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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 50 · 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.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) right (b) left (c) backwards (d) nowhere
  2. 2.⬛ 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) turn left (c) go forward
  3. 3.⬛ 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
  4. 4.⬛ Going too fast round a sharp bend, a line follower may … (a) grow wheels (b) lose the line (c) get heavier (d) turn into a car
  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 black. What does it do?     (a) turn right (b) go forward (c) turn left
  6. 6.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 38. What does it do?     (a) turn left (b) turn right
  7. 7.⬛ 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 60. 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 6 times (left–right): white–white, black–black, black–black, white–white, black–black, black–white. How many times does it turn left?
  9. 9.⬛ 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
  10. 10.⬛ 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 left (b) turn right
  11. 11.⬛ Why does a line follower wiggle a little as it drives? (a) it is dancing (b) it keeps fixing its path (c) it is too cold (d) its wheels are square
  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) go forward (b) turn right (c) turn left
  13. 13.⬛ 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–black, white–white. How many times does it turn left?
  14. 14.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 29. What does it do?     (a) turn right (b) turn left
  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): black–black, white–black, white–black, black–black, white–white. How many times does it turn right?
  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, white–black, white–white, white–white, black–black. How many times does it turn left?
  17. 17.⬛ 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 40. What does it do?     (a) turn right (b) go forward (c) turn left
  18. 18.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 55. What does it do?     (a) turn left (b) turn right
  19. 19.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 24. What does it do?     (a) turn left (b) turn right
  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 5 times (left–right): white–black, black–white, black–white, black–white, white–white. How many times does it turn right?
  21. 21.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 10 and the right sensor reads 80. What does it do?     (a) go forward (b) turn right (c) turn left
  22. 22.⬛ 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 right (b) go forward (c) turn left
  23. 23.⬛ 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) turn right (c) go forward
  24. 24.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 41. 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 15 and the right sensor reads 65. What does it do?     (a) go forward (b) turn right (c) 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 5 times (left–right): white–black, black–white, white–white, black–black, black–white. How many times does it 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 53. 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 black and the right sensor sees black. What does it do?     (a) go forward (b) turn right (c) turn left
  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 85. What does it do?     (a) go forward (b) turn left (c) 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 90 and the right sensor reads 90. What does it do?     (a) go forward (b) turn right (c) turn left
  31. 31.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 62. What does it do?     (a) turn left (b) turn right
  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 6 times (left–right): white–black, black–white, black–black, white–black, white–black, white–white. How many times does it 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 5 times (left–right): black–white, black–white, black–white, white–black, white–black. How many times does it 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 35 and the right sensor reads 85. What does it do?     (a) turn right (b) go forward (c) turn left
  35. 35.⬛ 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–black, black–white, white–white. How many times does it turn right?
  36. 36.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 46. 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 4 times (left–right): black–black, white–white, 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): white–black, white–white, white–white, black–black, white–white. How many times does it turn right?
  39. 39.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 47. What does it do?     (a) turn right (b) 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 white. What does it do?     (a) turn right (b) turn left (c) go forward

Answer key

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

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