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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 225 · 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): black–black, black–black, white–white, white–black. How many times does it turn right?
  2. 2.⬛ 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) turn left (c) go forward
  3. 3.⬛ 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 65. What does it do?     (a) go forward (b) turn left (c) turn right
  4. 4.⬛ 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 40. What does it do?     (a) turn left (b) turn right (c) go forward
  5. 5.⬛ 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 20. What does it do?     (a) go forward (b) turn right (c) turn left
  6. 6.⬛ 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 right (b) 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 left (c) turn right
  8. 8.⬛ Why does a line follower wiggle a little as it drives? (a) it keeps fixing its path (b) it is too cold (c) its wheels are square (d) it is dancing
  9. 9.⬛ 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 right (b) go forward (c) turn left
  10. 10.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 28. What does it do?     (a) turn right (b) turn left
  11. 11.⬛ 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) go forward (c) turn right
  12. 12.⬛ 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
  13. 13.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) left (b) nowhere (c) right (d) backwards
  14. 14.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 58. What does it do?     (a) turn right (b) turn left
  15. 15.⬛ 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) 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 35 and the right sensor reads 30. What does it do?     (a) turn right (b) go forward (c) 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 10 and the right sensor reads 70. What does it do?     (a) turn left (b) go forward (c) turn right
  18. 18.⬛ Going too fast round a sharp bend, a line follower may … (a) grow wheels (b) lose the line (c) turn into a car (d) get heavier
  19. 19.⬛ 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 55. What does it do?     (a) go forward (b) turn right (c) turn left
  20. 20.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 45. What does it do?     (a) turn left (b) turn right
  21. 21.⬛ 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 left (b) turn right (c) go forward
  22. 22.⬛ 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, black–black, black–white, white–black, white–white. How many times does it 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 white and the right sensor sees white. What does it do?     (a) go forward (b) turn right (c) turn left
  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): white–white, white–black, white–black, black–white. How many times does it turn right?
  25. 25.⬛ 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) turn right (b) turn left (c) go forward
  26. 26.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 29. What does it do?     (a) turn right (b) 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 20 and the right sensor reads 60. 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 < 50) { turn right } else { turn left }
    The sensor reads 28. What does it do?     (a) turn left (b) turn right
  29. 29.⬛ 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
  30. 30.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 78. What does it do?     (a) turn right (b) turn left
  31. 31.⬛ 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 40. What does it do?     (a) turn right (b) go forward (c) 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 90 and the right sensor reads 15. What does it do?     (a) turn left (b) turn right (c) go forward
  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): white–white, black–black, 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 < 30) { turn right } else { turn left }
    The sensor reads 38. What does it do?     (a) turn right (b) 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 85 and the right sensor reads 90. What does it do?     (a) go forward (b) turn left (c) turn right
  36. 36.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 29. What does it do?     (a) turn left (b) 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 45 and the right sensor reads 30. What does it do?     (a) turn left (b) turn right (c) go forward
  38. 38.⬛ 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 right (b) turn left
  39. 39.⬛ 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, black–white, white–black, white–black. How many times does it 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): black–white, black–white, white–white, black–black, black–white, black–white. How many times does it turn right?

Answer key

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

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