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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 504 · 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.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  2. 2.📶 Digital or analog: the room temperature? (a) analog (b) digital
  3. 3.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  4. 4.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  5. 5.🔍 Which is the odd one out? (a) a turning knob (b) a buzzer (c) a motor (d) an LED
  6. 6.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  7. 7.Which of these is an output? (a) a temperature sensor (b) a motion sensor (c) a push button (d) a small display
  8. 8.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  9. 9.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 0 V (d) 1.5 V
  10. 10.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  11. 11.💡 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) ON (b) OFF
  12. 12.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.True or false: “many values in a range” is an analog signal. (a) False (b) True
  14. 14.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  15. 15.Which of these is an output? (a) a motion sensor (b) a push button (c) a buzzer (d) a keypad
  16. 16.💡 An LED (with its resistor) is on pin 7. 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
  17. 17.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  18. 18.💡 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
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  21. 21.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  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 HIGH
    set pin 8 LOW
    set pin 7 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 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 5 V (d) 0 V
  25. 25.🔍 Which is the odd one out? (a) a water pump (b) a sound sensor (c) a speaker (d) an LED
  26. 26.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  27. 27.💡 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 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  29. 29.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a temperature sensor (d) a push button
  30. 30.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.🔍 Which is the odd one out? (a) a push button (b) a speaker (c) an LED (d) a small display
  32. 32.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  33. 33.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  34. 34.Which of these is an input? (a) a motor (b) a speaker (c) a buzzer (d) a push button
  35. 35.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  36. 36.🔍 Which is the odd one out? (a) a keypad (b) a light sensor (c) a turning knob (d) a buzzer
  37. 37.💡 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 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.💡 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 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  40. 40.Which of these is an input? (a) a servo motor (b) a light sensor (c) a motor (d) a water pump

Answer key

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

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