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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 112 · 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.📶 Digital or analog: the room temperature? (a) digital (b) analog
  2. 2.Which of these is an output? (a) a push button (b) a speaker (c) a sound sensor (d) a temperature sensor
  3. 3.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) an input (d) a battery
  4. 4.Which of these is an output? (a) a buzzer (b) a light sensor (c) a sound sensor (d) a keypad
  5. 5.🔍 Which is the odd one out? (a) a buzzer (b) a keypad (c) a water pump (d) an LED
  6. 6.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 0 V (d) 1.5 V
  7. 7.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  8. 8.True or false: “the room temperature” is an analog signal. (a) False (b) True
  9. 9.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  10. 10.🔍 Which is the odd one out? (a) a push button (b) a servo motor (c) a water pump (d) a buzzer
  11. 11.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  13. 13.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  14. 14.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  15. 15.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  16. 16.💡 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 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.Which of these is an input? (a) a small display (b) a light sensor (c) an LED (d) a buzzer
  18. 18.🔍 Which is the odd one out? (a) a push button (b) a light sensor (c) a servo motor (d) a sound sensor
  19. 19.Which of these is an output? (a) a turning knob (b) a small display (c) a temperature sensor (d) a sound sensor
  20. 20.Which of these is an input? (a) a buzzer (b) a speaker (c) a turning knob (d) a servo motor
  21. 21.Which of these is an input? (a) a water pump (b) a motion sensor (c) a servo motor (d) a small display
  22. 22.Which of these is an output? (a) an LED (b) a light sensor (c) a temperature sensor (d) a motion sensor
  23. 23.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  24. 24.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.True or false: “many values in a range” is a digital signal. (a) False (b) True
  28. 28.💡 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) OFF (b) ON
  29. 29.Which of these is an input? (a) a sound sensor (b) an LED (c) a small display (d) a servo motor
  30. 30.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 230 V (d) 0 V
  31. 31.💡 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) ON (b) OFF
  32. 32.Which of these is an output? (a) a sound sensor (b) a servo motor (c) a push button (d) a motion sensor
  33. 33.💡 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
  34. 34.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  35. 35.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  36. 36.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.💡 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
  38. 38.🔍 Which is the odd one out? (a) a small display (b) a turning knob (c) a sound sensor (d) a motion sensor
  39. 39.🔍 Which is the odd one out? (a) a small display (b) a buzzer (c) an LED (d) a motion sensor
  40. 40.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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