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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 855 · 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.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 5 V (d) 1.5 V
  2. 2.Which of these is an input? (a) a small display (b) a servo motor (c) a push button (d) a water pump
  3. 3.📶 Digital or analog: the room temperature? (a) digital (b) analog
  4. 4.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  5. 5.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  6. 6.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  7. 7.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  8. 8.🔍 Which is the odd one out? (a) a keypad (b) a temperature sensor (c) a push button (d) a servo motor
  9. 9.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  10. 10.💡 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
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  12. 12.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.🔍 Which is the odd one out? (a) a sound sensor (b) a keypad (c) a temperature sensor (d) a speaker
  14. 14.📶 How many states can a digital pin have? (a) two (b) a thousand (c) ten (d) one
  15. 15.💡 An LED (with its resistor) is on pin 8. 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
  16. 16.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  17. 17.Which of these is an input? (a) a motion sensor (b) a small display (c) a motor (d) a buzzer
  18. 18.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  19. 19.💡 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
  20. 20.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  21. 21.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.🔍 Which is the odd one out? (a) a push button (b) a buzzer (c) a water pump (d) a motor
  24. 24.🔍 Which is the odd one out? (a) a servo motor (b) a buzzer (c) a motor (d) a light sensor
  25. 25.🔍 Which is the odd one out? (a) a motor (b) a keypad (c) a motion sensor (d) a turning knob
  26. 26.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  27. 27.Which of these is an output? (a) a servo motor (b) a light sensor (c) a motion sensor (d) a push button
  28. 28.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  29. 29.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  30. 30.Which of these is an output? (a) a sound sensor (b) a motor (c) a motion sensor (d) a push button
  31. 31.💡 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 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.🔍 Which is the odd one out? (a) an LED (b) a buzzer (c) a temperature sensor (d) a speaker
  33. 33.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  34. 34.📶 Digital or analog: many values in a range? (a) digital (b) analog
  35. 35.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  36. 36.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 230 V (d) 5 V
  37. 37.Which of these is an output? (a) a light sensor (b) a keypad (c) a small display (d) a sound sensor
  38. 38.💡 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) OFF (b) ON
  39. 39.Which of these is an output? (a) a temperature sensor (b) a push button (c) a turning knob (d) an LED
  40. 40.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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