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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 182 · 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.🔍 Which is the odd one out? (a) a keypad (b) a temperature sensor (c) a sound sensor (d) a servo motor
  2. 2.📶 How many states can a digital pin have? (a) a thousand (b) two (c) ten (d) one
  3. 3.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  4. 4.Which of these is an output? (a) a light sensor (b) a push button (c) a temperature sensor (d) a buzzer
  5. 5.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  6. 6.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  7. 7.🔍 Which is the odd one out? (a) a servo motor (b) a small display (c) a buzzer (d) a motion sensor
  8. 8.💡 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
  9. 9.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  10. 10.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an output (d) an input
  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 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  13. 13.Which of these is an input? (a) a servo motor (b) an LED (c) a motor (d) a sound sensor
  14. 14.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  15. 15.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  16. 16.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  17. 17.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  18. 18.🔍 Which is the odd one out? (a) a speaker (b) a sound sensor (c) a small display (d) an LED
  19. 19.🔍 Which is the odd one out? (a) a small display (b) a temperature sensor (c) a buzzer (d) a speaker
  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
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.Which of these is an output? (a) a light sensor (b) a water pump (c) a motion sensor (d) a sound sensor
  23. 23.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  24. 24.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  26. 26.Which of these is an input? (a) an LED (b) a motor (c) a buzzer (d) a motion sensor
  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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.💡 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
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  30. 30.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 5 V (d) 50 V
  31. 31.Which of these is an input? (a) a motor (b) a buzzer (c) a temperature sensor (d) a speaker
  32. 32.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  33. 33.🔍 Which is the odd one out? (a) a small display (b) a motor (c) an LED (d) a light sensor
  34. 34.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  36. 36.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  37. 37.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  38. 38.🔍 Which is the odd one out? (a) a sound sensor (b) an LED (c) a push button (d) a turning knob
  39. 39.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  40. 40.Which of these is an output? (a) a motion sensor (b) a motor (c) a push button (d) a sound sensor

Answer key

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

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