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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 885 · 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 that reads a push button is set as … (a) an output (b) a battery (c) a resistor (d) an input
  2. 2.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  3. 3.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  4. 4.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  5. 5.🔍 Which is the odd one out? (a) a water pump (b) a sound sensor (c) a turning knob (d) a keypad
  6. 6.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.🔍 Which is the odd one out? (a) a small display (b) a speaker (c) a temperature sensor (d) a motor
  8. 8.🔍 Which is the odd one out? (a) a temperature sensor (b) a sound sensor (c) a push button (d) a speaker
  9. 9.💡 An LED (with its resistor) is on pin 8. 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
  10. 10.Which of these is an output? (a) an LED (b) a motion sensor (c) a push button (d) a keypad
  11. 11.💡 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
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.🔍 Which is the odd one out? (a) a motion sensor (b) a buzzer (c) a servo motor (d) a motor
  13. 13.📶 Digital or analog: the room temperature? (a) analog (b) digital
  14. 14.Which of these is an input? (a) an LED (b) a buzzer (c) a motion sensor (d) a servo motor
  15. 15.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 0 V (d) 1.5 V
  16. 16.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 50 V (c) 230 V (d) 0 V
  17. 17.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  18. 18.Which of these is an output? (a) a buzzer (b) a light sensor (c) a motion sensor (d) a temperature sensor
  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 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  21. 21.🔍 Which is the odd one out? (a) a turning knob (b) a small display (c) a servo motor (d) a motor
  22. 22.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  23. 23.🔍 Which is the odd one out? (a) a buzzer (b) a motor (c) a servo motor (d) a keypad
  24. 24.📶 How many states can a digital pin have? (a) a thousand (b) one (c) ten (d) two
  25. 25.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  26. 26.🔍 Which is the odd one out? (a) a turning knob (b) a buzzer (c) a push button (d) a sound sensor
  27. 27.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  28. 28.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  30. 30.Which of these is an input? (a) an LED (b) a speaker (c) a sound sensor (d) a servo motor
  31. 31.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  32. 32.💡 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
  33. 33.Which of these is an output? (a) a push button (b) a turning knob (c) a light sensor (d) a servo motor
  34. 34.🔍 Which is the odd one out? (a) a turning knob (b) a motion sensor (c) a keypad (d) a small display
  35. 35.True or false: “the room temperature” is an analog signal. (a) True (b) False
  36. 36.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  38. 38.Which of these is an output? (a) a light sensor (b) a water pump (c) a sound sensor (d) a motion sensor
  39. 39.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.True or false: “many values in a range” is a digital signal. (a) True (b) False

Answer key

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

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