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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 233 · 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 motor an input or an output for a microcontroller? (a) input (b) output
  2. 2.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  3. 3.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  4. 4.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  5. 5.Which of these is an output? (a) a motion sensor (b) a temperature sensor (c) a sound sensor (d) a motor
  6. 6.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  7. 7.💡 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 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  9. 9.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.Which of these is an output? (a) a water pump (b) a sound sensor (c) a light sensor (d) a temperature sensor
  11. 11.Which of these is an input? (a) a light sensor (b) a buzzer (c) a water pump (d) a small display
  12. 12.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  13. 13.Which of these is an input? (a) a motor (b) a buzzer (c) a water pump (d) a turning knob
  14. 14.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  15. 15.🔍 Which is the odd one out? (a) an LED (b) a push button (c) a buzzer (d) a motor
  16. 16.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) an output (d) a resistor
  17. 17.🔍 Which is the odd one out? (a) an LED (b) a speaker (c) a motion sensor (d) a servo motor
  18. 18.Which of these is an output? (a) a motion sensor (b) a sound sensor (c) a buzzer (d) a keypad
  19. 19.Which of these is an output? (a) a sound sensor (b) a turning knob (c) a servo motor (d) a light sensor
  20. 20.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  21. 21.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  22. 22.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.Which of these is an input? (a) a sound sensor (b) a small display (c) a speaker (d) an LED
  24. 24.🔍 Which is the odd one out? (a) a water pump (b) a temperature sensor (c) a sound sensor (d) a motion sensor
  25. 25.Which of these is an output? (a) a light sensor (b) a motion sensor (c) a push button (d) a small display
  26. 26.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 0 V (d) 5 V
  27. 27.Which of these is an input? (a) a motion sensor (b) a small display (c) an LED (d) a speaker
  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 8. All pins start LOW. The program runs once:
    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) ON (b) OFF
  30. 30.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.Which of these is an output? (a) an LED (b) a temperature sensor (c) a motion sensor (d) a sound sensor
  32. 32.💡 An LED (with its resistor) is on pin 7. 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
  33. 33.🔍 Which is the odd one out? (a) a motor (b) a light sensor (c) a speaker (d) an LED
  34. 34.🔍 Which is the odd one out? (a) a speaker (b) a temperature sensor (c) a small display (d) a motor
  35. 35.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  36. 36.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.🔍 Which is the odd one out? (a) a small display (b) a turning knob (c) a sound sensor (d) a temperature sensor
  38. 38.💡 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
  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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.📶 Digital or analog: many values in a range? (a) digital (b) analog

Answer key

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

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