1.⬛ A line follower runs:
    if (right sees black) { turn right } else if (left sees black) { turn left } else { go forward }
    The left sensor sees white and the right sensor sees black. What does it do?     (a) go forward (b) turn right (c) turn left
  2. 2.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 35 and the right sensor reads 20. What does it do?     (a) turn right (b) go forward (c) turn left
  3. 3.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    The left sensor sees black and the right sensor sees white. What does it do?     (a) turn left (b) turn right (c) go forward
  4. 4.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    The left sensor sees black and the right sensor sees black. What does it do?     (a) turn right (b) turn left (c) go forward
  5. 5.⬛ Going too fast round a sharp bend, a line follower may … (a) lose the line (b) get heavier (c) grow wheels (d) turn into a car
  6. 6.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 10 and the right sensor reads 70. What does it do?     (a) turn left (b) go forward (c) turn right
  7. 7.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    The left sensor sees white and the right sensor sees white. What does it do?     (a) turn right (b) go forward (c) turn left
  8. 8.⬛ A line follower runs:
    if (right sees black) { turn right } else if (left sees black) { turn left } else { go forward }
    The left sensor sees black and the right sensor sees black. What does it do?     (a) turn left (b) turn right (c) go forward
  9. 9.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 10 and the right sensor reads 45. What does it do?     (a) turn right (b) turn left (c) go forward
  10. 10.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 70 and the right sensor reads 70. What does it do?     (a) go forward (b) turn left (c) turn right
  11. 11.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 50. What does it do?     (a) turn right (b) turn left
  12. 12.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 5 times (left–right): black–black, black–black, white–black, white–white, white–black. How many times does it turn left?
  13. 13.⬛ A line follower runs:
    if (right sees black) { turn right } else if (left sees black) { turn left } else { go forward }
    The left sensor sees black and the right sensor sees white. What does it do?     (a) turn right (b) turn left (c) go forward
  14. 14.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 21. What does it do?     (a) turn left (b) turn right
  15. 15.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 6 times (left–right): white–white, white–white, white–black, white–white, black–black, white–white. How many times does it turn left?
  16. 16.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 5 times (left–right): white–white, black–white, white–white, black–white, black–white. How many times does it turn left?
  17. 17.⬛ A line follower runs:
    if (right sees black) { turn right } else if (left sees black) { turn left } else { go forward }
    The left sensor sees white and the right sensor sees white. What does it do?     (a) turn left (b) go forward (c) turn right
  18. 18.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 55 and the right sensor reads 30. What does it do?     (a) turn left (b) turn right (c) go forward
  19. 19.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 16. What does it do?     (a) turn left (b) turn right
  20. 20.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) backwards (b) right (c) left (d) nowhere
  21. 21.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 10 and the right sensor reads 10. What does it do?     (a) turn right (b) go forward (c) turn left
  22. 22.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 15 and the right sensor reads 70. What does it do?     (a) turn right (b) turn left (c) go forward
  23. 23.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 34. What does it do?     (a) turn right (b) turn left
  24. 24.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 9. What does it do?     (a) turn right (b) turn left
  25. 25.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 62. What does it do?     (a) turn left (b) turn right
  26. 26.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 4 times (left–right): black–white, white–white, black–black, black–black. How many times does it turn left?
  27. 27.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 20 and the right sensor reads 15. What does it do?     (a) turn right (b) go forward (c) turn left
  28. 28.⬛ Why does a line follower wiggle a little as it drives? (a) it keeps fixing its path (b) it is dancing (c) it is too cold (d) its wheels are square
  29. 29.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 5 times (left–right): white–white, white–black, white–black, black–white, black–white. How many times does it turn left?
  30. 30.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 58. What does it do?     (a) turn left (b) turn right
  31. 31.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 65 and the right sensor reads 25. What does it do?     (a) go forward (b) turn right (c) turn left
  32. 32.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 4 times (left–right): black–white, white–white, white–black, white–white. How many times does it turn left?
  33. 33.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 75 and the right sensor reads 70. What does it do?     (a) turn left (b) go forward (c) turn right
  34. 34.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    The left sensor sees white and the right sensor sees black. What does it do?     (a) go forward (b) turn right (c) turn left
  35. 35.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 60 and the right sensor reads 30. What does it do?     (a) turn right (b) turn left (c) go forward
  36. 36.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 55. What does it do?     (a) turn left (b) turn right
  37. 37.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 85 and the right sensor reads 80. What does it do?     (a) turn right (b) turn left (c) go forward
  38. 38.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 5 times (left–right): white–white, white–black, black–white, black–black, black–black. How many times does it turn right?
  39. 39.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 70 and the right sensor reads 10. What does it do?     (a) go forward (b) turn left (c) turn right
  40. 40.⬛ A line follower runs:
    if (left sees black) { turn left } else if (right sees black) { turn right } else { go forward }
    It checks its sensors 6 times (left–right): white–black, white–black, black–black, white–white, white–black, white–white. How many times does it turn left?

Answer key

  1. turn right
  2. turn left
  3. turn left
  4. turn left
  5. lose the line
  6. turn left
  7. go forward
  8. turn right
  9. turn left
  10. go forward
  11. turn left
  12. 2
  13. turn left
  14. turn right
  15. 1
  16. 3
  17. go forward
  18. turn right
  19. turn right
  20. left
  21. turn left
  22. turn left
  23. turn left
  24. turn right
  25. turn left
  26. 3
  27. turn left
  28. it keeps fixing its path
  29. 2
  30. turn left
  31. turn right
  32. 1
  33. go forward
  34. turn right
  35. turn right
  36. turn left
  37. go forward
  38. 1
  39. turn right
  40. 1

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