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Electronics Worksheet: Blink Programs and Delays

Electronics lesson 23: Blink programs and delays · Set 15 · 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.

NameDateTime takenScore ___ / 40
  1. 1.⏱️ loop forever { LED ON; wait 150 ms; LED OFF; wait 250 ms }
    How many times does the LED blink in 18 seconds?
  2. 2.⏱️ repeat 3 times { buzzer ON; wait 100 ms; buzzer OFF; wait 700 ms }
    How many milliseconds does this take in all?
  3. 3.⏱️ A program says “wait 500 ms”. How many seconds is that? =
  4. 4.⏱️ loop forever { LED ON; wait 300 ms; LED OFF; wait 900 ms }
    How many milliseconds does one blink (ON + OFF) take?
  5. 5.⏱️ loop forever { LED ON; wait 650 ms; LED OFF; wait 600 ms }
    How many milliseconds does one blink (ON + OFF) take?
  6. 6.⏱️ loop forever { LED ON; wait 350 ms; LED OFF; wait 100 ms }
    How many milliseconds does one blink (ON + OFF) take?
  7. 7.⏱️ loop forever { LED ON; wait 350 ms; LED OFF; wait 50 ms }
    How many milliseconds does one blink (ON + OFF) take?
  8. 8.⏱️ loop forever { LED ON; wait 150 ms; LED OFF; wait 50 ms }
    How many times does the LED blink in 7 seconds?
  9. 9.⏱️ repeat 9 times { buzzer ON; wait 400 ms; buzzer OFF; wait 500 ms }
    How many milliseconds does this take in all?
  10. 10.⏱️ How many milliseconds is a wait of 4.1 seconds?
  11. 11.⏱️ loop forever { LED ON; wait 50 ms; LED OFF; wait 450 ms }
    How many times does the LED blink in 4 seconds?
  12. 12.⏱️ What does “wait 500 ms” do? (a) turns the LED off (b) blinks 500 times (c) waits 500 seconds (d) pauses for half a second
  13. 13.⏱️ repeat 10 times { buzzer ON; wait 700 ms; buzzer OFF; wait 200 ms }
    How many milliseconds does this take in all?
  14. 14.⏱️ A program says “wait 6750 ms”. How many seconds is that? =
  15. 15.⏱️ repeat 5 times { buzzer ON; wait 600 ms; buzzer OFF; wait 1000 ms }
    How many milliseconds does this take in all?
  16. 16.⏱️ How many milliseconds is a wait of 0.2 seconds?
  17. 17.⏱️ How many milliseconds are in 1 second? (a) 1000 (b) 10 (c) 60 (d) 100
  18. 18.⏱️ A program says “wait 750 ms”. How many seconds is that? =
  19. 19.⏱️ loop forever { LED ON; wait 50 ms; LED OFF; wait 200 ms }
    How many times does the LED blink in 3 seconds?
  20. 20.⏱️ loop forever { LED ON; wait 150 ms; LED OFF; wait 50 ms }
    How many times does the LED blink in 1 second?
  21. 21.⏱️ repeat 8 times { buzzer ON; wait 100 ms; buzzer OFF; wait 200 ms }
    How many milliseconds does this take in all?
  22. 22.⏱️ loop forever { LED ON; wait 300 ms; LED OFF; wait 450 ms }
    How many milliseconds does one blink (ON + OFF) take?
  23. 23.⏱️ loop forever { LED ON; wait 400 ms; LED OFF; wait 1000 ms }
    How many milliseconds does one blink (ON + OFF) take?
  24. 24.⏱️ How many milliseconds is a wait of 0.8 seconds?
  25. 25.⏱️ repeat 8 times { buzzer ON; wait 900 ms; buzzer OFF; wait 600 ms }
    How many milliseconds does this take in all?
  26. 26.⏱️ loop forever { LED ON; wait 200 ms; LED OFF; wait 800 ms }
    How many milliseconds does one blink (ON + OFF) take?
  27. 27.⏱️ loop forever { LED ON; wait 300 ms; LED OFF; wait 700 ms }
    How many milliseconds does one blink (ON + OFF) take?
  28. 28.⏱️ repeat 7 times { buzzer ON; wait 300 ms; buzzer OFF; wait 100 ms }
    How many milliseconds does this take in all?
  29. 29.⏱️ A program says “wait 9000 ms”. How many seconds is that? =
  30. 30.⏱️ A program says “wait 1750 ms”. How many seconds is that? =
  31. 31.⏱️ loop forever { LED ON; wait 950 ms; LED OFF; wait 50 ms }
    How many times does the LED blink in 5 seconds?
  32. 32.⏱️ loop forever { LED ON; wait 350 ms; LED OFF; wait 50 ms }
    How many times does the LED blink in 10 seconds?
  33. 33.⏱️ loop forever { LED ON; wait 350 ms; LED OFF; wait 650 ms }
    How many times does the LED blink in 5 seconds?
  34. 34.⏱️ A program says “wait 8000 ms”. How many seconds is that? =
  35. 35.⏱️ A program says “wait 4250 ms”. How many seconds is that? =
  36. 36.⏱️ A program says “wait 7250 ms”. How many seconds is that? =
  37. 37.⏱️ loop forever { LED ON; wait 200 ms; LED OFF; wait 200 ms }
    How many times does the LED blink in 12 seconds?
  38. 38.⏱️ How many milliseconds is a wait of 3.7 seconds?
  39. 39.⏱️ loop forever { LED ON; wait 200 ms; LED OFF; wait 200 ms }
    How many times does the LED blink in 20 seconds?
  40. 40.⏱️ repeat 3 times { buzzer ON; wait 600 ms; buzzer OFF; wait 300 ms }
    How many milliseconds does this take in all?

Answer key

  1. 45
  2. 2400
  3. 0.5
  4. 1200
  5. 1250
  6. 450
  7. 400
  8. 35
  9. 8100
  10. 4100
  11. 8
  12. pauses for half a second
  13. 9000
  14. 6.75
  15. 8000
  16. 200
  17. 1000
  18. 0.75
  19. 12
  20. 5
  21. 2400
  22. 750
  23. 1400
  24. 800
  25. 12000
  26. 1000
  27. 1000
  28. 2800
  29. 9
  30. 1.75
  31. 5
  32. 25
  33. 5
  34. 8
  35. 4.25
  36. 7.25
  37. 30
  38. 3700
  39. 50
  40. 2700

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