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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 467 · 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.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  2. 2.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  3. 3.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  4. 4.🔍 Which is the odd one out? (a) a speaker (b) a buzzer (c) an LED (d) a motion sensor
  5. 5.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.Which of these is an input? (a) a motion sensor (b) a servo motor (c) an LED (d) a small display
  7. 7.🔍 Which is the odd one out? (a) a motor (b) a small display (c) a servo motor (d) a temperature sensor
  8. 8.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 50 V (d) 5 V
  9. 9.Which of these is an output? (a) a motion sensor (b) a water pump (c) a sound sensor (d) a light sensor
  10. 10.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  11. 11.Which of these is an input? (a) a small display (b) a servo motor (c) an LED (d) a light sensor
  12. 12.Which of these is an input? (a) an LED (b) a speaker (c) a push button (d) a buzzer
  13. 13.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.Which of these is an output? (a) a push button (b) a temperature sensor (c) a small display (d) a keypad
  15. 15.🔍 Which is the odd one out? (a) a turning knob (b) a speaker (c) a sound sensor (d) a motion sensor
  16. 16.📶 How many states can a digital pin have? (a) one (b) ten (c) two (d) a thousand
  17. 17.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  18. 18.🔍 Which is the odd one out? (a) a turning knob (b) a push button (c) a light sensor (d) a servo motor
  19. 19.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  20. 20.💡 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
  21. 21.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  22. 22.🔍 Which is the odd one out? (a) a temperature sensor (b) a sound sensor (c) a motor (d) a motion sensor
  23. 23.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a push button (d) a sound sensor
  24. 24.🔍 Which is the odd one out? (a) a push button (b) a motor (c) a buzzer (d) a water pump
  25. 25.🔍 Which is the odd one out? (a) a sound sensor (b) a small display (c) a motor (d) a water pump
  26. 26.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  27. 27.💡 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
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) a sound sensor (d) an LED
  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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  31. 31.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 0 V (d) 1.5 V
  32. 32.🔍 Which is the odd one out? (a) a light sensor (b) a small display (c) a speaker (d) a servo motor
  33. 33.Which of these is an input? (a) a keypad (b) a speaker (c) an LED (d) a motor
  34. 34.💡 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) ON (b) OFF
  35. 35.Which of these is an output? (a) a speaker (b) a turning knob (c) a keypad (d) a motion sensor
  36. 36.💡 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) OFF (b) ON
  37. 37.💡 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) OFF (b) ON
  38. 38.🔍 Which is the odd one out? (a) a buzzer (b) a sound sensor (c) a push button (d) a motion sensor
  39. 39.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  40. 40.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog

Answer key

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

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