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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 155 · 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) True (b) False
  2. 2.🔍 Which is the odd one out? (a) a keypad (b) a temperature sensor (c) a light sensor (d) a servo motor
  3. 3.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  4. 4.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 50 V (d) 230 V
  5. 5.True or false: “the room temperature” is an analog signal. (a) True (b) False
  6. 6.Which of these is an input? (a) a buzzer (b) a light sensor (c) a small display (d) an LED
  7. 7.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  8. 8.Which of these is an input? (a) a small display (b) a water pump (c) a buzzer (d) a sound sensor
  9. 9.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  10. 10.📶 How many states can a digital pin have? (a) two (b) one (c) ten (d) a thousand
  11. 11.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  12. 12.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  13. 13.🔍 Which is the odd one out? (a) a small display (b) a push button (c) a motion sensor (d) a sound sensor
  14. 14.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 0 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 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.💡 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
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.💡 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
  18. 18.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  19. 19.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  20. 20.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  24. 24.💡 An LED (with its resistor) is on pin 8. 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
  25. 25.🔍 Which is the odd one out? (a) a speaker (b) a buzzer (c) a water pump (d) a light sensor
  26. 26.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  27. 27.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  28. 28.🔍 Which is the odd one out? (a) a water pump (b) a buzzer (c) an LED (d) a temperature sensor
  29. 29.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    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
  30. 30.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  32. 32.🔍 Which is the odd one out? (a) a motion sensor (b) a sound sensor (c) an LED (d) a keypad
  33. 33.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    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
  34. 34.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  35. 35.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  36. 36.🔍 Which is the odd one out? (a) a motor (b) a buzzer (c) a speaker (d) a sound sensor
  37. 37.Which of these is an output? (a) a sound sensor (b) a light sensor (c) a push button (d) a buzzer
  38. 38.Which of these is an input? (a) a water pump (b) a keypad (c) an LED (d) a small display
  39. 39.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  40. 40.Which of these is an output? (a) a temperature sensor (b) a water pump (c) a light sensor (d) a push button

Answer key

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

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