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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 134 · 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 58. What does it do?     (a) turn right (b) turn left
  2. 2.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) right (b) left (c) backwards (d) nowhere
  3. 3.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 51. What does it do?     (a) turn right (b) turn left
  4. 4.⬛ 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, white–white, black–black, black–white, white–white, white–black. How many times does it turn left?
  5. 5.⬛ Going too fast round a sharp bend, a line follower may … (a) grow wheels (b) get heavier (c) lose the line (d) turn into a car
  6. 6.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 31. What does it do?     (a) turn left (b) turn right
  7. 7.⬛ 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) turn left (c) go forward
  8. 8.⬛ 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
  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 6 times (left–right): white–black, black–black, white–white, black–white, black–black, black–white. How many times does it turn left?
  10. 10.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 44. What does it do?     (a) turn right (b) 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 4 times (left–right): black–white, black–black, white–black, white–white. How many times does it turn left?
  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 4 times (left–right): black–white, white–white, white–black, black–black. How many times does it turn left?
  13. 13.⬛ 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
  14. 14.⬛ 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 60. What does it do?     (a) turn right (b) turn left (c) go forward
  15. 15.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 71. What does it do?     (a) turn left (b) turn right
  16. 16.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 53. What does it do?     (a) turn right (b) turn left
  17. 17.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 46. What does it do?     (a) turn left (b) turn right
  18. 18.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 15. 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 25 and the right sensor reads 40. What does it do?     (a) turn right (b) turn left (c) go forward
  20. 20.⬛ 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, white–white, white–white. How many times does it turn right?
  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 6 times (left–right): white–white, white–white, black–white, black–black, white–black, white–black. 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 30 and the right sensor reads 65. What does it do?     (a) turn right (b) go forward (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 }
    It checks its sensors 5 times (left–right): black–white, white–white, black–white, white–black, white–white. How many times does it turn left?
  24. 24.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 36. What does it do?     (a) turn right (b) 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 14. What does it do?     (a) turn right (b) turn left
  26. 26.⬛ Why does a line follower wiggle a little as it drives? (a) it is dancing (b) it keeps fixing its path (c) its wheels are square (d) it is too cold
  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 5 times (left–right): white–black, black–black, white–white, white–black, black–black. How many times does it turn left?
  28. 28.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 21. 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 50 and the right sensor reads 15. What does it do?     (a) turn right (b) go forward (c) 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 6 times (left–right): black–white, black–white, white–white, black–black, white–black, black–white. How many times does it turn right?
  31. 31.⬛ 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
  32. 32.⬛ 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 right (b) turn left
  33. 33.⬛ 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 45. What does it do?     (a) turn right (b) turn left (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 65 and the right sensor reads 35. What does it do?     (a) turn left (b) turn right (c) go forward
  35. 35.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 12. What does it do?     (a) turn left (b) turn right
  36. 36.⬛ 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
  37. 37.⬛ 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–white, black–black, white–white. How many times does it turn right?
  38. 38.⬛ 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) go forward (b) turn right (c) turn left
  39. 39.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 43. What does it do?     (a) turn left (b) turn right
  40. 40.⬛ 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 left (c) turn right

Answer key

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

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