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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 926 · 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: “the room temperature” is a digital signal. (a) False (b) True
  2. 2.🔍 Which is the odd one out? (a) a motion sensor (b) a light sensor (c) a buzzer (d) a turning knob
  3. 3.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  4. 4.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 5 V (d) 0 V
  5. 5.Which of these is an input? (a) a sound sensor (b) a buzzer (c) a water pump (d) an LED
  6. 6.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  7. 7.Which of these is an output? (a) a servo motor (b) a motion sensor (c) a sound sensor (d) a push button
  8. 8.💡 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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  10. 10.🔍 Which is the odd one out? (a) a servo motor (b) a motion sensor (c) a speaker (d) a water pump
  11. 11.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  13. 13.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  14. 14.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  15. 15.Which of these is an output? (a) a temperature sensor (b) a buzzer (c) a light sensor (d) a motion sensor
  16. 16.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 1.5 V (d) 9 V
  17. 17.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  18. 18.Which of these is an input? (a) a motor (b) a water pump (c) a buzzer (d) a light sensor
  19. 19.📶 How many states can a digital pin have? (a) two (b) one (c) ten (d) a thousand
  20. 20.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.🔍 Which is the odd one out? (a) a motion sensor (b) a motor (c) a push button (d) a temperature sensor
  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 8 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.💡 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 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  25. 25.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  26. 26.Which of these is an input? (a) a small display (b) a motion sensor (c) a buzzer (d) a water pump
  27. 27.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.🔍 Which is the odd one out? (a) a push button (b) a sound sensor (c) a small display (d) a keypad
  29. 29.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  30. 30.Which of these is an output? (a) a speaker (b) a light sensor (c) a motion sensor (d) a temperature sensor
  31. 31.🔍 Which is the odd one out? (a) an LED (b) a light sensor (c) a servo motor (d) a buzzer
  32. 32.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  34. 34.🔍 Which is the odd one out? (a) a water pump (b) a small display (c) a motor (d) a sound sensor
  35. 35.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.Which of these is an input? (a) a motor (b) a speaker (c) an LED (d) a keypad
  37. 37.📶 Digital or analog: a tilt switch: on or off? (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 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.📶 Digital or analog: many values in a range? (a) analog (b) digital
  40. 40.📶 Digital or analog: the room temperature? (a) analog (b) digital

Answer key

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

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