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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 95 · 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 < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 85 and the right sensor reads 75. What does it do?     (a) turn left (b) turn right (c) go forward
  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 white and the right sensor sees white. What does it do?     (a) turn left (b) go forward (c) turn right
  3. 3.⬛ 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 65. What does it do?     (a) turn right (b) go forward (c) turn left
  4. 4.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 65. What does it do?     (a) turn right (b) turn left
  5. 5.⬛ Why does a line follower wiggle a little as it drives? (a) it keeps fixing its path (b) its wheels are square (c) it is dancing (d) it is too cold
  6. 6.⬛ 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
  7. 7.⬛ 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 left (b) turn right (c) go forward
  8. 8.⬛ 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, white–white, white–white. How many times does it turn left?
  9. 9.⬛ 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, black–black, white–white. How many times does it turn left?
  10. 10.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) nowhere (b) left (c) right (d) backwards
  11. 11.⬛ 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, black–white, black–white, black–white, white–black. How many times does it turn right?
  12. 12.⬛ 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
  13. 13.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 58. What does it do?     (a) turn right (b) 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 4 times (left–right): black–black, black–white, white–black, white–white. How many times does it turn left?
  15. 15.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 18. What does it do?     (a) turn right (b) 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 90 and the right sensor reads 55. What does it do?     (a) turn left (b) turn right (c) go forward
  17. 17.⬛ 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, white–black, white–white. How many times does it 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 30 and the right sensor reads 25. What does it do?     (a) turn right (b) go forward (c) turn left
  19. 19.⬛ 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) turn left (c) go forward
  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 6 times (left–right): black–white, black–black, white–white, black–black, white–white, black–white. How many times does it turn left?
  21. 21.⬛ Going too fast round a sharp bend, a line follower may … (a) grow wheels (b) turn into a car (c) lose the line (d) get heavier
  22. 22.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 27. What does it do?     (a) turn left (b) turn right
  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 4 times (left–right): black–black, white–black, white–black, black–black. How many times does it 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 30. What does it do?     (a) turn left (b) 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 48. 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 10 and the right sensor reads 45. What does it do?     (a) turn right (b) turn left (c) go forward
  27. 27.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 19. What does it do?     (a) turn right (b) turn left
  28. 28.⬛ 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 85. What does it do?     (a) go forward (b) turn right (c) turn left
  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 4 times (left–right): white–white, black–black, white–white, black–white. How many times does it turn right?
  30. 30.⬛ 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 60. What does it do?     (a) turn left (b) turn right (c) go forward
  31. 31.⬛ 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 85. What does it do?     (a) go forward (b) turn left (c) turn right
  32. 32.⬛ 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
  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) turn right (b) turn left (c) go forward
  34. 34.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 38. What does it do?     (a) turn right (b) turn left
  35. 35.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 37. What does it do?     (a) turn left (b) turn right
  36. 36.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 66. 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 20 and the right sensor reads 75. What does it do?     (a) go forward (b) turn left (c) turn right
  38. 38.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 70. 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 55 and the right sensor reads 10. 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 40 and the right sensor reads 60. What does it do?     (a) turn right (b) go forward (c) turn left

Answer key

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

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