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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 377 · 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.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  2. 2.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  3. 3.📶 Digital or analog: the room temperature? (a) analog (b) digital
  4. 4.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.True or false: “the room temperature” is an analog signal. (a) False (b) True
  6. 6.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  7. 7.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  8. 8.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  9. 9.Which of these is an output? (a) a turning knob (b) a light sensor (c) an LED (d) a temperature sensor
  10. 10.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  11. 11.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  12. 12.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  13. 13.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 0 V (d) 50 V
  14. 14.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  15. 15.Which of these is an output? (a) a sound sensor (b) a buzzer (c) a turning knob (d) a push button
  16. 16.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  17. 17.💡 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) OFF (b) ON
  18. 18.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.Which of these is an input? (a) a buzzer (b) a speaker (c) a servo motor (d) a light sensor
  20. 20.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.🔍 Which is the odd one out? (a) a motion sensor (b) a light sensor (c) a speaker (d) a push button
  22. 22.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  23. 23.Which of these is an output? (a) a temperature sensor (b) a light sensor (c) a water pump (d) a turning knob
  24. 24.💡 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
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  26. 26.💡 An LED (with its resistor) is on pin 7. 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
  27. 27.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  28. 28.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 9 V (d) 0 V
  30. 30.Which of these is an output? (a) a motion sensor (b) a push button (c) a small display (d) a temperature sensor
  31. 31.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) a sound sensor (d) an LED
  32. 32.🔍 Which is the odd one out? (a) an LED (b) a small display (c) a water pump (d) a push button
  33. 33.🔍 Which is the odd one out? (a) a keypad (b) a push button (c) a servo motor (d) a sound sensor
  34. 34.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.True or false: “the room temperature” is a digital 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.💡 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 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  39. 39.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  40. 40.Which of these is an output? (a) a motion sensor (b) a sound sensor (c) a speaker (d) a light sensor

Answer key

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

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