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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 206 · 40 questions
TalentJR

Robot tip (Half the echo path): Distance (cm) = 17 × echo time (ms), because 34 cm per ms ÷ 2 for there and back. Echo time (ms) = distance × 2 ÷ 34. Distance after driving = distance now − speed × time.

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  1. 1.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  2. 2.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  3. 3.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  4. 4.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  5. 5.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  6. 6.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  7. 7.📡 A robot is 150 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 18 seconds (in cm)?
  8. 8.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  9. 9.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a snail (c) a cow (d) a bat
  10. 10.📡 A robot is 110 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 8 seconds (in cm)?
  11. 11.📡 A robot is 210 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 15 seconds (in cm)?
  12. 12.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  13. 13.📡 A robot is 290 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 6 seconds (in cm)?
  14. 14.📡 A robot is 200 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 6 seconds (in cm)?
  15. 15.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  16. 16.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  17. 17.📡 A robot is 210 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 7 seconds (in cm)?
  18. 18.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) bright light (d) radio music
  19. 19.📡 Why do we halve the echo’s total path? (a) sound is slow (b) it goes there and back (c) to make it smaller (d) the sensor is half
  20. 20.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  21. 21.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 34 cm (c) 3 cm (d) 340 cm
  22. 22.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a metal door (c) a flat wall (d) a soft foam cushion
  23. 23.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  24. 24.📡 A robot is 290 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 8 seconds (in cm)?
  25. 25.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  26. 26.📡 A robot is 180 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 1 second (in cm)?
  27. 27.📡 A robot is 300 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 35 seconds (in cm)?
  28. 28.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  29. 29.📡 A robot is 180 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 14 seconds (in cm)?
  30. 30.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  31. 31.📡 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  32. 32.📡 A robot is 250 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 21 seconds (in cm)?
  33. 33.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  34. 34.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  35. 35.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  36. 36.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  37. 37.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  38. 38.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  39. 39.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  40. 40.📡 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

Answer key

  1. 238
  2. No
  3. 68
  4. 13
  5. Yes
  6. 3
  7. 60
  8. Yes
  9. a bat
  10. 70
  11. 60
  12. Yes
  13. 200
  14. 110
  15. 340
  16. 1
  17. 175
  18. sound too high to hear
  19. it goes there and back
  20. No
  21. 34 cm
  22. a soft foam cushion
  23. No
  24. 170
  25. No
  26. 165
  27. 125
  28. 20
  29. 40
  30. 85
  31. 12
  32. 40
  33. No
  34. 4
  35. 8
  36. 272
  37. 15
  38. 17
  39. 7
  40. 14

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