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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 122 · 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.⬛ Why does a line follower wiggle a little as it drives? (a) it keeps fixing its path (b) it is too cold (c) it is dancing (d) its wheels are square
  2. 2.⬛ 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 10. What does it do?     (a) go forward (b) turn left (c) turn right
  3. 3.⬛ Going too fast round a sharp bend, a line follower may … (a) get heavier (b) turn into a car (c) grow wheels (d) lose the line
  4. 4.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) right (b) left (c) nowhere (d) backwards
  5. 5.⬛ 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 left (b) go forward (c) turn right
  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 black. What does it do?     (a) turn right (b) go forward (c) turn left
  7. 7.⬛ 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 left (b) turn right
  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): black–white, white–white, white–white, white–black, white–black. How many times does it 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 52. What does it do?     (a) turn right (b) turn left
  10. 10.⬛ 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 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 white. What does it do?     (a) turn left (b) go forward (c) turn right
  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–black, black–white. How many times does it turn left?
  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 black. What does it do?     (a) go forward (b) turn right (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): white–white, white–white, white–black, black–black, black–white, white–white. 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–white, white–white, black–black, black–black. 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 19. 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 50 and the right sensor reads 75. What does it do?     (a) turn left (b) go forward (c) turn right
  18. 18.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 56. What does it do?     (a) turn right (b) turn left
  19. 19.⬛ 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–white, white–white, black–black, black–black. How many times does it turn right?
  20. 20.⬛ 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) turn left (c) go forward
  21. 21.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 8. What does it do?     (a) turn left (b) turn right
  22. 22.⬛ 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 right (c) turn left
  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–white, black–white, white–black, white–white. How many times does it turn right?
  24. 24.⬛ 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 80. What does it do?     (a) go forward (b) turn left (c) turn right
  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 6 times (left–right): black–white, white–white, black–black, black–black, black–black, black–black. How many times does it 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 40 and the right sensor reads 35. What does it do?     (a) go forward (b) turn right (c) turn left
  27. 27.⬛ 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 20. What does it do?     (a) turn left (b) turn right (c) go forward
  28. 28.⬛ 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 right (b) 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 6 times (left–right): white–black, white–black, white–black, black–black, white–black, black–black. How many times does it turn left?
  30. 30.⬛ 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 right (b) go forward (c) turn left
  31. 31.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 38. What does it do?     (a) turn right (b) 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 5 times (left–right): black–black, black–white, black–white, white–white, black–black. How many times does it turn right?
  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 5 times (left–right): white–black, black–black, white–black, white–black, black–black. How many times does it turn right?
  34. 34.⬛ 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 25. What does it do?     (a) go forward (b) turn left (c) turn right
  35. 35.⬛ 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–black, black–black, white–white. How many times does it 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 4 times (left–right): white–white, black–white, black–black, white–black. How many times does it 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 30 and the right sensor reads 60. What does it do?     (a) turn right (b) turn left (c) go forward
  38. 38.⬛ 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 85. What does it do?     (a) turn right (b) turn left (c) go forward
  39. 39.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 16. What does it do?     (a) turn right (b) turn left
  40. 40.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 59. What does it do?     (a) turn right (b) turn left

Answer key

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

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