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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 488 · 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) analog (b) digital
  2. 2.Which of these is an output? (a) a sound sensor (b) a keypad (c) a push button (d) a motor
  3. 3.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  4. 4.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  5. 5.Which of these is an input? (a) a water pump (b) a temperature sensor (c) a small display (d) a servo motor
  6. 6.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  7. 7.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  8. 8.Which of these is an input? (a) a speaker (b) a motor (c) an LED (d) a motion sensor
  9. 9.Which of these is an output? (a) a sound sensor (b) a push button (c) a light sensor (d) a water pump
  10. 10.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.🔍 Which is the odd one out? (a) a sound sensor (b) a push button (c) a keypad (d) a speaker
  12. 12.💡 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 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.Which of these is an input? (a) a buzzer (b) a sound sensor (c) a motor (d) an LED
  14. 14.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  16. 16.Which of these is an input? (a) a servo motor (b) a push button (c) a buzzer (d) an LED
  17. 17.💡 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) OFF (b) ON
  18. 18.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.Which of these is an output? (a) a push button (b) a speaker (c) a keypad (d) a sound sensor
  20. 20.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  21. 21.📶 How many states can a digital pin have? (a) ten (b) two (c) one (d) a thousand
  22. 22.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  23. 23.Which of these is an output? (a) a turning knob (b) a keypad (c) a push button (d) a buzzer
  24. 24.Which of these is an input? (a) a water pump (b) a turning knob (c) a buzzer (d) a small display
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  27. 27.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  28. 28.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  29. 29.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  30. 30.🔍 Which is the odd one out? (a) a push button (b) a sound sensor (c) a temperature sensor (d) a water pump
  31. 31.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  32. 32.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  33. 33.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  34. 34.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  35. 35.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  36. 36.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.💡 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 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    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) OFF (b) ON
  39. 39.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.True or false: “a knob turned part way” is a digital signal. (a) True (b) False

Answer key

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

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