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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 327 · 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.⬛ Going too fast round a sharp bend, a line follower may … (a) lose the line (b) get heavier (c) turn into a car (d) grow wheels
  2. 2.⬛ 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 75. What does it do?     (a) turn left (b) go forward (c) turn right
  3. 3.⬛ Why does a line follower wiggle a little as it drives? (a) it is dancing (b) it keeps fixing its path (c) it is too cold (d) its wheels are square
  4. 4.⬛ 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 85. What does it do?     (a) turn left (b) go forward (c) turn right
  5. 5.⬛ 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 left (b) go forward (c) turn right
  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 white and the right sensor sees black. What does it do?     (a) turn left (b) go forward (c) turn right
  7. 7.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) backwards (b) nowhere (c) right (d) left
  8. 8.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 45 and the right sensor reads 20. What does it do?     (a) turn right (b) go forward (c) turn left
  9. 9.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 60. What does it do?     (a) turn right (b) turn left
  10. 10.⬛ 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 right (b) go forward (c) turn left
  11. 11.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 30 and the right sensor reads 45. What does it do?     (a) go forward (b) turn left (c) turn right
  12. 12.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 37. What does it do?     (a) turn left (b) turn right
  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 white and the right sensor sees white. What does it do?     (a) turn right (b) go forward (c) turn left
  14. 14.⬛ 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–black, white–black, black–white, black–white, white–black. How many times does it turn left?
  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 4 times (left–right): white–black, white–white, black–black, white–white. How many times does it turn left?
  16. 16.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 67. What does it do?     (a) turn right (b) turn left
  17. 17.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 50 and the right sensor reads 25. 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 15 and the right sensor reads 35. What does it do?     (a) turn left (b) go forward (c) turn right
  19. 19.⬛ 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 45. What does it do?     (a) go forward (b) turn left (c) turn right
  20. 20.⬛ 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 10. What does it do?     (a) go forward (b) turn left (c) turn right
  21. 21.⬛ 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 45. 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 45 and the right sensor reads 55. What does it do?     (a) turn left (b) turn right (c) go forward
  23. 23.⬛ 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 20. What does it do?     (a) turn right (b) go forward (c) turn left
  24. 24.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 18. What does it do?     (a) turn right (b) turn left
  25. 25.⬛ 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–black, white–white, white–white. How many times does it 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–black, white–white, black–white. How many times does it turn right?
  27. 27.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 24. What does it do?     (a) turn right (b) turn left
  28. 28.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 13. What does it do?     (a) turn right (b) turn left
  29. 29.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 15. What does it do?     (a) turn right (b) 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 17. What does it do?     (a) turn right (b) turn left
  31. 31.⬛ 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 right (b) go forward (c) turn left
  32. 32.⬛ 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 10. What does it do?     (a) turn left (b) turn right (c) go forward
  33. 33.⬛ 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 right (c) turn left
  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 white. What does it do?     (a) turn left (b) go forward (c) turn right
  35. 35.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 43. What does it do?     (a) turn left (b) turn right
  36. 36.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 35. What does it do?     (a) turn right (b) turn left
  37. 37.⬛ 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–black, black–black, white–white. How many times does it turn left?
  38. 38.⬛ 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 15. What does it do?     (a) go forward (b) turn right (c) turn left
  39. 39.⬛ 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 25. What does it do?     (a) turn left (b) go forward (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 }
    The left sensor sees black and the right sensor sees white. What does it do?     (a) go forward (b) turn left (c) turn right

Answer key

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

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