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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 389 · 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.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  2. 2.📶 How many states can a digital pin have? (a) two (b) one (c) ten (d) a thousand
  3. 3.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  4. 4.Which of these is an output? (a) an LED (b) a keypad (c) a turning knob (d) a sound sensor
  5. 5.🔍 Which is the odd one out? (a) a small display (b) an LED (c) a light sensor (d) a water pump
  6. 6.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  7. 7.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  9. 9.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  10. 10.🔍 Which is the odd one out? (a) a buzzer (b) a speaker (c) a water pump (d) a push button
  11. 11.🔍 Which is the odd one out? (a) a push button (b) a sound sensor (c) a light sensor (d) a buzzer
  12. 12.Which of these is an output? (a) a light sensor (b) a motion sensor (c) a water pump (d) a keypad
  13. 13.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 9 V (d) 1.5 V
  15. 15.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.Which of these is an input? (a) a speaker (b) a water pump (c) a motion sensor (d) a buzzer
  18. 18.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  19. 19.Which of these is an output? (a) a speaker (b) a temperature sensor (c) a motion sensor (d) a push button
  20. 20.🔍 Which is the odd one out? (a) a buzzer (b) an LED (c) a small display (d) a motion sensor
  21. 21.💡 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
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.Which of these is an input? (a) a motor (b) a buzzer (c) a push button (d) an LED
  23. 23.🔍 Which is the odd one out? (a) a keypad (b) a light sensor (c) a sound sensor (d) a speaker
  24. 24.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  25. 25.Which of these is an output? (a) a turning knob (b) a motion sensor (c) a keypad (d) a servo motor
  26. 26.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  27. 27.🔍 Which is the odd one out? (a) a turning knob (b) a keypad (c) a small display (d) a light sensor
  28. 28.🔍 Which is the odd one out? (a) a water pump (b) a turning knob (c) a light sensor (d) a sound sensor
  29. 29.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 5 V (d) 230 V
  30. 30.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  31. 31.Which of these is an output? (a) a motion sensor (b) a temperature sensor (c) a turning knob (d) a motor
  32. 32.💡 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  34. 34.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  35. 35.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  36. 36.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  38. 38.💡 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
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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