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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 258 · 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 one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 65. What does it do?     (a) turn right (b) turn left
  2. 2.⬛ Why does a line follower wiggle a little as it drives? (a) it is too cold (b) its wheels are square (c) it is dancing (d) it keeps fixing its path
  3. 3.⬛ Going too fast round a sharp bend, a line follower may … (a) lose the line (b) grow wheels (c) get heavier (d) turn into a car
  4. 4.⬛ 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, black–white, white–white. How many times does it turn right?
  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 white and the right sensor sees black. What does it do?     (a) turn right (b) go forward (c) turn left
  6. 6.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 12. What does it do?     (a) turn left (b) turn right
  7. 7.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 74. What does it do?     (a) turn right (b) 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 45 and the right sensor reads 50. What does it do?     (a) turn right (b) go forward (c) turn left
  9. 9.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) backwards (b) nowhere (c) left (d) 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 white and the right sensor sees black. What does it do?     (a) go forward (b) turn right (c) 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 60 and the right sensor reads 70. What does it do?     (a) turn right (b) turn left (c) go forward
  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 5 times (left–right): black–white, black–black, white–black, white–white, black–black. How many times does it turn right?
  13. 13.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 10. What does it do?     (a) turn right (b) turn left
  14. 14.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 23. What does it do?     (a) turn left (b) 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 55 and the right sensor reads 15. What does it do?     (a) go forward (b) turn right (c) 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 25. What does it do?     (a) turn right (b) turn left (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–white, black–black, white–black, white–black. 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 65 and the right sensor reads 20. What does it do?     (a) turn right (b) go forward (c) turn left
  19. 19.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 19. What does it do?     (a) turn right (b) turn left
  20. 20.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 57. What does it do?     (a) turn right (b) turn left
  21. 21.⬛ 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 20. 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 < 30) { turn right } else { turn left }
    The sensor reads 51. 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 4. What does it do?     (a) turn left (b) turn right
  24. 24.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 69. What does it do?     (a) turn right (b) turn left
  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): white–black, white–black, white–black, white–black, white–black, black–white. How many times does it 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 4 times (left–right): white–black, white–white, black–black, white–white. How many times does it turn right?
  27. 27.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 37. What does it do?     (a) turn right (b) turn left
  28. 28.⬛ 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) go forward (b) turn left (c) turn right
  29. 29.⬛ 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 left (c) turn right
  30. 30.⬛ 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) 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 62. What does it do?     (a) turn left (b) turn right
  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): white–black, white–white, black–white, white–black. How many times does it turn right?
  33. 33.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 60. What does it do?     (a) turn left (b) turn right
  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 6 times (left–right): white–black, white–white, white–white, white–white, black–black, 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 70 and the right sensor reads 50. What does it do?     (a) turn right (b) turn left (c) go forward
  36. 36.⬛ 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 left (c) 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 15 and the right sensor reads 60. What does it do?     (a) go forward (b) turn left (c) turn right
  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 6 times (left–right): black–white, black–black, black–black, white–black, black–white, white–black. How many times does it turn left?
  39. 39.⬛ 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 25. What does it do?     (a) go forward (b) turn left (c) turn right
  40. 40.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 56. What does it do?     (a) turn left (b) turn right

Answer key

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

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