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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 185 · 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.⬛ Why does a line follower wiggle a little as it drives? (a) its wheels are square (b) it keeps fixing its path (c) it is too cold (d) it is dancing
  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 black and the right sensor sees white. What does it do?     (a) turn right (b) go forward (c) turn left
  3. 3.⬛ 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–black, black–black, black–black, white–black, white–black. How many times does it 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 6 times (left–right): black–black, white–white, white–black, black–black, black–black, white–white. 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 }
    It checks its sensors 5 times (left–right): black–white, white–white, white–black, black–white, black–white. How many times does it turn left?
  6. 6.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) nowhere (b) right (c) backwards (d) 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 4 times (left–right): white–white, black–black, white–white, 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 85 and the right sensor reads 80. What does it do?     (a) turn left (b) turn right (c) go forward
  9. 9.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 56. What does it do?     (a) turn right (b) turn left
  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 left (b) go forward (c) turn right
  11. 11.⬛ 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 20. What does it do?     (a) turn right (b) go forward (c) turn left
  12. 12.⬛ 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
  13. 13.⬛ 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 25. What does it do?     (a) turn left (b) turn right (c) go forward
  14. 14.⬛ 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 right (b) turn left
  15. 15.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 52. 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 15. What does it do?     (a) turn left (b) turn right
  17. 17.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 60. What does it do?     (a) turn right (b) turn left
  18. 18.⬛ 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 80. What does it do?     (a) turn left (b) go forward (c) turn right
  19. 19.⬛ 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 30. What does it do?     (a) go forward (b) turn left (c) turn right
  20. 20.⬛ 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 15. What does it do?     (a) turn right (b) turn left (c) go forward
  21. 21.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 50. What does it do?     (a) turn right (b) turn left
  22. 22.⬛ Going too fast round a sharp bend, a line follower may … (a) get heavier (b) turn into a car (c) grow wheels (d) lose the line
  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, white–white, white–black, black–black, black–white, white–white. How many times does it turn left?
  24. 24.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 53. 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 20 and the right sensor reads 25. 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 < 30) { turn right } else { turn left }
    The sensor reads 12. What does it do?     (a) turn left (b) turn right
  27. 27.⬛ 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 right (b) go forward (c) 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 35 and the right sensor reads 10. What does it do?     (a) turn left (b) go forward (c) turn right
  29. 29.⬛ 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
  30. 30.⬛ 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 90. 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 58. 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 black. What does it do?     (a) go forward (b) turn left (c) turn right
  33. 33.⬛ 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–white, white–white. How many times does it turn left?
  34. 34.⬛ 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, white–black, white–white. How many times does it turn right?
  35. 35.⬛ 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 40. What does it do?     (a) turn right (b) turn left (c) go forward
  36. 36.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 56. What does it do?     (a) turn left (b) 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 5 times (left–right): white–white, white–black, black–black, black–white, white–white. How many times does it turn left?
  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 5 times (left–right): black–white, white–white, white–black, white–black, white–white. How many times does it turn right?
  39. 39.⬛ 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 10. What does it do?     (a) go forward (b) turn right (c) turn left
  40. 40.⬛ 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 left (b) turn right

Answer key

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

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