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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 566 · 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 small display (b) a buzzer (c) a turning knob (d) an LED
  2. 2.💡 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
  3. 3.💡 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
  4. 4.True or false: “the room temperature” is an analog signal. (a) False (b) True
  5. 5.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  6. 6.🔍 Which is the odd one out? (a) a temperature sensor (b) a push button (c) a turning knob (d) a water pump
  7. 7.Which of these is an output? (a) a motion sensor (b) a keypad (c) a sound sensor (d) a water pump
  8. 8.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  9. 9.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) a speaker (d) a turning knob
  11. 11.Which of these is an input? (a) an LED (b) a water pump (c) a buzzer (d) a sound sensor
  12. 12.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  13. 13.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  14. 14.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.Which of these is an output? (a) a temperature sensor (b) a light sensor (c) a push button (d) a buzzer
  16. 16.🔍 Which is the odd one out? (a) a motion sensor (b) a motor (c) a turning knob (d) a temperature sensor
  17. 17.💡 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.🔍 Which is the odd one out? (a) a temperature sensor (b) a buzzer (c) a small display (d) an LED
  19. 19.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  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 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.Which of these is an input? (a) a servo motor (b) a speaker (c) a motion sensor (d) a water pump
  22. 22.🔌 Is an LED 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 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  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 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
  27. 27.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  28. 28.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  31. 31.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    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
  32. 32.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 5 V (d) 230 V
  33. 33.Which of these is an output? (a) a keypad (b) a speaker (c) a light sensor (d) a sound sensor
  34. 34.💡 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
  35. 35.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) two (d) one
  36. 36.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.💡 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
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔍 Which is the odd one out? (a) an LED (b) a speaker (c) a motion sensor (d) a small display
  40. 40.📶 Digital or analog: the room temperature? (a) digital (b) analog

Answer key

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

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