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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 689 · 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 13 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 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  3. 3.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a soft foam cushion (c) a metal door (d) a flat wall
  4. 4.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  5. 5.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 1 km (c) 340 cm (d) 34 cm
  6. 6.📡 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 13 seconds (in cm)?
  7. 7.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  8. 8.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  9. 9.📡 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) No (b) Yes
  10. 10.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) sound is slow (c) the sensor is half (d) to make it smaller
  11. 11.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  12. 12.📡 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  13. 13.📡 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?
  14. 14.📡 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)?
  15. 15.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) water drops (d) sound too high to hear
  16. 16.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  17. 17.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  18. 18.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  19. 19.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  20. 20.📡 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 9 seconds (in cm)?
  21. 21.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  22. 22.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  23. 23.📡 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?
  24. 24.📡 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)?
  25. 25.📡 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
  26. 26.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a snail (c) a bat (d) a cow
  27. 27.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  28. 28.📡 A robot is 240 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 1 second (in cm)?
  29. 29.📡 A robot is 160 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 28 seconds (in cm)?
  30. 30.📡 A robot is 130 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 4 seconds (in cm)?
  31. 31.📡 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)?
  32. 32.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  33. 33.📡 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?
  34. 34.📡 A robot is 260 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 22 seconds (in cm)?
  35. 35.📡 A robot is 260 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 9 seconds (in cm)?
  36. 36.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  37. 37.📡 A robot is 240 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 22 seconds (in cm)?
  38. 38.📡 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?
  39. 39.📡 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)?
  40. 40.📡 A robot is 300 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 4 seconds (in cm)?

Answer key

  1. 221
  2. No
  3. a soft foam cushion
  4. 153
  5. 34 cm
  6. 50
  7. 2
  8. 170
  9. Yes
  10. it goes there and back
  11. 102
  12. 17
  13. 20
  14. 68
  15. sound too high to hear
  16. Yes
  17. No
  18. 323
  19. 51
  20. 105
  21. 9
  22. Yes
  23. 12
  24. 238
  25. Yes
  26. a bat
  27. 187
  28. 220
  29. 20
  30. 90
  31. 85
  32. No
  33. 1
  34. 40
  35. 80
  36. No
  37. 20
  38. 7
  39. 340
  40. 220

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