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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 814 · 40 questions
TalentJR

Remember (Read in, drive out): Inputs: buttons, knobs, sensors. Outputs: LEDs, buzzers, motors, displays. Digital: HIGH (≈ 5 V) or LOW (0 V) only. Analog: any value in a range. Trace the program: only the LED’s own pin matters, and its last command decides ON or OFF.

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  1. 1.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  4. 4.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  5. 5.🔍 Which is the odd one out? (a) a motion sensor (b) a speaker (c) a small display (d) an LED
  6. 6.Which of these is an output? (a) a speaker (b) a turning knob (c) a keypad (d) a push button
  7. 7.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) a sound sensor (d) a buzzer
  8. 8.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  9. 9.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  10. 10.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  11. 11.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.Which of these is an output? (a) a servo motor (b) a light sensor (c) a temperature sensor (d) a sound sensor
  13. 13.Which of these is an input? (a) a water pump (b) a speaker (c) a light sensor (d) a servo motor
  14. 14.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 9 V (d) 1.5 V
  16. 16.📶 Digital or analog: the room temperature? (a) digital (b) analog
  17. 17.📶 How many states can a digital pin have? (a) one (b) a thousand (c) ten (d) two
  18. 18.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  19. 19.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.Which of these is an input? (a) a water pump (b) a temperature sensor (c) a motor (d) an LED
  21. 21.True or false: “the room temperature” is an analog signal. (a) False (b) True
  22. 22.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  24. 24.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  25. 25.Which of these is an input? (a) a buzzer (b) a water pump (c) a push button (d) a speaker
  26. 26.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  27. 27.🔍 Which is the odd one out? (a) a turning knob (b) a motion sensor (c) a temperature sensor (d) a water pump
  28. 28.🔍 Which is the odd one out? (a) a temperature sensor (b) an LED (c) a sound sensor (d) a push button
  29. 29.🔍 Which is the odd one out? (a) a water pump (b) a temperature sensor (c) a servo motor (d) a small display
  30. 30.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 0 V (d) 230 V
  31. 31.🔍 Which is the odd one out? (a) a temperature sensor (b) a light sensor (c) a buzzer (d) a push button
  32. 32.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  33. 33.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  34. 34.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  37. 37.Which of these is an output? (a) a sound sensor (b) a push button (c) a motion sensor (d) a small display
  38. 38.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  39. 39.🔍 Which is the odd one out? (a) a speaker (b) a push button (c) a motion sensor (d) a sound sensor
  40. 40.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

  1. OFF
  2. ON
  3. True
  4. output
  5. a motion sensor
  6. a speaker
  7. a buzzer
  8. True
  9. analog
  10. input
  11. OFF
  12. a servo motor
  13. a light sensor
  14. ON
  15. 0 V
  16. analog
  17. two
  18. analog
  19. ON
  20. a temperature sensor
  21. True
  22. OFF
  23. False
  24. digital
  25. a push button
  26. digital
  27. a water pump
  28. an LED
  29. a temperature sensor
  30. 5 V
  31. a buzzer
  32. digital
  33. input
  34. OFF
  35. OFF
  36. output
  37. a small display
  38. analog
  39. a speaker
  40. OFF

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