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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 121 · 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 }
    It checks its sensors 4 times (left–right): white–black, white–white, white–white, black–white. How many times does it turn left?
  2. 2.⬛ 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 70. 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 }
    It checks its sensors 6 times (left–right): white–white, white–white, black–black, black–white, black–black, white–white. How many times does it turn left?
  4. 4.⬛ Why does a line follower wiggle a little as it drives? (a) it keeps fixing its path (b) its wheels are square (c) it is too cold (d) it is dancing
  5. 5.⬛ 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 25. What does it do?     (a) turn left (b) turn right (c) go forward
  6. 6.⬛ 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 right (b) go forward (c) turn left
  7. 7.⬛ 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
  8. 8.⬛ 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 left (c) turn right
  9. 9.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 69. What does it do?     (a) turn right (b) 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 25 and the right sensor reads 40. 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 60 and the right sensor reads 45. What does it do?     (a) turn left (b) turn right (c) go forward
  12. 12.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 51. What does it do?     (a) turn left (b) turn right
  13. 13.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) left (b) backwards (c) right (d) nowhere
  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 4 times (left–right): white–black, white–black, black–white, black–white. How many times does it turn right?
  15. 15.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 75. What does it do?     (a) turn left (b) turn right
  16. 16.⬛ 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 85. What does it do?     (a) turn left (b) go forward (c) turn right
  17. 17.⬛ 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, black–white, black–white. How many times does it 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 70 and the right sensor reads 25. What does it do?     (a) go forward (b) turn right (c) turn left
  19. 19.⬛ 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 left (b) 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 85. What does it do?     (a) go forward (b) turn right (c) 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 69. 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 black and the right sensor sees black. What does it do?     (a) turn left (b) turn right (c) go forward
  23. 23.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 38. What does it do?     (a) turn left (b) turn right
  24. 24.⬛ 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, white–white, white–white. How many times does it turn right?
  25. 25.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 1. What does it do?     (a) turn left (b) turn right
  26. 26.⬛ 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 90. What does it do?     (a) turn left (b) turn right (c) go forward
  27. 27.⬛ 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 25. What does it do?     (a) go forward (b) turn left (c) turn right
  28. 28.⬛ 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 right (b) turn left
  29. 29.⬛ 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
  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 5 times (left–right): white–white, black–white, white–black, white–white, white–white. 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 6 times (left–right): black–white, white–white, black–black, white–black, black–white, white–white. How many times does it turn left?
  32. 32.⬛ 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 right (b) go forward (c) 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 40 and the right sensor reads 50. What does it do?     (a) turn left (b) go forward (c) turn right
  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–black. 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 45 and the right sensor reads 40. What does it do?     (a) go forward (b) turn left (c) turn right
  36. 36.⬛ 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 50. What does it do?     (a) turn right (b) turn left (c) go forward
  37. 37.⬛ 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 right (b) turn left
  38. 38.⬛ 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) turn right (c) go forward
  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 90. What does it do?     (a) turn right (b) go forward (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 6 times (left–right): white–white, white–white, black–white, white–black, white–black, black–white. How many times does it turn right?

Answer key

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

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