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Robotics Worksheet: Line Follower Program

Robotics lesson 24: Line-follower programs · Set 29 · 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 keeps fixing its path (c) its wheels are square (d) it is dancing
  2. 2.⬛ Going too fast round a sharp bend, a line follower may … (a) lose the line (b) grow wheels (c) get heavier (d) turn into a car
  3. 3.⬛ 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, black–white, white–white, black–black. How many times does it 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 55 and the right sensor reads 10. What does it do?     (a) turn right (b) turn left (c) go forward
  5. 5.⬛ 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–black, black–white, black–white, white–white, white–white. How many times does it turn right?
  6. 6.⬛ Left sensor sees black, right sensor sees white. Which way should a line follower turn? (a) right (b) left (c) nowhere (d) backwards
  7. 7.⬛ 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
  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 black. What does it do?     (a) turn right (b) go forward (c) turn left
  9. 9.⬛ 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 left (b) turn right
  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 5 times (left–right): black–white, white–white, white–black, white–white, black–white. How many times does it 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, white–black, black–white, black–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): white–white, white–black, black–black, black–white. How many times does it turn left?
  13. 13.⬛ 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 65. What does it do?     (a) turn right (b) turn left (c) go forward
  14. 14.⬛ 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) 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 17. 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 20 and the right sensor reads 35. What does it do?     (a) go forward (b) turn left (c) turn right
  17. 17.⬛ 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–white, black–white. How many times does it turn left?
  18. 18.⬛ 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) go forward (b) turn left (c) 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 68. 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 6 times (left–right): black–black, black–white, black–white, white–white, white–black, black–black. How many times does it turn left?
  21. 21.⬛ 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
  22. 22.⬛ 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 40. What does it do?     (a) turn left (b) go forward (c) turn right
  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 6 times (left–right): white–black, black–white, black–black, white–white, white–black, white–black. 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 25 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 (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
  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 6 times (left–right): white–black, black–white, white–white, white–black, black–white, white–white. How many times does it turn right?
  27. 27.⬛ 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 right (b) turn left
  28. 28.⬛ 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–black, white–black, white–white, white–white, white–black. How many times does it turn right?
  29. 29.⬛ 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) go forward (b) turn right (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 4 times (left–right): black–white, white–black, white–black, black–black. How many times does it turn right?
  31. 31.⬛ 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 right (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 25 and the right sensor reads 65. What does it do?     (a) turn left (b) go forward (c) turn right
  33. 33.⬛ A one-sensor robot follows the edge of a line:
    if (light < 30) { turn right } else { turn left }
    The sensor reads 7. What does it do?     (a) turn left (b) 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): white–white, black–white, white–black, black–white, black–white. How many times does it turn left?
  35. 35.⬛ 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–black, white–white, black–black, white–black, white–white, black–white. How many times does it turn right?
  36. 36.⬛ 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–black, black–black, black–black, black–white, white–black. How many times does it 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 20 and the right sensor reads 80. What does it do?     (a) go forward (b) turn right (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 }
    It checks its sensors 6 times (left–right): black–white, white–black, white–black, white–black, black–black, black–black. How many times does it turn left?
  39. 39.⬛ 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) go forward (c) turn left
  40. 40.⬛ 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 25. What does it do?     (a) go forward (b) turn right (c) turn left

Answer key

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

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