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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 245 · 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) turn into a car (b) grow wheels (c) lose the line (d) get heavier
  2. 2.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) backwards (b) left (c) nowhere (d) right
  3. 3.⬛ 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 left (b) turn right
  4. 4.⬛ 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 40. What does it do?     (a) go forward (b) turn left (c) turn right
  5. 5.⬛ Why does a line follower wiggle a little as it drives? (a) it is too cold (b) its wheels are square (c) it keeps fixing its path (d) it is dancing
  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 one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 25. What does it do?     (a) turn left (b) turn right
  8. 8.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 55. What does it do?     (a) turn right (b) turn left
  9. 9.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 39. What does it do?     (a) turn left (b) turn right
  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 black 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 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
  12. 12.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 49. What does it do?     (a) turn right (b) 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 33. What does it do?     (a) turn left (b) turn right
  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, white–white, white–white, white–white, white–white, black–black. How many times does it turn right?
  15. 15.⬛ 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 55. What does it do?     (a) turn right (b) turn left (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 27. What does it do?     (a) turn right (b) turn left
  17. 17.⬛ 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 right (b) turn left
  18. 18.⬛ 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, black–white, white–black, white–black. How many times does it 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 60. 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 20 and the right sensor reads 80. 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 85 and the right sensor reads 50. What does it do?     (a) turn right (b) turn left (c) go forward
  22. 22.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 14. What does it do?     (a) turn left (b) turn right
  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 80. What does it do?     (a) turn right (b) turn left (c) go forward
  24. 24.⬛ 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) turn right (c) go forward
  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): black–white, white–white, white–black, black–white, white–black. How many times does it turn right?
  26. 26.⬛ 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 left (b) turn right (c) go forward
  27. 27.⬛ 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 60. What does it do?     (a) turn left (b) turn right (c) go forward
  28. 28.⬛ 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
  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 5 times (left–right): black–white, white–black, white–black, black–black, white–black. How many times does it turn left?
  30. 30.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 44. What does it do?     (a) turn right (b) 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 4 times (left–right): black–black, white–white, black–black, white–black. How many times does it turn right?
  32. 32.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 42. What does it do?     (a) turn right (b) turn left
  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 6 times (left–right): black–white, black–black, white–white, white–white, white–white, black–black. How many times does it 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 75 and the right sensor reads 70. 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 5 times (left–right): black–black, white–white, black–white, black–white, white–white. How many times does it 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 44. 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 6 times (left–right): black–white, black–white, black–white, white–white, black–white, white–black. How many times does it turn right?
  38. 38.⬛ 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 left (b) go forward (c) turn right
  39. 39.⬛ 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
  40. 40.⬛ 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 40. What does it do?     (a) turn left (b) go forward (c) turn right

Answer key

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

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