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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 106 · 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.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.💡 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  4. 4.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  5. 5.📶 How many states can a digital pin have? (a) one (b) two (c) ten (d) a thousand
  6. 6.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  8. 8.💡 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 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  10. 10.Which of these is an output? (a) a servo motor (b) a temperature sensor (c) a motion sensor (d) a light sensor
  11. 11.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  13. 13.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  14. 14.🔍 Which is the odd one out? (a) a buzzer (b) a motor (c) a temperature sensor (d) a water pump
  15. 15.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.Which of these is an output? (a) a turning knob (b) a motion sensor (c) a speaker (d) a sound sensor
  18. 18.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.💡 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 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  21. 21.Which of these is an output? (a) a light sensor (b) a push button (c) a buzzer (d) a sound sensor
  22. 22.🔍 Which is the odd one out? (a) a buzzer (b) a servo motor (c) an LED (d) a push button
  23. 23.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  24. 24.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  25. 25.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) a resistor (d) an input
  26. 26.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  27. 27.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  28. 28.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  29. 29.💡 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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.💡 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) OFF (b) ON
  31. 31.Which of these is an input? (a) a water pump (b) a speaker (c) a temperature sensor (d) a small display
  32. 32.📶 Digital or analog: the room temperature? (a) digital (b) analog
  33. 33.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  34. 34.🔍 Which is the odd one out? (a) a push button (b) a turning knob (c) a buzzer (d) a sound sensor
  35. 35.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  37. 37.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  38. 38.Which of these is an output? (a) a push button (b) a sound sensor (c) a light sensor (d) a water pump
  39. 39.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  40. 40.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog

Answer key

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

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