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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 932 · 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 loud a sound is” is a digital signal. (a) False (b) True
  2. 2.🔍 Which is the odd one out? (a) a buzzer (b) an LED (c) a turning knob (d) a speaker
  3. 3.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.💡 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
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  6. 6.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  8. 8.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  9. 9.💡 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
  10. 10.Which of these is an input? (a) a small display (b) a servo motor (c) a keypad (d) a water pump
  11. 11.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  12. 12.🔍 Which is the odd one out? (a) an LED (b) a temperature sensor (c) a water pump (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 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.🔍 Which is the odd one out? (a) a motor (b) a buzzer (c) a speaker (d) a push button
  15. 15.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  16. 16.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  17. 17.True or false: “many values in a range” is an analog signal. (a) True (b) False
  18. 18.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  19. 19.💡 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
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.💡 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 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  22. 22.📶 How many states can a digital pin have? (a) two (b) ten (c) one (d) a thousand
  23. 23.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  24. 24.🔍 Which is the odd one out? (a) a light sensor (b) a turning knob (c) a small display (d) a keypad
  25. 25.Which of these is an output? (a) a motion sensor (b) a sound sensor (c) a light sensor (d) a buzzer
  26. 26.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  27. 27.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    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
  29. 29.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a water pump (d) a speaker
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  33. 33.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  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
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.🔍 Which is the odd one out? (a) a motion sensor (b) a light sensor (c) a push button (d) a motor
  36. 36.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  37. 37.💡 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) ON (b) OFF
  38. 38.💡 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
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  40. 40.🔍 Which is the odd one out? (a) a motion sensor (b) a motor (c) a small display (d) a speaker

Answer key

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

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