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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 273 · 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 }
    The left sensor sees white and the right sensor sees white. What does it do?     (a) go forward (b) turn right (c) turn left
  2. 2.⬛ 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) go forward (c) turn left
  3. 3.⬛ 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 25. What does it do?     (a) turn left (b) turn right (c) go forward
  4. 4.⬛ Going too fast round a sharp bend, a line follower may … (a) grow wheels (b) get heavier (c) lose the line (d) turn into a car
  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, white–black, white–black, white–white. How many times does it turn left?
  6. 6.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) nowhere (b) right (c) left (d) backwards
  7. 7.⬛ 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 50. What does it do?     (a) go forward (b) turn left (c) turn right
  8. 8.⬛ 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
  9. 9.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 63. 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 43. What does it do?     (a) turn right (b) turn left
  11. 11.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 48. 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 4 times (left–right): white–white, black–white, white–white, white–white. How many times does it turn right?
  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 80. What does it do?     (a) go forward (b) turn left (c) turn right
  14. 14.⬛ Why does a line follower wiggle a little as it drives? (a) its wheels are square (b) it is too cold (c) it keeps fixing its path (d) it is dancing
  15. 15.⬛ 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 85. What does it do?     (a) turn left (b) turn right (c) go forward
  16. 16.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 66. What does it do?     (a) turn left (b) 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 30 and the right sensor reads 60. What does it do?     (a) go forward (b) turn left (c) turn right
  18. 18.⬛ 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
  19. 19.⬛ 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
  20. 20.⬛ 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 50. 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 50 and the right sensor reads 50. What does it do?     (a) turn left (b) turn right (c) go forward
  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 90. What does it do?     (a) turn left (b) turn right (c) go forward
  23. 23.⬛ 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–black, black–white, white–black, white–white, black–black, black–black. How many times does it turn right?
  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 6 times (left–right): black–black, white–white, black–black, white–black, white–white, white–white. How many times does it 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 51. 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 6 times (left–right): white–white, black–white, black–white, black–white, white–black, black–white. How many times does it turn left?
  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): black–white, black–black, white–white, white–black, white–black. How many times does it turn right?
  28. 28.⬛ 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 right (b) turn left
  29. 29.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 64. What does it do?     (a) turn right (b) 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–white, white–white, white–white. How many times does it turn left?
  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): black–white, white–black, white–white, black–white, white–white. How many times does it 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–black, white–white, black–white, black–white. How many times does it turn right?
  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 30. What does it do?     (a) turn right (b) turn left (c) go forward
  34. 34.⬛ 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
  35. 35.⬛ 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 70. What does it do?     (a) go forward (b) turn left (c) turn right
  36. 36.⬛ 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, black–black, black–white, white–white, white–white, white–white. How many times does it turn left?
  37. 37.⬛ 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 40. What does it do?     (a) go forward (b) turn right (c) turn left
  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): white–black, black–white, black–white, white–white. 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 65 and the right sensor reads 65. What does it do?     (a) turn left (b) turn right (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 60 and the right sensor reads 75. What does it do?     (a) turn right (b) go forward (c) turn left

Answer key

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

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