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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 151 · 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 35. What does it do?     (a) turn left (b) turn right
  2. 2.⬛ Why does a line follower wiggle a little as it drives? (a) it keeps fixing its path (b) it is too cold (c) it is dancing (d) its wheels are square
  3. 3.⬛ Going too fast round a sharp bend, a line follower may … (a) grow wheels (b) turn into a car (c) lose the line (d) get heavier
  4. 4.⬛ 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 70. What does it do?     (a) go forward (b) turn left (c) turn right
  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): white–black, white–white, white–black, black–white, white–black. How many times does it turn right?
  6. 6.⬛ 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, white–black, white–white. How many times does it turn left?
  7. 7.⬛ 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
  8. 8.⬛ 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
  9. 9.⬛ 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, white–white, black–white, white–black. How many times does it turn right?
  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) go forward (b) turn right (c) turn left
  11. 11.⬛ 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
  12. 12.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) nowhere (b) right (c) backwards (d) 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 60 and the right sensor reads 40. What does it do?     (a) turn right (b) turn left (c) go forward
  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 white and the right sensor sees white. What does it do?     (a) turn left (b) turn right (c) go forward
  15. 15.⬛ 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 50. What does it do?     (a) go forward (b) turn right (c) turn left
  16. 16.⬛ 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 30. What does it do?     (a) turn right (b) go forward (c) turn left
  17. 17.⬛ 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 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 35 and the right sensor reads 70. What does it do?     (a) go forward (b) turn right (c) turn left
  19. 19.⬛ 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) go forward (c) 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 28. What does it do?     (a) turn right (b) 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 5 times (left–right): white–white, white–black, white–white, white–white, black–white. How many times does it turn right?
  22. 22.⬛ 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) go forward (b) turn right (c) turn left
  23. 23.⬛ 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) turn right (b) turn left (c) go forward
  24. 24.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 36. What does it do?     (a) turn left (b) turn right
  25. 25.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 21. 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 60 and the right sensor reads 35. What does it do?     (a) go forward (b) turn right (c) turn left
  27. 27.⬛ 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 55. What does it do?     (a) turn left (b) turn right (c) go forward
  28. 28.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 34. What does it do?     (a) turn left (b) turn right
  29. 29.⬛ 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
  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 4 times (left–right): black–black, black–black, white–black, 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 }
    The left sensor sees white and the right sensor sees black. What does it do?     (a) turn left (b) turn right (c) go forward
  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–white, black–white, white–black, white–white, black–black, black–black. How many times does it turn right?
  33. 33.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 79. What does it do?     (a) turn left (b) 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, white–white, black–white, black–white. How many times does it turn left?
  35. 35.⬛ 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 80. What does it do?     (a) turn left (b) turn right (c) go forward
  36. 36.⬛ 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 25. What does it do?     (a) turn left (b) go forward (c) turn right
  37. 37.⬛ A line follower runs:
    if (left < 40) { turn left } else if (right < 40) { turn right } else { go forward }
    The left sensor reads 50 and the right sensor reads 10. What does it do?     (a) turn left (b) go forward (c) turn right
  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 6 times (left–right): white–white, white–white, white–white, white–black, black–white, white–black. How many times does it turn left?
  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 85. What does it do?     (a) turn left (b) turn right (c) go forward
  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. turn left
  2. it keeps fixing its path
  3. lose the line
  4. turn left
  5. 3
  6. 1
  7. turn left
  8. turn right
  9. 1
  10. turn left
  11. turn right
  12. left
  13. go forward
  14. go forward
  15. turn left
  16. turn right
  17. turn right
  18. turn left
  19. turn right
  20. turn right
  21. 1
  22. go forward
  23. turn left
  24. turn left
  25. turn right
  26. turn right
  27. go forward
  28. turn right
  29. turn right
  30. 1
  31. turn right
  32. 1
  33. turn left
  34. 3
  35. go forward
  36. turn right
  37. turn right
  38. 1
  39. go forward
  40. go forward

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