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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 817 · 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.🔍 Which is the odd one out? (a) a water pump (b) a temperature sensor (c) a motor (d) a buzzer
  2. 2.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  3. 3.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.🔍 Which is the odd one out? (a) a push button (b) a buzzer (c) a light sensor (d) a sound sensor
  6. 6.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  7. 7.True or false: “the room temperature” is an analog signal. (a) False (b) True
  8. 8.Which of these is an output? (a) a turning knob (b) a temperature sensor (c) a light sensor (d) a small display
  9. 9.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  13. 13.Which of these is an input? (a) a motor (b) a buzzer (c) a keypad (d) a speaker
  14. 14.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    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.🔍 Which is the odd one out? (a) a motor (b) a light sensor (c) a push button (d) a sound sensor
  16. 16.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  17. 17.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  18. 18.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 0 V (d) 5 V
  19. 19.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  22. 22.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  23. 23.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.📶 Digital or analog: many values in a range? (a) digital (b) analog
  25. 25.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  26. 26.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  27. 27.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  28. 28.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  29. 29.Which of these is an output? (a) a sound sensor (b) a push button (c) a buzzer (d) a light sensor
  30. 30.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.Which of these is an output? (a) a turning knob (b) a temperature sensor (c) a keypad (d) a motor
  35. 35.📶 A pin set LOW gives about … (a) 0 V (b) 9 V (c) 1.5 V (d) 5 V
  36. 36.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  37. 37.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) one (d) two
  39. 39.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  40. 40.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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