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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 14 · 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 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) turn left (c) go forward
  2. 2.⬛ 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 left (b) turn right (c) go forward
  3. 3.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) right (b) backwards (c) nowhere (d) left
  4. 4.⬛ 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 left (b) go forward (c) turn right
  5. 5.⬛ 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 left (b) turn right (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 4 times (left–right): white–white, black–black, white–white, white–black. How many times does it turn left?
  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): black–black, black–white, white–white, white–white, black–black, black–black. How many times does it turn left?
  8. 8.⬛ 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
  9. 9.⬛ 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 90. What does it do?     (a) go forward (b) turn right (c) turn left
  10. 10.⬛ 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 left (b) turn right
  11. 11.⬛ 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, white–white, white–white, white–black, white–white. How many times does it turn right?
  12. 12.⬛ 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 35. What does it do?     (a) turn right (b) go forward (c) turn left
  13. 13.⬛ Why does a line follower wiggle a little as it drives? (a) it is too cold (b) it is dancing (c) its wheels are square (d) it keeps fixing its path
  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–black, black–white, white–black, white–black, white–black. How many times does it turn left?
  15. 15.⬛ 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 left (b) 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 68. What does it do?     (a) turn right (b) turn left
  17. 17.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 42. What does it do?     (a) turn left (b) turn right
  18. 18.⬛ 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
  19. 19.⬛ 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 80. 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 75 and the right sensor reads 25. What does it do?     (a) turn right (b) turn left (c) go forward
  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 white. 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–white, white–black, white–white, black–white, white–black, black–white. How many times does it turn left?
  23. 23.⬛ 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
  24. 24.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 15. What does it do?     (a) turn left (b) turn right
  25. 25.⬛ 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) go forward (c) turn right
  26. 26.⬛ 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
  27. 27.⬛ 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 right (b) turn left
  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 80. What does it do?     (a) turn right (b) turn left (c) go forward
  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–white, white–black, white–black, black–black, white–white, black–black. How many times does it turn left?
  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 60. What does it do?     (a) turn right (b) go forward (c) turn left
  31. 31.⬛ 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 10. What does it do?     (a) turn right (b) go forward (c) turn left
  32. 32.⬛ 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
  33. 33.⬛ 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
  34. 34.⬛ 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) turn right (b) turn left (c) go forward
  35. 35.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 60. 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 85 and the right sensor reads 10. 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 25 and the right sensor reads 80. What does it do?     (a) turn left (b) turn right (c) go forward
  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–white, black–white, black–white, black–black. How many times does it turn left?
  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, white–black, white–white, white–black. How many times does it turn right?
  40. 40.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 28. What does it do?     (a) turn left (b) turn right

Answer key

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

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