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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 85 · 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 one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 5. What does it do?     (a) turn right (b) turn left
  2. 2.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) nowhere (b) right (c) left (d) backwards
  3. 3.⬛ 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) turn left (c) go forward
  4. 4.⬛ Why does a line follower wiggle a little as it drives? (a) it is dancing (b) its wheels are square (c) it keeps fixing its path (d) it is too cold
  5. 5.⬛ 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 15. What does it do?     (a) turn right (b) turn left (c) go forward
  6. 6.⬛ 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
  7. 7.⬛ 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
  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 white and the right sensor sees black. What does it do?     (a) turn left (b) turn right (c) go forward
  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 white and the right sensor sees black. What does it do?     (a) turn right (b) go forward (c) 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 20 and the right sensor reads 80. What does it do?     (a) go forward (b) turn right (c) turn left
  11. 11.⬛ 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 35. What does it do?     (a) turn left (b) go forward (c) 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 25 and the right sensor reads 90. 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 5 times (left–right): black–black, white–white, white–black, black–white, white–white. How many times does it turn right?
  14. 14.⬛ 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
  15. 15.⬛ 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 80. What does it do?     (a) go forward (b) turn right (c) turn left
  16. 16.⬛ 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
  17. 17.⬛ 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 25. What does it do?     (a) turn right (b) turn left (c) go forward
  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 4 times (left–right): black–white, white–black, black–black, white–black. How many times does it 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 40 and the right sensor reads 45. What does it do?     (a) turn right (b) turn left (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 30 and the right sensor reads 90. What does it do?     (a) turn right (b) go forward (c) turn left
  21. 21.⬛ 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, white–black, black–black. How many times does it turn left?
  22. 22.⬛ 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
  23. 23.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 20. What does it do?     (a) turn left (b) turn right
  24. 24.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 64. What does it do?     (a) turn left (b) 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 65. What does it do?     (a) turn left (b) turn right
  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–white, white–white, white–black, black–black, white–white. How many times does it turn left?
  27. 27.⬛ 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
  28. 28.⬛ 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 80. What does it do?     (a) turn right (b) go forward (c) turn left
  29. 29.⬛ 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
  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 6 times (left–right): black–black, white–white, black–black, white–white, white–black, black–white. How many times does it turn left?
  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): black–black, white–white, black–white, white–white. How many times does it turn right?
  32. 32.⬛ 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 25. What does it do?     (a) go forward (b) turn right (c) turn left
  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 6 times (left–right): white–black, black–white, white–black, white–white, white–white, black–black. How many times does it turn right?
  34. 34.⬛ 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 left (b) turn right
  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): white–black, white–white, black–black, black–black. How many times does it turn left?
  36. 36.⬛ 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
  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–black, black–white, white–black. How many times does it turn right?
  38. 38.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 42. What does it do?     (a) turn left (b) 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 90 and the right sensor reads 45. What does it do?     (a) turn right (b) go forward (c) turn left
  40. 40.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 40. What does it do?     (a) turn right (b) turn left

Answer key

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

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