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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 617 · 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) True (b) False
  2. 2.💡 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 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  4. 4.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  5. 5.Which of these is an input? (a) a water pump (b) a sound sensor (c) a servo motor (d) an LED
  6. 6.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) a keypad (d) a small display
  7. 7.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  8. 8.Which of these is an output? (a) a water pump (b) a temperature sensor (c) a light sensor (d) a sound sensor
  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 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  12. 12.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 5 V (d) 50 V
  14. 14.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  15. 15.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  16. 16.📶 Digital or analog: the room temperature? (a) analog (b) digital
  17. 17.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.Which of these is an input? (a) a buzzer (b) a speaker (c) a motion sensor (d) an LED
  19. 19.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 0 V (d) 5 V
  20. 20.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  23. 23.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  25. 25.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  26. 26.Which of these is an input? (a) a keypad (b) a water pump (c) a servo motor (d) a small display
  27. 27.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  28. 28.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.True or false: “many values in a range” is a digital signal. (a) False (b) True
  30. 30.Which of these is an output? (a) a keypad (b) a temperature sensor (c) an LED (d) a motion sensor
  31. 31.📶 How many states can a digital pin have? (a) one (b) a thousand (c) two (d) ten
  32. 32.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  33. 33.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  34. 34.🔍 Which is the odd one out? (a) an LED (b) a small display (c) a buzzer (d) a push button
  35. 35.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  38. 38.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  39. 39.💡 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
  40. 40.🔍 Which is the odd one out? (a) a small display (b) a buzzer (c) a motion sensor (d) an LED

Answer key

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

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