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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 195 · 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 3. What does it do?     (a) turn right (b) turn left
  2. 2.⬛ Why does a line follower wiggle a little as it drives? (a) its wheels are square (b) it is dancing (c) it is too cold (d) it keeps fixing its path
  3. 3.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 55. What does it do?     (a) turn right (b) turn left
  4. 4.⬛ 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 left (b) turn right
  5. 5.⬛ 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
  6. 6.⬛ 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
  7. 7.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 11. 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 }
    The left sensor sees white and the right sensor sees white. What does it do?     (a) turn right (b) go forward (c) turn left
  9. 9.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) right (b) left (c) nowhere (d) backwards
  10. 10.⬛ 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
  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 5 times (left–right): white–black, white–white, white–black, black–black, white–white. How many times does it turn right?
  12. 12.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 56. What does it do?     (a) turn right (b) turn left
  13. 13.⬛ 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) go forward (b) turn right (c) turn left
  14. 14.⬛ 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 55. What does it do?     (a) turn right (b) go forward (c) turn left
  15. 15.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 63. What does it do?     (a) turn right (b) 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 80. What does it do?     (a) go forward (b) turn right (c) turn left
  17. 17.⬛ 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
  18. 18.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 21. What does it do?     (a) turn left (b) turn right
  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 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, black–white, white–black, black–black, white–black. How many times does it turn left?
  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 white and the right sensor sees white. What does it do?     (a) turn right (b) turn left (c) go forward
  22. 22.⬛ 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 right (b) turn left
  23. 23.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 39. What does it do?     (a) turn left (b) turn right
  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–white, white–white. How many times does it turn left?
  25. 25.⬛ 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–white, white–black, black–white, black–white. How many times does it turn left?
  26. 26.⬛ A one-sensor robot follows the edge of a line:
    if (light < 50) { turn right } else { turn left }
    The sensor reads 35. What does it do?     (a) turn left (b) turn right
  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 4 times (left–right): black–white, white–white, black–white, white–black. How many times does it turn left?
  28. 28.⬛ 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 45. What does it do?     (a) go forward (b) turn left (c) turn right
  29. 29.⬛ 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–white, white–white. How many times does it turn right?
  30. 30.⬛ Going too fast round a sharp bend, a line follower may … (a) get heavier (b) turn into a car (c) grow wheels (d) lose the line
  31. 31.⬛ A one-sensor robot follows the edge of a line:
    if (light < 40) { turn right } else { turn left }
    The sensor reads 52. What does it do?     (a) turn right (b) 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 35 and the right sensor reads 50. What does it do?     (a) turn left (b) turn right (c) go forward
  33. 33.⬛ 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
  34. 34.⬛ 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 70. What does it do?     (a) turn right (b) turn left (c) go forward
  35. 35.⬛ 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 45. What does it do?     (a) go forward (b) turn right (c) 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 70 and the right sensor reads 70. What does it do?     (a) go forward (b) turn right (c) turn left
  37. 37.⬛ 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 70. What does it do?     (a) turn left (b) turn right (c) go forward
  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) go forward (b) turn right (c) turn left
  39. 39.⬛ 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
  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): white–white, black–white, black–white, black–black, white–black, black–black. How many times does it turn right?

Answer key

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

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