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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 212 · 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 35 and the right sensor reads 10. What does it do?     (a) go forward (b) turn right (c) turn left
  2. 2.⬛ 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 left (b) 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 55 and the right sensor reads 20. What does it do?     (a) turn left (b) turn right (c) go forward
  4. 4.⬛ Why does a line follower wiggle a little as it drives? (a) it is dancing (b) it is too cold (c) its wheels are square (d) it keeps fixing its path
  5. 5.⬛ 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
  6. 6.⬛ 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 45. What does it do?     (a) turn left (b) go forward (c) 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 4 times (left–right): black–white, white–white, black–black, white–black. How many times does it turn left?
  8. 8.⬛ 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 75. What does it do?     (a) turn left (b) turn right (c) go forward
  9. 9.⬛ 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 left (b) turn right (c) go forward
  10. 10.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 34. What does it do?     (a) turn right (b) turn left
  11. 11.⬛ 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 80. What does it do?     (a) turn left (b) go forward (c) turn right
  12. 12.⬛ Going too fast round a sharp bend, a line follower may … (a) get heavier (b) grow wheels (c) turn into a car (d) lose the line
  13. 13.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 0. What does it do?     (a) turn left (b) turn right
  14. 14.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) right (b) backwards (c) nowhere (d) 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 6 times (left–right): black–white, white–black, white–black, white–white, black–black, white–white. How many times does it 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 15 and the right sensor reads 15. What does it do?     (a) turn right (b) turn left (c) go forward
  17. 17.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 60. What does it do?     (a) turn left (b) 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 65 and the right sensor reads 55. What does it do?     (a) turn left (b) turn right (c) go forward
  19. 19.⬛ 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 25. What does it do?     (a) turn left (b) turn right (c) go forward
  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 10. What does it do?     (a) turn left (b) turn right (c) go forward
  21. 21.⬛ 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 20. What does it do?     (a) turn right (b) go forward (c) turn left
  22. 22.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 41. What does it do?     (a) turn right (b) turn left
  23. 23.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 50. What does it do?     (a) turn right (b) turn left
  24. 24.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 32. What does it do?     (a) turn left (b) turn right
  25. 25.⬛ 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 left (c) 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 5 times (left–right): white–white, black–white, black–black, black–white, white–white. How many times does it turn right?
  27. 27.⬛ 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 15. What does it do?     (a) turn right (b) go forward (c) turn left
  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 black. What does it do?     (a) turn right (b) go forward (c) turn left
  29. 29.⬛ 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 right (b) 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 63. What does it do?     (a) turn left (b) turn right
  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 6 times (left–right): white–black, black–black, black–white, white–white, black–white, white–white. How many times does it turn left?
  32. 32.⬛ 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 15. What does it do?     (a) turn left (b) go forward (c) turn right
  33. 33.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 62. What does it do?     (a) turn right (b) turn left
  34. 34.⬛ 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, black–white, black–white. How many times does it 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 80 and the right sensor reads 40. What does it do?     (a) turn left (b) turn right (c) go forward
  36. 36.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 55. What does it do?     (a) turn left (b) turn right
  37. 37.⬛ 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
  38. 38.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 61. What does it do?     (a) turn right (b) turn left
  39. 39.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 15. What does it do?     (a) turn left (b) 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 85. What does it do?     (a) go forward (b) turn right (c) turn left

Answer key

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

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