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Electronics Worksheet: Blink Programs and Delays

Electronics lesson 23: Blink programs and delays · Set 950 · 40 questions
TalentJR

Remember (ON + OFF = one blink): 1 second = 1000 ms. One blink = ON wait + OFF wait. Blinks = total time in ms ÷ one blink; repeat n times takes n × one round.

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  1. 1.⏱️ loop forever { LED ON; wait 150 ms; LED OFF; wait 350 ms }
    How many times does the LED blink in 1 second?
  2. 2.⏱️ What does “wait 500 ms” do? (a) blinks 500 times (b) turns the LED off (c) pauses for half a second (d) waits 500 seconds
  3. 3.⏱️ loop forever { LED ON; wait 1250 ms; LED OFF; wait 750 ms }
    How many times does the LED blink in 18 seconds?
  4. 4.⏱️ A program says “wait 3000 ms”. How many seconds is that? =
  5. 5.⏱️ repeat 3 times { buzzer ON; wait 800 ms; buzzer OFF; wait 100 ms }
    How many milliseconds does this take in all?
  6. 6.⏱️ repeat 9 times { buzzer ON; wait 300 ms; buzzer OFF; wait 500 ms }
    How many milliseconds does this take in all?
  7. 7.⏱️ loop forever { LED ON; wait 550 ms; LED OFF; wait 750 ms }
    How many milliseconds does one blink (ON + OFF) take?
  8. 8.⏱️ loop forever { LED ON; wait 250 ms; LED OFF; wait 150 ms }
    How many times does the LED blink in 14 seconds?
  9. 9.⏱️ loop forever { LED ON; wait 750 ms; LED OFF; wait 300 ms }
    How many milliseconds does one blink (ON + OFF) take?
  10. 10.⏱️ repeat 3 times { buzzer ON; wait 100 ms; buzzer OFF; wait 400 ms }
    How many milliseconds does this take in all?
  11. 11.⏱️ repeat 8 times { buzzer ON; wait 600 ms; buzzer OFF; wait 800 ms }
    How many milliseconds does this take in all?
  12. 12.⏱️ repeat 6 times { buzzer ON; wait 700 ms; buzzer OFF; wait 200 ms }
    How many milliseconds does this take in all?
  13. 13.⏱️ repeat 7 times { buzzer ON; wait 800 ms; buzzer OFF; wait 400 ms }
    How many milliseconds does this take in all?
  14. 14.⏱️ loop forever { LED ON; wait 150 ms; LED OFF; wait 50 ms }
    How many times does the LED blink in 5 seconds?
  15. 15.⏱️ A program says “wait 4750 ms”. How many seconds is that? =
  16. 16.⏱️ loop forever { LED ON; wait 1250 ms; LED OFF; wait 750 ms }
    How many times does the LED blink in 4 seconds?
  17. 17.⏱️ loop forever { LED ON; wait 50 ms; LED OFF; wait 250 ms }
    How many milliseconds does one blink (ON + OFF) take?
  18. 18.⏱️ A program says “wait 250 ms”. How many seconds is that? =
  19. 19.⏱️ How many milliseconds are in 1 second? (a) 10 (b) 60 (c) 1000 (d) 100
  20. 20.⏱️ How many milliseconds is a wait of 0.7 seconds?
  21. 21.⏱️ How many milliseconds is a wait of 3.8 seconds?
  22. 22.⏱️ loop forever { LED ON; wait 50 ms; LED OFF; wait 150 ms }
    How many times does the LED blink in 9 seconds?
  23. 23.⏱️ loop forever { LED ON; wait 400 ms; LED OFF; wait 50 ms }
    How many milliseconds does one blink (ON + OFF) take?
  24. 24.⏱️ How many milliseconds is a wait of 2 seconds?
  25. 25.⏱️ loop forever { LED ON; wait 500 ms; LED OFF; wait 650 ms }
    How many milliseconds does one blink (ON + OFF) take?
  26. 26.⏱️ A program says “wait 6750 ms”. How many seconds is that? =
  27. 27.⏱️ loop forever { LED ON; wait 150 ms; LED OFF; wait 700 ms }
    How many milliseconds does one blink (ON + OFF) take?
  28. 28.⏱️ loop forever { LED ON; wait 50 ms; LED OFF; wait 150 ms }
    How many times does the LED blink in 3 seconds?
  29. 29.⏱️ repeat 5 times { buzzer ON; wait 300 ms; buzzer OFF; wait 100 ms }
    How many milliseconds does this take in all?
  30. 30.⏱️ A program says “wait 8500 ms”. How many seconds is that? =
  31. 31.⏱️ loop forever { LED ON; wait 200 ms; LED OFF; wait 800 ms }
    How many times does the LED blink in 9 seconds?
  32. 32.⏱️ loop forever { LED ON; wait 50 ms; LED OFF; wait 150 ms }
    How many times does the LED blink in 8 seconds?
  33. 33.⏱️ repeat 3 times { buzzer ON; wait 800 ms; buzzer OFF; wait 600 ms }
    How many milliseconds does this take in all?
  34. 34.⏱️ A program says “wait 3500 ms”. How many seconds is that? =
  35. 35.⏱️ How many milliseconds is a wait of 4.1 seconds?
  36. 36.⏱️ loop forever { LED ON; wait 50 ms; LED OFF; wait 750 ms }
    How many milliseconds does one blink (ON + OFF) take?
  37. 37.⏱️ loop forever { LED ON; wait 1600 ms; LED OFF; wait 400 ms }
    How many times does the LED blink in 10 seconds?
  38. 38.⏱️ loop forever { LED ON; wait 200 ms; LED OFF; wait 700 ms }
    How many milliseconds does one blink (ON + OFF) take?
  39. 39.⏱️ loop forever { LED ON; wait 300 ms; LED OFF; wait 650 ms }
    How many milliseconds does one blink (ON + OFF) take?
  40. 40.⏱️ loop forever { LED ON; wait 1850 ms; LED OFF; wait 150 ms }
    How many times does the LED blink in 8 seconds?

Answer key

  1. 2
  2. pauses for half a second
  3. 9
  4. 3
  5. 2700
  6. 7200
  7. 1300
  8. 35
  9. 1050
  10. 1500
  11. 11200
  12. 5400
  13. 8400
  14. 25
  15. 4.75
  16. 2
  17. 300
  18. 0.25
  19. 1000
  20. 700
  21. 3800
  22. 45
  23. 450
  24. 2000
  25. 1150
  26. 6.75
  27. 850
  28. 15
  29. 2000
  30. 8.5
  31. 9
  32. 40
  33. 4200
  34. 3.5
  35. 4100
  36. 800
  37. 5
  38. 900
  39. 950
  40. 4

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