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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 46 · 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 60 and the right sensor reads 75. What does it do?     (a) turn left (b) go forward (c) turn right
  2. 2.⬛ 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 right (c) turn left
  3. 3.⬛ 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 30. What does it do?     (a) go forward (b) turn left (c) turn right
  4. 4.⬛ Going too fast round a sharp bend, a line follower may … (a) turn into a car (b) get heavier (c) lose the line (d) grow wheels
  5. 5.⬛ 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, black–white, black–black, black–white. How many times does it turn right?
  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): white–black, white–black, black–white, white–black, black–white, black–white. How many times does it turn left?
  7. 7.⬛ 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
  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, black–black, white–black, white–black, white–white. How many times does it 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 0. 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 }
    It checks its sensors 6 times (left–right): black–white, black–white, white–black, white–black, white–white, white–white. How many times does it 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 white. What does it do?     (a) go forward (b) turn right (c) turn left
  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.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) nowhere (b) right (c) backwards (d) left
  14. 14.⬛ 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 40. What does it do?     (a) turn left (b) go forward (c) 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 58. What does it do?     (a) turn right (b) turn left
  16. 16.⬛ 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, white–white, black–white, white–black. How many times does it turn left?
  17. 17.⬛ 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) go forward (c) turn right
  18. 18.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 34. What does it do?     (a) turn right (b) turn left
  19. 19.⬛ 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 45. What does it do?     (a) turn right (b) turn left (c) go forward
  20. 20.⬛ 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 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 45 and the right sensor reads 15. What does it do?     (a) go forward (b) turn left (c) turn right
  22. 22.⬛ 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–white, white–white, black–black, black–black. How many times does it 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 5 times (left–right): black–white, white–white, black–white, black–white, black–white. How many times does it turn right?
  24. 24.⬛ 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–white, black–black. How many times does it 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 4 times (left–right): white–black, black–black, black–black, white–white. How many times does it turn left?
  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): black–black, black–white, black–white, white–white. How many times does it turn left?
  27. 27.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 48. What does it do?     (a) turn right (b) 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 white. What does it do?     (a) turn right (b) go forward (c) 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, black–black, white–black, white–black, black–black, black–black. How many times does it turn right?
  30. 30.⬛ 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 55. 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 16. 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 4 times (left–right): white–white, white–black, white–white, black–white. How many times does it turn left?
  33. 33.⬛ 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
  34. 34.⬛ 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) go forward (c) turn left
  35. 35.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 70. What does it do?     (a) turn right (b) 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 70 and the right sensor reads 30. What does it do?     (a) turn left (b) go forward (c) turn right
  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, black–white, black–white, black–white, black–white, white–white. How many times does it turn right?
  38. 38.⬛ Why does a line follower wiggle a little as it drives? (a) it is dancing (b) its wheels are square (c) it is too cold (d) it keeps fixing its path
  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 5 times (left–right): black–black, white–black, black–white, white–black, black–black. How many times does it turn left?
  40. 40.⬛ 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 35. What does it do?     (a) go forward (b) turn left (c) turn right

Answer key

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

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