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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 877 · 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.Which of these is an output? (a) a sound sensor (b) a motor (c) a motion sensor (d) a push button
  3. 3.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  4. 4.🔍 Which is the odd one out? (a) a temperature sensor (b) a light sensor (c) a turning knob (d) an LED
  5. 5.🔍 Which is the odd one out? (a) a light sensor (b) a turning knob (c) a push button (d) a speaker
  6. 6.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  7. 7.💡 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
  8. 8.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  9. 9.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  10. 10.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  11. 11.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.💡 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) ON (b) OFF
  14. 14.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  15. 15.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 0 V (d) 5 V
  16. 16.💡 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
  17. 17.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  18. 18.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  19. 19.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  20. 20.🔍 Which is the odd one out? (a) a push button (b) a motion sensor (c) a sound sensor (d) a buzzer
  21. 21.Which of these is an input? (a) a keypad (b) a water pump (c) a buzzer (d) a speaker
  22. 22.Which of these is an output? (a) a push button (b) a motion sensor (c) a water pump (d) a sound sensor
  23. 23.💡 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
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.🔍 Which is the odd one out? (a) an LED (b) a buzzer (c) a push button (d) a servo motor
  27. 27.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  28. 28.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  29. 29.Which of these is an input? (a) a motor (b) a small display (c) a push button (d) an LED
  30. 30.🔍 Which is the odd one out? (a) a small display (b) a servo motor (c) a buzzer (d) a light sensor
  31. 31.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  33. 33.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 0 V (d) 5 V
  36. 36.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  37. 37.📶 How many states can a digital pin have? (a) one (b) a thousand (c) two (d) ten
  38. 38.Which of these is an output? (a) a turning knob (b) a small display (c) a keypad (d) a light sensor
  39. 39.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  40. 40.🔍 Which is the odd one out? (a) a sound sensor (b) a temperature sensor (c) a push button (d) a small display

Answer key

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

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