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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 820 · 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 turning knob an input or an output for a microcontroller? (a) output (b) input
  2. 2.Which of these is an output? (a) an LED (b) a motion sensor (c) a keypad (d) a light sensor
  3. 3.💡 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
  4. 4.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  5. 5.Which of these is an output? (a) a sound sensor (b) a keypad (c) a turning knob (d) a buzzer
  6. 6.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  7. 7.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  8. 8.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  9. 9.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.Which of these is an output? (a) a keypad (b) a sound sensor (c) a speaker (d) a temperature sensor
  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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.💡 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 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.💡 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
  14. 14.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) a motor (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 8 LOW
    set pin 8 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
  16. 16.🔍 Which is the odd one out? (a) a motor (b) a sound sensor (c) a light sensor (d) a motion sensor
  17. 17.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  18. 18.💡 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 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  20. 20.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  21. 21.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) an output (d) a resistor
  22. 22.💡 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) OFF (b) ON
  23. 23.Which of these is an output? (a) a keypad (b) a small display (c) a light sensor (d) a turning knob
  24. 24.🔍 Which is the odd one out? (a) a motor (b) a sound sensor (c) an LED (d) a servo motor
  25. 25.Which of these is an input? (a) a small display (b) a push button (c) an LED (d) a buzzer
  26. 26.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 0 V (d) 1.5 V
  27. 27.🔍 Which is the odd one out? (a) a buzzer (b) a keypad (c) a motion sensor (d) a turning knob
  28. 28.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 0 V (d) 5 V
  29. 29.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  30. 30.🔍 Which is the odd one out? (a) a motion sensor (b) a sound sensor (c) an LED (d) a temperature sensor
  31. 31.📶 How many states can a digital pin have? (a) two (b) one (c) a thousand (d) ten
  32. 32.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) a speaker (d) a light sensor
  33. 33.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  34. 34.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  35. 35.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  36. 36.📶 Digital or analog: the room temperature? (a) digital (b) analog
  37. 37.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  38. 38.💡 An LED (with its resistor) is on pin 7. 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) ON (b) OFF
  39. 39.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  40. 40.True or false: “a door: open or shut” is a digital signal. (a) True (b) False

Answer key

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

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