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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 527 · 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 motion sensor (b) an LED (c) a small display (d) a speaker
  2. 2.💡 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
  3. 3.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  4. 4.📶 Digital or analog: many values in a range? (a) digital (b) analog
  5. 5.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  6. 6.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  7. 7.Which of these is an input? (a) a small display (b) a servo motor (c) a motor (d) a temperature sensor
  8. 8.💡 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) OFF (b) ON
  9. 9.🔍 Which is the odd one out? (a) a speaker (b) a water pump (c) a motor (d) a turning knob
  10. 10.🔍 Which is the odd one out? (a) a buzzer (b) a light sensor (c) a turning knob (d) a keypad
  11. 11.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 230 V (d) 50 V
  12. 12.Which of these is an output? (a) a push button (b) a motion sensor (c) a speaker (d) a temperature sensor
  13. 13.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.Which of these is an input? (a) a motor (b) a push button (c) a speaker (d) a small display
  15. 15.🔍 Which is the odd one out? (a) a keypad (b) a push button (c) a motion sensor (d) a speaker
  16. 16.💡 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
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.True or false: “many values in a range” is an analog signal. (a) False (b) True
  18. 18.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  19. 19.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  20. 20.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  22. 22.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) one (d) two
  23. 23.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  24. 24.💡 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
  25. 25.🔍 Which is the odd one out? (a) a servo motor (b) a push button (c) a buzzer (d) a small display
  26. 26.🔍 Which is the odd one out? (a) a motor (b) a light sensor (c) a speaker (d) a buzzer
  27. 27.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  28. 28.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  29. 29.💡 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
  30. 30.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  31. 31.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  32. 32.Which of these is an input? (a) a motor (b) a buzzer (c) a light sensor (d) a servo motor
  33. 33.💡 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
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.Which of these is an output? (a) a sound sensor (b) a temperature sensor (c) a keypad (d) a small display
  36. 36.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  37. 37.Which of these is an output? (a) a turning knob (b) a motion sensor (c) a light sensor (d) a buzzer
  38. 38.Which of these is an output? (a) a motion sensor (b) an LED (c) a light sensor (d) a sound sensor
  39. 39.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  40. 40.🔍 Which is the odd one out? (a) a turning knob (b) a water pump (c) a push button (d) a temperature sensor

Answer key

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

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