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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 146 · 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 75 and the right sensor reads 75. What does it do?     (a) turn right (b) go forward (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 }
    The left sensor sees black and the right sensor sees white. What does it do?     (a) turn left (b) turn right (c) go forward
  3. 3.⬛ 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 80. What does it do?     (a) turn right (b) turn left (c) go forward
  4. 4.⬛ 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
  5. 5.⬛ 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 55. What does it do?     (a) go forward (b) turn left (c) turn right
  6. 6.⬛ 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 70. What does it do?     (a) turn left (b) turn right (c) go forward
  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 black and the right sensor sees white. What does it do?     (a) go forward (b) turn left (c) turn right
  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 white and the right sensor sees white. What does it do?     (a) turn left (b) go forward (c) turn right
  9. 9.⬛ 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 80. What does it do?     (a) turn left (b) go forward (c) 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 4 times (left–right): white–white, black–black, black–black, 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 }
    It checks its sensors 5 times (left–right): black–white, white–white, white–black, black–white, white–black. How many times does it turn left?
  12. 12.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) left (b) backwards (c) right (d) nowhere
  13. 13.⬛ 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 left (b) turn right
  14. 14.⬛ 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 40. What does it do?     (a) turn left (b) turn right (c) go forward
  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–white, white–white, white–white, white–black, black–black. How many times does it 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 75 and the right sensor reads 70. What does it do?     (a) turn right (b) turn left (c) go forward
  17. 17.⬛ 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 10. What does it do?     (a) turn left (b) go forward (c) turn right
  18. 18.⬛ 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–white, white–black, black–white, white–white. How many times does it turn right?
  19. 19.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 8. What does it do?     (a) turn right (b) 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 6 times (left–right): white–white, black–black, black–black, black–black, black–white, white–white. How many times does it turn left?
  21. 21.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 43. What does it do?     (a) turn right (b) turn left
  22. 22.⬛ 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) turn right (c) go forward
  23. 23.⬛ Going too fast round a sharp bend, a line follower may … (a) turn into a car (b) grow wheels (c) lose the line (d) get heavier
  24. 24.⬛ 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
  25. 25.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 63. What does it do?     (a) turn right (b) 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 55 and the right sensor reads 55. What does it do?     (a) go forward (b) turn left (c) turn right
  27. 27.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 46. What does it do?     (a) turn left (b) turn right
  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 white and the right sensor sees black. What does it do?     (a) turn left (b) go forward (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 15 and the right sensor reads 35. What does it do?     (a) turn right (b) go forward (c) turn left
  30. 30.⬛ 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–black. How many times does it 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 4 times (left–right): white–white, white–black, white–white, black–white. How many times does it turn left?
  32. 32.⬛ 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 left (b) go forward (c) turn right
  33. 33.⬛ 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 40. What does it do?     (a) go forward (b) turn right (c) turn left
  34. 34.⬛ 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 left (b) turn right (c) go forward
  35. 35.⬛ 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
  36. 36.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 32. What does it do?     (a) turn left (b) 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 50 and the right sensor reads 35. What does it do?     (a) go forward (b) turn right (c) turn left
  38. 38.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 41. 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 }
    It checks its sensors 6 times (left–right): white–black, white–white, black–white, black–white, white–black, white–white. How many times does it turn left?
  40. 40.⬛ 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

Answer key

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

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