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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 343 · 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) get heavier (b) lose the line (c) grow wheels (d) turn into a car
  2. 2.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) left (b) backwards (c) right (d) nowhere
  3. 3.⬛ 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 15. What does it do?     (a) go forward (b) turn left (c) turn right
  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 white and the right sensor sees black. What does it do?     (a) go forward (b) turn left (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 }
    It checks its sensors 5 times (left–right): white–white, black–black, black–black, white–black, white–white. How many times does it turn left?
  6. 6.⬛ 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, black–black, white–black, white–black, white–white. How many times does it turn right?
  7. 7.⬛ 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, black–white, black–black, black–white, black–black. How many times does it turn right?
  8. 8.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 63. What does it do?     (a) turn right (b) turn left
  9. 9.⬛ 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 10. What does it do?     (a) turn left (b) go forward (c) turn right
  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) turn right (b) go forward (c) turn left
  11. 11.⬛ Why does a line follower wiggle a little as it drives? (a) it is too cold (b) it is dancing (c) it keeps fixing its path (d) its wheels are square
  12. 12.⬛ 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 35. What does it do?     (a) go forward (b) turn right (c) turn left
  13. 13.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 68. What does it do?     (a) turn left (b) turn right
  14. 14.⬛ 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
  15. 15.⬛ 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 right (c) turn left
  16. 16.⬛ 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 40. What does it do?     (a) go forward (b) turn left (c) turn right
  17. 17.⬛ 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 35. What does it do?     (a) go forward (b) turn right (c) 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 50 and the right sensor reads 65. What does it do?     (a) go forward (b) turn left (c) turn right
  19. 19.⬛ 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 left (b) 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 15 and the right sensor reads 80. What does it do?     (a) turn right (b) turn left (c) go forward
  21. 21.⬛ 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, white–white, white–white, white–white. How many times does it 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 30 and the right sensor reads 40. What does it do?     (a) turn right (b) turn left (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 85 and the right sensor reads 55. What does it do?     (a) turn right (b) go forward (c) 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 5 times (left–right): white–white, black–black, white–black, white–black, white–white. How many times does it turn left?
  25. 25.⬛ 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
  26. 26.⬛ 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 60. 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 6 times (left–right): black–white, black–white, white–black, black–white, black–white, white–white. How many times does it turn right?
  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 4 times (left–right): black–white, white–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 white. What does it do?     (a) turn right (b) go forward (c) turn left
  30. 30.⬛ 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, black–black, white–white, white–white. How many times does it turn right?
  31. 31.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 47. What does it do?     (a) turn left (b) 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 26. What does it do?     (a) turn left (b) turn right
  33. 33.⬛ 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
  34. 34.⬛ 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 65. What does it do?     (a) turn right (b) turn left (c) go forward
  35. 35.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 61. What does it do?     (a) turn right (b) turn left
  36. 36.⬛ 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 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 80 and the right sensor reads 80. What does it do?     (a) turn right (b) turn left (c) go forward
  38. 38.⬛ 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 left (b) 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 25 and the right sensor reads 40. What does it do?     (a) turn right (b) turn left (c) go forward
  40. 40.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 80 and the right sensor reads 25. What does it do?     (a) turn left (b) turn right (c) go forward

Answer key

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

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