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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 163 · 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 }
    The left sensor sees white and the right sensor sees black. What does it do?     (a) turn left (b) go forward (c) turn right
  2. 2.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 45. What does it do?     (a) turn left (b) turn right
  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 5 times (left–right): white–black, white–white, black–black, white–white, black–white. How many times does it 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 white and the right sensor sees white. What does it do?     (a) turn right (b) turn left (c) go forward
  5. 5.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 16. What does it do?     (a) turn left (b) 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 5 times (left–right): white–white, white–white, black–white, black–white, white–white. How many times does it turn left?
  7. 7.⬛ 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
  8. 8.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 14. What does it do?     (a) turn right (b) turn left
  9. 9.⬛ 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 left (b) go forward (c) turn right
  10. 10.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) backwards (b) right (c) nowhere (d) left
  11. 11.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 22. What does it do?     (a) turn left (b) turn right
  12. 12.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 59. What does it do?     (a) turn right (b) 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 40 and the right sensor reads 20. What does it do?     (a) turn left (b) turn right (c) go forward
  14. 14.⬛ Going too fast round a sharp bend, a line follower may … (a) turn into a car (b) get heavier (c) grow wheels (d) lose the line
  15. 15.⬛ 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 55. What does it do?     (a) go forward (b) turn left (c) 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 70 and the right sensor reads 45. What does it do?     (a) go forward (b) turn left (c) turn right
  17. 17.⬛ 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) turn left (c) go forward
  18. 18.⬛ 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 right (b) turn left
  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 25. What does it do?     (a) turn left (b) go forward (c) 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 65 and the right sensor reads 25. What does it do?     (a) go forward (b) turn left (c) 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 30 and the right sensor reads 45. What does it do?     (a) turn right (b) turn left (c) go forward
  22. 22.⬛ 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 60. What does it do?     (a) go forward (b) turn right (c) turn left
  23. 23.⬛ Why does a line follower wiggle a little as it drives? (a) it is too cold (b) its wheels are square (c) it keeps fixing its path (d) it is dancing
  24. 24.⬛ 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 10. What does it do?     (a) turn right (b) go forward (c) turn left
  25. 25.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 13. 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 90 and the right sensor reads 10. 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 55 and the right sensor reads 90. What does it do?     (a) turn right (b) turn left (c) go forward
  28. 28.⬛ 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?
  29. 29.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 4. What does it do?     (a) turn left (b) 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 40 and the right sensor reads 15. What does it do?     (a) turn right (b) turn left (c) go forward
  31. 31.⬛ 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 85. What does it do?     (a) turn left (b) turn right (c) go forward
  32. 32.⬛ 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 90. What does it do?     (a) turn left (b) go forward (c) 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 4 times (left–right): black–black, white–white, white–white, black–black. How many times does it turn left?
  34. 34.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 12. What does it do?     (a) turn left (b) turn right
  35. 35.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 17. What does it do?     (a) turn right (b) turn left
  36. 36.⬛ 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 85. What does it do?     (a) turn right (b) turn left (c) go forward
  37. 37.⬛ 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 left (b) turn right (c) go forward
  38. 38.⬛ 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) go forward (c) turn right
  39. 39.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 3. What does it do?     (a) turn right (b) turn left
  40. 40.⬛ 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 50. What does it do?     (a) go forward (b) turn left (c) turn right

Answer key

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

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