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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 354 · 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 turning knob an input or an output for a microcontroller? (a) output (b) input
  2. 2.True or false: “many values in a range” is a digital signal. (a) True (b) False
  3. 3.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 1.5 V (d) 5 V
  4. 4.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  5. 5.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  7. 7.📶 How many states can a digital pin have? (a) a thousand (b) one (c) ten (d) two
  8. 8.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  9. 9.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.📶 Digital or analog: the room temperature? (a) analog (b) digital
  11. 11.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  12. 12.Which of these is an output? (a) a keypad (b) a turning knob (c) a temperature sensor (d) an LED
  13. 13.💡 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
  14. 14.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) a motor (d) a temperature sensor
  15. 15.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  16. 16.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  17. 17.🔍 Which is the odd one out? (a) a buzzer (b) a motor (c) a small display (d) a temperature sensor
  18. 18.🔍 Which is the odd one out? (a) a temperature sensor (b) a servo motor (c) a sound sensor (d) a keypad
  19. 19.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.Which of these is an output? (a) a light sensor (b) a sound sensor (c) a motion sensor (d) a small display
  22. 22.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  23. 23.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.Which of these is an output? (a) a motion sensor (b) a sound sensor (c) a speaker (d) a light sensor
  25. 25.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  26. 26.Which of these is an input? (a) a buzzer (b) a push button (c) a speaker (d) a water pump
  27. 27.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  28. 28.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  29. 29.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  30. 30.📶 Digital or analog: many values in a range? (a) analog (b) digital
  31. 31.🔍 Which is the odd one out? (a) a water pump (b) a speaker (c) a push button (d) a motor
  32. 32.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  33. 33.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  37. 37.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  38. 38.True or false: “the room temperature” is an analog signal. (a) True (b) False
  39. 39.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  40. 40.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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