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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 533 · 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) 50 V (b) 230 V (c) 5 V (d) 0 V
  2. 2.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  3. 3.🔍 Which is the odd one out? (a) a light sensor (b) a small display (c) a buzzer (d) an LED
  4. 4.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  5. 5.Which of these is an output? (a) a turning knob (b) a water pump (c) a sound sensor (d) a motion sensor
  6. 6.Which of these is an output? (a) a light sensor (b) a motor (c) a push button (d) a turning knob
  7. 7.📶 How many states can a digital pin have? (a) ten (b) two (c) a thousand (d) one
  8. 8.💡 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) OFF (b) ON
  9. 9.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  10. 10.🔍 Which is the odd one out? (a) a motor (b) a speaker (c) a turning knob (d) a buzzer
  11. 11.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  12. 12.True or false: “the room temperature” is a digital signal. (a) True (b) False
  13. 13.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  15. 15.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  16. 16.Which of these is an output? (a) a temperature sensor (b) a turning knob (c) a push button (d) an LED
  17. 17.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 5 V (d) 1.5 V
  18. 18.🔍 Which is the odd one out? (a) a water pump (b) a light sensor (c) a sound 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 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.Which of these is an input? (a) an LED (b) a light sensor (c) a servo motor (d) a water pump
  21. 21.Which of these is an input? (a) a motor (b) a temperature sensor (c) a small display (d) an LED
  22. 22.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  23. 23.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  24. 24.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  26. 26.🔍 Which is the odd one out? (a) a buzzer (b) a small display (c) a keypad (d) a water pump
  27. 27.🔍 Which is the odd one out? (a) a buzzer (b) a sound sensor (c) a motion sensor (d) a turning knob
  28. 28.🔍 Which is the odd one out? (a) a small display (b) a turning knob (c) a light sensor (d) a sound sensor
  29. 29.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  30. 30.Which of these is an input? (a) a push button (b) a buzzer (c) a servo motor (d) a water pump
  31. 31.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  32. 32.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  33. 33.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  36. 36.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  37. 37.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  38. 38.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) an input (d) a resistor
  39. 39.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  40. 40.Which of these is an output? (a) a light sensor (b) a buzzer (c) a keypad (d) a motion sensor

Answer key

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

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