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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 359 · 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 of these is an input? (a) a water pump (b) a turning knob (c) a small display (d) a speaker
  2. 2.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 230 V (d) 5 V
  3. 3.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  4. 4.📶 How many states can a digital pin have? (a) ten (b) two (c) a thousand (d) one
  5. 5.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  6. 6.💡 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
  7. 7.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) a resistor (d) an output
  8. 8.Which of these is an input? (a) an LED (b) a small display (c) a sound sensor (d) a speaker
  9. 9.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  10. 10.🔍 Which is the odd one out? (a) a motion sensor (b) a water pump (c) a keypad (d) a push button
  11. 11.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  12. 12.🔍 Which is the odd one out? (a) a push button (b) a motion sensor (c) a motor (d) a light sensor
  13. 13.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  14. 14.🔍 Which is the odd one out? (a) a push button (b) a servo motor (c) a motion sensor (d) a keypad
  15. 15.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  16. 16.🔍 Which is the odd one out? (a) a water pump (b) a temperature sensor (c) a buzzer (d) a motor
  17. 17.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  18. 18.Which of these is an output? (a) a buzzer (b) a temperature 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.Which of these is an input? (a) a speaker (b) a motor (c) a motion sensor (d) a buzzer
  21. 21.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  22. 22.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  23. 23.True or false: “the room temperature” is an analog signal. (a) True (b) False
  24. 24.💡 An LED (with its resistor) is on pin 8. 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
  25. 25.🔍 Which is the odd one out? (a) a keypad (b) a motor (c) a speaker (d) an LED
  26. 26.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  27. 27.Which of these is an input? (a) a speaker (b) a buzzer (c) a push button (d) a small display
  28. 28.🔍 Which is the odd one out? (a) a turning knob (b) a small display (c) a light sensor (d) a push button
  29. 29.True or false: “many values in a range” is a digital signal. (a) True (b) False
  30. 30.Which of these is an input? (a) an LED (b) a small display (c) a light sensor (d) a water pump
  31. 31.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  32. 32.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.Which of these is an output? (a) a sound sensor (b) a light sensor (c) an LED (d) a push button
  34. 34.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  35. 35.🔍 Which is the odd one out? (a) a speaker (b) a sound sensor (c) a push button (d) a light sensor
  36. 36.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  37. 37.True or false: “the room temperature” is a digital signal. (a) False (b) True
  38. 38.Which of these is an output? (a) a push button (b) a light sensor (c) a keypad (d) a motor
  39. 39.Which of these is an input? (a) a motor (b) a servo motor (c) an LED (d) a keypad
  40. 40.💡 An LED (with its resistor) is on pin 8. 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

Answer key

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

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