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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 735 · 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.💡 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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.💡 An LED (with its resistor) is on pin 8. 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) ON (b) OFF
  3. 3.🔍 Which is the odd one out? (a) a push button (b) a temperature sensor (c) a sound sensor (d) a buzzer
  4. 4.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  5. 5.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) a motor (d) a push button
  6. 6.🔍 Which is the odd one out? (a) a water pump (b) a small display (c) a push button (d) an LED
  7. 7.🔍 Which is the odd one out? (a) a temperature sensor (b) a buzzer (c) a water pump (d) a servo motor
  8. 8.Which of these is an output? (a) a push button (b) a turning knob (c) a motor (d) a motion sensor
  9. 9.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  10. 10.Which of these is an output? (a) a push button (b) a temperature sensor (c) a turning knob (d) a buzzer
  11. 11.💡 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) OFF (b) ON
  12. 12.Which of these is an input? (a) a buzzer (b) a speaker (c) an LED (d) a light sensor
  13. 13.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.Which of these is an output? (a) a water pump (b) a motion sensor (c) a keypad (d) a turning knob
  15. 15.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  17. 17.💡 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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.Which of these is an input? (a) a servo motor (b) a push button (c) a small display (d) a speaker
  19. 19.📶 How many states can a digital pin have? (a) a thousand (b) one (c) two (d) ten
  20. 20.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  21. 21.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.💡 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
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  25. 25.🔍 Which is the odd one out? (a) a buzzer (b) a motion sensor (c) an LED (d) a servo motor
  26. 26.Which of these is an output? (a) a keypad (b) a speaker (c) a light sensor (d) a sound sensor
  27. 27.💡 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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.Which of these is an input? (a) a servo motor (b) a buzzer (c) a small display (d) a motion sensor
  29. 29.Which of these is an output? (a) a small display (b) a turning knob (c) a motion sensor (d) a temperature sensor
  30. 30.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  31. 31.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  32. 32.Which of these is an input? (a) a temperature sensor (b) an LED (c) a water pump (d) a servo motor
  33. 33.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  34. 34.🔍 Which is the odd one out? (a) a water pump (b) a light sensor (c) a small display (d) a motor
  35. 35.Which of these is an input? (a) a sound sensor (b) a motor (c) a speaker (d) a buzzer
  36. 36.💡 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 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  38. 38.Which of these is an output? (a) an LED (b) a light sensor (c) a sound sensor (d) a push button
  39. 39.💡 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
  40. 40.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 230 V (d) 0 V

Answer key

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

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