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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 25 · 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.⬛ Why does a line follower wiggle a little as it drives? (a) it is too cold (b) it is dancing (c) its wheels are square (d) it keeps fixing its path
  2. 2.⬛ Going too fast round a sharp bend, a line follower may … (a) turn into a car (b) grow wheels (c) get heavier (d) lose the line
  3. 3.⬛ 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 35. What does it do?     (a) turn right (b) turn left (c) go forward
  4. 4.⬛ 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 80. What does it do?     (a) turn left (b) go forward (c) turn right
  5. 5.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) right (b) nowhere (c) backwards (d) left
  6. 6.⬛ 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 right (b) turn left
  7. 7.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 13. What does it do?     (a) turn left (b) turn right
  8. 8.⬛ 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, black–black, white–black, white–white, white–white. How many times does it turn right?
  9. 9.⬛ 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
  10. 10.⬛ 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 45. 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 < 40) { turn right } else { turn left }
    The sensor reads 37. What does it do?     (a) turn left (b) 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 70 and the right sensor reads 90. What does it do?     (a) turn left (b) go forward (c) turn right
  13. 13.⬛ 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 left (b) turn right
  14. 14.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { 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 }
    It checks its sensors 4 times (left–right): white–white, white–white, black–white, white–black. How many times does it 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 45 and the right sensor reads 90. What does it do?     (a) turn left (b) go forward (c) turn right
  17. 17.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 70. What does it do?     (a) turn left (b) 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 90. What does it do?     (a) turn right (b) turn left (c) go forward
  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–black. How many times does it turn left?
  20. 20.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 52. What does it do?     (a) turn right (b) turn left
  21. 21.⬛ 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 50. 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 80 and the right sensor reads 55. What does it do?     (a) turn right (b) turn left (c) go forward
  23. 23.⬛ 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–white, white–black, white–white. How many times does it turn left?
  24. 24.⬛ 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 70. What does it do?     (a) go forward (b) turn left (c) turn right
  25. 25.⬛ 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 left (b) go forward (c) 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 20 and the right sensor reads 85. What does it do?     (a) turn right (b) turn left (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 20 and the right sensor reads 75. What does it do?     (a) turn left (b) go forward (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 45 and the right sensor reads 20. 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 69. What does it do?     (a) turn right (b) turn left
  30. 30.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 54. 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 20. What does it do?     (a) go forward (b) turn left (c) turn right
  32. 32.⬛ 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
  33. 33.⬛ 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
  34. 34.⬛ 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) go forward (c) 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 25 and the right sensor reads 20. What does it do?     (a) go forward (b) turn left (c) turn right
  36. 36.⬛ 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) turn right (c) go forward
  37. 37.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 53. 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 6 times (left–right): black–white, white–white, white–white, white–white, white–white, white–white. How many times does it turn left?
  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 black and the right sensor sees black. What does it do?     (a) turn right (b) turn left (c) go forward
  40. 40.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 28. What does it do?     (a) turn left (b) turn right

Answer key

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

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