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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 114 · 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.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) left (b) right (c) backwards (d) nowhere
  2. 2.⬛ 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–black, black–white, black–white. How many times does it turn right?
  3. 3.⬛ 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
  4. 4.⬛ Going too fast round a sharp bend, a line follower may … (a) get heavier (b) grow wheels (c) lose the line (d) turn into a car
  5. 5.⬛ 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 left (b) turn right
  6. 6.⬛ 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 85. What does it do?     (a) turn left (b) go forward (c) turn right
  7. 7.⬛ 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–white, black–white. How many times does it turn left?
  8. 8.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 23. What does it do?     (a) turn left (b) turn right
  9. 9.⬛ 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 65. What does it do?     (a) turn right (b) go forward (c) turn left
  10. 10.⬛ 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, black–white, white–black. How many times does it 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 48. 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 65 and the right sensor reads 85. 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 < 40) { turn right } else { turn left }
    The sensor reads 17. What does it do?     (a) turn left (b) turn right
  14. 14.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 73. What does it do?     (a) turn left (b) turn right
  15. 15.⬛ 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 40. What does it do?     (a) turn left (b) turn right (c) go forward
  16. 16.⬛ 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 left (b) 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 black and the right sensor sees black. What does it do?     (a) turn left (b) turn right (c) go forward
  18. 18.⬛ 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 90. What does it do?     (a) turn left (b) turn right (c) go forward
  19. 19.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 26. What does it do?     (a) turn left (b) turn right
  20. 20.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 26. What does it do?     (a) turn left (b) turn right
  21. 21.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 1. What does it do?     (a) turn left (b) 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 40 and the right sensor reads 45. What does it do?     (a) go forward (b) turn left (c) turn right
  23. 23.⬛ 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 right (b) 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 5 times (left–right): white–white, white–black, white–white, white–white, black–black. How many times does it turn left?
  25. 25.⬛ 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 90. What does it do?     (a) go forward (b) turn left (c) turn right
  26. 26.⬛ 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–white, black–black, white–white. How many times does it turn left?
  27. 27.⬛ 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
  28. 28.⬛ 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
  29. 29.⬛ 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 left (b) turn right
  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, white–white, black–white, white–white, white–black, white–black. 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 42. What does it do?     (a) turn left (b) turn right
  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 5 times (left–right): black–black, white–black, black–white, black–white, black–black. How many times does it 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 30 and the right sensor reads 60. What does it do?     (a) go forward (b) turn left (c) 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 5 times (left–right): black–black, black–black, black–white, black–black, black–white. How many times does it turn left?
  35. 35.⬛ 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
  36. 36.⬛ 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 30. What does it do?     (a) turn right (b) go forward (c) turn left
  37. 37.⬛ 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) go forward (c) turn left
  38. 38.⬛ 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
  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 5 times (left–right): white–white, white–black, white–black, white–white, white–black. How many times does it turn left?
  40. 40.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 43. What does it do?     (a) turn left (b) turn right

Answer key

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

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