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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 464 · 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.Which of these is an input? (a) a motor (b) a small display (c) an LED (d) a sound sensor
  2. 2.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  3. 3.💡 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
  4. 4.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  5. 5.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.💡 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
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.🔍 Which is the odd one out? (a) an LED (b) a small display (c) a light sensor (d) a speaker
  8. 8.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.📶 Digital or analog: many values in a range? (a) analog (b) digital
  10. 10.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  11. 11.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  12. 12.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.🔍 Which is the odd one out? (a) a speaker (b) a servo motor (c) a temperature sensor (d) a water pump
  14. 14.🔍 Which is the odd one out? (a) a motion sensor (b) a push button (c) a motor (d) a turning knob
  15. 15.📶 Digital or analog: the room temperature? (a) analog (b) digital
  16. 16.🔍 Which is the odd one out? (a) an LED (b) a motion sensor (c) a push button (d) a light sensor
  17. 17.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  18. 18.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  19. 19.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    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
  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.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.💡 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
    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
  23. 23.Which of these is an output? (a) a turning knob (b) a sound sensor (c) an LED (d) a light sensor
  24. 24.🔍 Which is the odd one out? (a) a motor (b) a servo motor (c) a water pump (d) a keypad
  25. 25.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 230 V (d) 50 V
  26. 26.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  27. 27.🔍 Which is the odd one out? (a) a sound sensor (b) a water pump (c) a buzzer (d) an LED
  28. 28.📶 How many states can a digital pin have? (a) a thousand (b) one (c) two (d) ten
  29. 29.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.Which of these is an input? (a) a small display (b) a buzzer (c) a turning knob (d) a speaker
  32. 32.🔌 Is a keypad 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.Which of these is an input? (a) a speaker (b) a motor (c) a light sensor (d) a servo motor
  36. 36.Which of these is an input? (a) a motor (b) a servo motor (c) a motion sensor (d) a small display
  37. 37.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 9 V (d) 1.5 V
  38. 38.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.True or false: “a knob turned part way” is an analog signal. (a) False (b) True

Answer key

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

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