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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 471 · 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 an analog signal. (a) False (b) True
  2. 2.Which of these is an input? (a) a motor (b) a buzzer (c) a water pump (d) a turning knob
  3. 3.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 50 V (d) 230 V
  5. 5.Which of these is an output? (a) a sound sensor (b) a temperature sensor (c) a buzzer (d) a keypad
  6. 6.Which of these is an output? (a) a sound sensor (b) a motion sensor (c) a temperature sensor (d) a motor
  7. 7.Which of these is an output? (a) a keypad (b) a light sensor (c) a water pump (d) a push button
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.📶 Digital or analog: many values in a range? (a) analog (b) digital
  10. 10.💡 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
  11. 11.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  12. 12.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  15. 15.💡 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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  17. 17.Which of these is an input? (a) a speaker (b) a temperature sensor (c) a water pump (d) a small display
  18. 18.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  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 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  21. 21.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) an output (d) a resistor
  23. 23.📶 How many states can a digital pin have? (a) one (b) a thousand (c) two (d) ten
  24. 24.💡 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) ON (b) OFF
  25. 25.💡 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
  26. 26.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  27. 27.Which of these is an input? (a) a water pump (b) a buzzer (c) an LED (d) a keypad
  28. 28.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.🔍 Which is the odd one out? (a) a buzzer (b) a temperature sensor (c) a small display (d) a motor
  30. 30.Which of these is an input? (a) a light sensor (b) a buzzer (c) an LED (d) a motor
  31. 31.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  32. 32.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  33. 33.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  34. 34.🔍 Which is the odd one out? (a) a water pump (b) a sound sensor (c) a buzzer (d) a servo motor
  35. 35.🔍 Which is the odd one out? (a) a keypad (b) a buzzer (c) a push button (d) a motion sensor
  36. 36.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  37. 37.True or false: “many values in a range” is an analog signal. (a) False (b) True
  38. 38.🔍 Which is the odd one out? (a) a light sensor (b) a keypad (c) a temperature sensor (d) an LED
  39. 39.💡 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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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