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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 864 · 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.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 0 V (d) 50 V
  2. 2.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  3. 3.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) one (d) two
  4. 4.🔍 Which is the odd one out? (a) a motion sensor (b) a small display (c) a push button (d) a sound sensor
  5. 5.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  6. 6.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 9 V (d) 1.5 V
  7. 7.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  8. 8.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.📶 Digital or analog: the room temperature? (a) digital (b) analog
  10. 10.Which of these is an output? (a) a keypad (b) a push button (c) a light sensor (d) an LED
  11. 11.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  12. 12.Which of these is an output? (a) a keypad (b) a temperature sensor (c) a motion sensor (d) a small display
  13. 13.Which of these is an output? (a) a light sensor (b) a push button (c) a water pump (d) a temperature sensor
  14. 14.💡 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
    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
  15. 15.💡 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 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.🔍 Which is the odd one out? (a) a temperature sensor (b) an LED (c) a motor (d) a water pump
  17. 17.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.Which of these is an output? (a) a buzzer (b) a sound sensor (c) a light sensor (d) a push button
  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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  21. 21.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  22. 22.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  23. 23.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.🔍 Which is the odd one out? (a) a motor (b) an LED (c) a motion sensor (d) a buzzer
  26. 26.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  27. 27.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  28. 28.💡 An LED (with its resistor) is on pin 7. 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) OFF (b) ON
  29. 29.🔍 Which is the odd one out? (a) a push button (b) a temperature sensor (c) a light sensor (d) a motor
  30. 30.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  31. 31.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.🔍 Which is the odd one out? (a) a speaker (b) a buzzer (c) a keypad (d) a small display
  33. 33.📶 Digital or analog: many values in a range? (a) analog (b) digital
  34. 34.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  35. 35.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) a buzzer (d) a temperature sensor
  37. 37.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  38. 38.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  39. 39.Which of these is an input? (a) an LED (b) a speaker (c) a water pump (d) a light sensor
  40. 40.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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