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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 47 · 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 55 and the right sensor reads 55. What does it do?     (a) go forward (b) turn right (c) turn left
  2. 2.⬛ 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–black, black–black, white–white, black–black, white–white. How many times does it 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 85. What does it do?     (a) turn left (b) go forward (c) turn right
  4. 4.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 27. What does it do?     (a) turn right (b) turn left
  5. 5.⬛ 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 80. What does it do?     (a) turn right (b) turn left (c) go forward
  6. 6.⬛ 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, black–black, white–white, black–white, white–black, white–white. How many times does it turn right?
  7. 7.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 45. What does it do?     (a) turn right (b) turn left
  8. 8.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 25. What does it do?     (a) turn right (b) 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 6 times (left–right): black–white, white–white, white–black, white–white, white–white, white–black. How many times does it turn right?
  10. 10.⬛ 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
  11. 11.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 7. What does it do?     (a) turn left (b) 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 black and the right sensor sees black. What does it do?     (a) go forward (b) turn left (c) turn right
  13. 13.⬛ 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
  14. 14.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 43. What does it do?     (a) turn left (b) turn right
  15. 15.⬛ 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
  16. 16.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 28. What does it do?     (a) turn right (b) turn left
  17. 17.⬛ 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) go forward (c) turn left
  18. 18.⬛ 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 right (b) turn left
  19. 19.⬛ Going too fast round a sharp bend, a line follower may … (a) grow wheels (b) get heavier (c) lose the line (d) turn into a car
  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): white–white, white–black, white–black, white–black, black–white, white–white. How many times does it 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 40. What does it do?     (a) turn left (b) turn right (c) go forward
  22. 22.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 23. 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 10 and the right sensor reads 15. What does it do?     (a) turn left (b) go forward (c) turn right
  24. 24.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 54. What does it do?     (a) turn right (b) turn left
  25. 25.⬛ 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 right (b) go forward (c) 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 20 and the right sensor reads 30. What does it do?     (a) turn left (b) turn right (c) go forward
  27. 27.⬛ 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 left (b) turn right (c) go forward
  28. 28.⬛ 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–black, white–black, black–black, white–white. How many times does it turn right?
  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–black, black–white, white–black, white–white, black–white. How many times does it 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 white and the right sensor sees white. What does it do?     (a) turn right (b) turn left (c) go forward
  31. 31.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 13. 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 }
    The left sensor sees white and the right sensor sees white. 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 < 30) { turn right } else { turn left }
    The sensor reads 9. What does it do?     (a) turn right (b) turn left
  34. 34.⬛ 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
  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 6 times (left–right): white–white, white–white, white–black, white–white, white–black, white–black. How many times does it turn left?
  36. 36.⬛ 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 90. What does it do?     (a) turn right (b) turn left (c) go forward
  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): white–white, white–white, white–white, white–white, black–black, black–black. How many times does it 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, white–black, black–black, white–white, black–black, black–black. How many times does it turn right?
  39. 39.⬛ 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–black, black–white, black–black. How many times does it 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 35 and the right sensor reads 35. What does it do?     (a) go forward (b) turn left (c) turn right

Answer key

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

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