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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 20 · 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 70 and the right sensor reads 85. What does it do?     (a) go forward (b) turn left (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 }
    It checks its sensors 6 times (left–right): black–black, white–white, white–black, black–white, white–white, 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 60 and the right sensor reads 65. What does it do?     (a) turn right (b) go forward (c) turn left
  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 4 times (left–right): white–white, white–black, black–white, white–black. How many times does it turn left?
  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 right (b) go forward (c) turn left
  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 5 times (left–right): black–black, black–white, white–white, black–white, black–black. How many times does it 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 6 times (left–right): white–white, black–black, black–white, white–white, black–black, white–black. How many times does it turn right?
  8. 8.⬛ 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 65. What does it do?     (a) go forward (b) turn right (c) turn left
  9. 9.⬛ 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 50. What does it do?     (a) turn right (b) go forward (c) turn left
  10. 10.⬛ 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 left (b) turn right (c) go forward
  11. 11.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 21. What does it do?     (a) turn right (b) turn left
  12. 12.⬛ 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 80. What does it do?     (a) turn right (b) turn left (c) go forward
  13. 13.⬛ Going too fast round a sharp bend, a line follower may … (a) lose the line (b) get heavier (c) turn into a car (d) grow wheels
  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 5 times (left–right): white–white, black–white, white–white, black–black, black–white. How many times does it turn right?
  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 5 times (left–right): white–black, white–white, white–white, white–black, black–white. How many times does it turn right?
  16. 16.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 35. What does it do?     (a) turn left (b) turn right
  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 right (b) turn left (c) go forward
  18. 18.⬛ Why does a line follower wiggle a little as it drives? (a) it keeps fixing its path (b) it is too cold (c) it is dancing (d) its wheels are square
  19. 19.⬛ 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 right (c) turn left
  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 4 times (left–right): white–white, white–black, white–white, black–black. How many times does it turn left?
  21. 21.⬛ 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) turn left (c) go forward
  22. 22.⬛ 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 40. What does it do?     (a) turn left (b) turn right (c) go forward
  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 6 times (left–right): white–white, black–white, white–white, black–white, white–white, white–white. How many times does it turn left?
  24. 24.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) left (b) right (c) nowhere (d) backwards
  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 black and the right sensor sees white. What does it do?     (a) go forward (b) turn right (c) turn left
  26. 26.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 70. What does it do?     (a) turn left (b) 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 19. What does it do?     (a) turn left (b) turn right
  28. 28.⬛ 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) go forward (b) turn left (c) turn right
  29. 29.⬛ 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 35. What does it do?     (a) turn left (b) turn right (c) go forward
  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 left (b) go forward (c) 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–white, black–black, white–white, black–black, white–white, black–white. How many times does it 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–white, white–white, white–white. How many times does it turn left?
  33. 33.⬛ 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 60. What does it do?     (a) turn left (b) turn right (c) go forward
  34. 34.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 16. What does it do?     (a) turn left (b) turn right
  35. 35.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 29. What does it do?     (a) turn right (b) turn left
  36. 36.⬛ 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, black–white, black–black, white–white, black–black. How many times does it 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 36. What does it do?     (a) turn right (b) turn left
  38. 38.⬛ 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
  39. 39.⬛ 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 right (c) turn left
  40. 40.⬛ 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, white–black, black–black. How many times does it turn right?

Answer key

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

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