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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 132 · 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 (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, black–white. How many times does it turn right?
  2. 2.⬛ 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, black–white, black–black, white–black, black–white, white–black. How many times does it turn right?
  3. 3.⬛ 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–white, white–white, white–white, black–white, white–black. How many times does it turn right?
  4. 4.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 22. What does it do?     (a) turn left (b) turn right
  5. 5.⬛ 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–black, black–white, black–white, black–white. How many times does it turn left?
  6. 6.⬛ 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) go forward (b) turn right (c) turn left
  7. 7.⬛ 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 60. What does it do?     (a) turn left (b) go forward (c) turn right
  8. 8.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 56. What does it do?     (a) turn right (b) turn left
  9. 9.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 40. What does it do?     (a) turn right (b) turn left
  10. 10.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 27. What does it do?     (a) turn left (b) turn right
  11. 11.⬛ 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) turn left (b) turn right (c) go forward
  12. 12.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 27. What does it do?     (a) turn right (b) turn left
  13. 13.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 25 and the right sensor reads 30. What does it do?     (a) turn left (b) turn right (c) go forward
  14. 14.⬛ 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 left (b) go forward (c) turn right
  15. 15.⬛ 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) go forward (b) turn left (c) turn right
  16. 16.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 48. What does it do?     (a) turn right (b) turn left
  17. 17.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 6. What does it do?     (a) turn right (b) turn left
  18. 18.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 40 and the right sensor reads 70. What does it do?     (a) go forward (b) turn left (c) turn right
  19. 19.⬛ Why does a line follower wiggle a little as it drives? (a) it keeps fixing its path (b) it is too cold (c) its wheels are square (d) it is dancing
  20. 20.⬛ 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–black, white–white, white–black, white–white. How many times does it turn right?
  21. 21.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 10. What does it do?     (a) turn right (b) turn left
  22. 22.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 31. What does it do?     (a) turn left (b) turn right
  23. 23.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 20. What does it do?     (a) turn right (b) turn left
  24. 24.⬛ 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–black, black–white, white–white, white–black. How many times does it turn right?
  25. 25.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 46. What does it do?     (a) turn right (b) turn left
  26. 26.⬛ 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 left (b) turn right (c) go forward
  27. 27.⬛ 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–white, white–black, white–white, black–white. How many times does it turn left?
  28. 28.⬛ 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): black–white, black–white, white–black, black–white, black–white, white–black. How many times does it turn right?
  29. 29.⬛ 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) turn left (b) turn right (c) go forward
  30. 30.⬛ 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) go forward (b) turn left (c) turn right
  31. 31.⬛ 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–white, white–white, white–white, white–black. How many times does it turn right?
  32. 32.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 39. What does it do?     (a) turn right (b) turn left
  33. 33.⬛ 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): white–white, white–white, white–white, white–white. How many times does it turn left?
  34. 34.⬛ 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–black, white–white, black–white, white–white, black–white. How many times does it 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 25 and the right sensor reads 75. What does it do?     (a) go forward (b) turn right (c) turn left
  36. 36.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 16. What does it do?     (a) turn left (b) turn right
  37. 37.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 40. What does it do?     (a) turn left (b) turn right
  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 4 times (left–right): black–white, black–black, white–black, black–black. How many times does it turn left?
  39. 39.⬛ 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 right (b) go forward (c) turn left
  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, white–white, white–black, black–white, black–white. How many times does it turn right?

Answer key

  1. 1
  2. 2
  3. 1
  4. turn right
  5. 4
  6. turn right
  7. go forward
  8. turn left
  9. turn right
  10. turn right
  11. turn right
  12. turn right
  13. turn left
  14. go forward
  15. turn left
  16. turn left
  17. turn right
  18. go forward
  19. it keeps fixing its path
  20. 1
  21. turn right
  22. turn right
  23. turn right
  24. 1
  25. turn right
  26. turn left
  27. 1
  28. 2
  29. turn right
  30. go forward
  31. 1
  32. turn right
  33. 0
  34. 2
  35. turn left
  36. turn right
  37. turn left
  38. 3
  39. turn left
  40. 3

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