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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 682 · 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 an LED an input or an output for a microcontroller? (a) input (b) output
  2. 2.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  3. 3.Which of these is an output? (a) a push button (b) a keypad (c) a speaker (d) a sound sensor
  4. 4.💡 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
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.🔍 Which is the odd one out? (a) a small display (b) a keypad (c) a motion sensor (d) a sound sensor
  6. 6.🔍 Which is the odd one out? (a) a buzzer (b) a push button (c) a sound sensor (d) a motion sensor
  7. 7.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  8. 8.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  9. 9.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  10. 10.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  11. 11.📶 Digital or analog: many values in a range? (a) digital (b) analog
  12. 12.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.🔍 Which is the odd one out? (a) a motion sensor (b) a sound sensor (c) a temperature sensor (d) an LED
  14. 14.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  15. 15.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.🔍 Which is the odd one out? (a) a speaker (b) an LED (c) a motor (d) a temperature sensor
  17. 17.🔍 Which is the odd one out? (a) a speaker (b) a push button (c) a keypad (d) a temperature sensor
  18. 18.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  20. 20.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.🔍 Which is the odd one out? (a) a buzzer (b) a water pump (c) a sound sensor (d) a speaker
  22. 22.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  23. 23.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  24. 24.Which of these is an output? (a) a push button (b) a keypad (c) an LED (d) a sound sensor
  25. 25.True or false: “the room temperature” is an analog signal. (a) True (b) False
  26. 26.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  28. 28.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  31. 31.Which of these is an output? (a) a push button (b) a sound sensor (c) a servo motor (d) a light sensor
  32. 32.🔍 Which is the odd one out? (a) a sound sensor (b) a motor (c) a push button (d) a keypad
  33. 33.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 5 V (d) 0 V
  34. 34.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 50 V (d) 5 V
  35. 35.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  36. 36.💡 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
    set pin 8 LOW
    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 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  39. 39.💡 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) ON (b) OFF
  40. 40.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True

Answer key

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

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