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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 221 · 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 motion sensor an input or an output for a microcontroller? (a) output (b) input
  2. 2.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 1.5 V (d) 0 V
  3. 3.Which of these is an input? (a) a small display (b) a water pump (c) a buzzer (d) a turning knob
  4. 4.Which of these is an output? (a) a turning knob (b) an LED (c) a keypad (d) a temperature sensor
  5. 5.💡 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
  6. 6.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  7. 7.Which of these is an input? (a) a servo motor (b) a keypad (c) an LED (d) a speaker
  8. 8.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  9. 9.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  10. 10.Which of these is an output? (a) a keypad (b) a light sensor (c) a servo motor (d) a temperature sensor
  11. 11.Which of these is an input? (a) a water pump (b) a speaker (c) a light sensor (d) a buzzer
  12. 12.🔍 Which is the odd one out? (a) an LED (b) a light sensor (c) a temperature sensor (d) a sound sensor
  13. 13.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  14. 14.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.📶 How many states can a digital pin have? (a) one (b) a thousand (c) ten (d) two
  16. 16.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  17. 17.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  21. 21.📶 Digital or analog: the room temperature? (a) analog (b) digital
  22. 22.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  23. 23.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  24. 24.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 5 V (d) 230 V
  25. 25.🔍 Which is the odd one out? (a) a servo motor (b) a motion sensor (c) a water pump (d) a small display
  26. 26.🔍 Which is the odd one out? (a) a sound sensor (b) a servo motor (c) a motor (d) a speaker
  27. 27.💡 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 LOW
    set pin 7 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 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  31. 31.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  32. 32.🔍 Which is the odd one out? (a) a buzzer (b) a light sensor (c) a temperature sensor (d) a sound sensor
  33. 33.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  34. 34.📶 Digital or analog: many values in a range? (a) analog (b) digital
  35. 35.💡 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) OFF (b) ON
  36. 36.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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
    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
  38. 38.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  39. 39.🔍 Which is the odd one out? (a) a turning knob (b) a sound sensor (c) a motor (d) a light sensor
  40. 40.Which of these is an input? (a) a small display (b) a servo motor (c) a buzzer (d) a motion sensor

Answer key

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

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