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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 422 · 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.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 230 V (d) 5 V
  2. 2.📶 Digital or analog: many values in a range? (a) analog (b) digital
  3. 3.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  4. 4.Which of these is an input? (a) a speaker (b) a small display (c) a keypad (d) a motor
  5. 5.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  6. 6.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  7. 7.Which of these is an input? (a) a speaker (b) an LED (c) a motion sensor (d) a servo motor
  8. 8.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) a turning knob (d) a speaker
  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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a servo motor (d) a speaker
  11. 11.🔍 Which is the odd one out? (a) a temperature sensor (b) a keypad (c) a motor (d) a push button
  12. 12.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  14. 14.Which of these is an output? (a) a motion sensor (b) a turning knob (c) a light sensor (d) a buzzer
  15. 15.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  16. 16.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.🔍 Which is the odd one out? (a) a speaker (b) a water pump (c) a turning knob (d) a servo motor
  18. 18.Which of these is an output? (a) a sound sensor (b) a light sensor (c) a motion sensor (d) a water pump
  19. 19.📶 Digital or analog: the room temperature? (a) analog (b) digital
  20. 20.💡 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 8 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.Which of these is an output? (a) an LED (b) a keypad (c) a light sensor (d) a motion sensor
  22. 22.True or false: “many values in a range” is an analog signal. (a) False (b) True
  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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.Which of these is an output? (a) a motion sensor (b) a speaker (c) a turning knob (d) a keypad
  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 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.📶 How many states can a digital pin have? (a) one (b) a thousand (c) ten (d) two
  27. 27.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  28. 28.💡 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) OFF (b) ON
  29. 29.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 5 V (d) 1.5 V
  30. 30.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  32. 32.🔍 Which is the odd one out? (a) a light sensor (b) a sound sensor (c) a small display (d) a motion sensor
  33. 33.True or false: “many values in a range” is a digital signal. (a) True (b) False
  34. 34.Which of these is an input? (a) a turning knob (b) an LED (c) a speaker (d) a small display
  35. 35.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  38. 38.🔍 Which is the odd one out? (a) a water pump (b) a motor (c) a speaker (d) a motion sensor
  39. 39.💡 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 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a resistor (d) a battery

Answer key

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

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