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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 76 · 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 (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 right (b) go forward (c) 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 55 and the right sensor reads 85. What does it do?     (a) turn right (b) go forward (c) turn left
  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 30. What does it do?     (a) turn left (b) go forward (c) turn right
  4. 4.⬛ 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
  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 15. What does it do?     (a) turn right (b) turn left (c) go forward
  6. 6.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 35. What does it do?     (a) turn left (b) turn right
  7. 7.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 18. What does it do?     (a) turn left (b) turn right
  8. 8.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 54. What does it do?     (a) turn right (b) turn left
  9. 9.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) left (b) right (c) backwards (d) nowhere
  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 white. What does it do?     (a) turn right (b) go forward (c) 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 6 times (left–right): white–black, black–black, white–black, black–white, black–black, black–black. How many times does it turn right?
  12. 12.⬛ 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–white, black–white, white–black. How many times does it turn left?
  13. 13.⬛ 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 15. What does it do?     (a) turn right (b) turn left (c) go forward
  14. 14.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 33. What does it do?     (a) turn right (b) turn left
  15. 15.⬛ 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
  16. 16.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 34. What does it do?     (a) turn right (b) 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 80 and the right sensor reads 20. What does it do?     (a) turn left (b) go forward (c) turn right
  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 15. What does it do?     (a) turn right (b) go forward (c) turn left
  19. 19.⬛ 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, black–black, white–black, white–white. How many times does it turn right?
  20. 20.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 61. What does it do?     (a) turn right (b) turn left
  21. 21.⬛ Why does a line follower wiggle a little as it drives? (a) it is dancing (b) it is too cold (c) it keeps fixing its path (d) its wheels are square
  22. 22.⬛ 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 10. What does it do?     (a) go forward (b) turn right (c) turn left
  23. 23.⬛ 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 right (b) turn left (c) go forward
  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) turn right (b) turn left (c) go forward
  25. 25.⬛ 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, black–black, white–white, white–white. How many times does it 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–white, black–black. 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 }
    It checks its sensors 4 times (left–right): black–black, black–white, white–black, black–white. How many times does it 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 65 and the right sensor reads 35. What does it do?     (a) go forward (b) turn right (c) turn left
  29. 29.⬛ 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?
  30. 30.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 19. What does it do?     (a) turn left (b) turn right
  31. 31.⬛ 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 50. What does it do?     (a) go forward (b) turn right (c) turn left
  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 4 times (left–right): black–black, black–black, black–white, black–black. How many times does it turn right?
  33. 33.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 44. What does it do?     (a) turn right (b) turn left
  34. 34.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 38. What does it do?     (a) turn left (b) 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 90 and the right sensor reads 45. 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 < 40) { turn right } else { turn left }
    The sensor reads 30. What does it do?     (a) turn left (b) turn right
  37. 37.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 57. What does it do?     (a) turn right (b) 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 4 times (left–right): black–black, white–white, black–black, white–white. How many times does it turn right?
  39. 39.⬛ 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
  40. 40.⬛ 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 60. What does it do?     (a) go forward (b) turn left (c) turn right

Answer key

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

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