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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 828 · 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 water pump an input or an output for a microcontroller? (a) input (b) output
  2. 2.Which of these is an input? (a) a motor (b) a sound sensor (c) a speaker (d) a small display
  3. 3.🔍 Which is the odd one out? (a) a light sensor (b) a servo motor (c) a temperature sensor (d) a motion sensor
  4. 4.💡 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
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.Which of these is an input? (a) a small display (b) a motor (c) a servo motor (d) a light sensor
  6. 6.📶 How many states can a digital pin have? (a) one (b) a thousand (c) two (d) ten
  7. 7.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 1.5 V (d) 0 V
  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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.Which of these is an output? (a) a keypad (b) a turning knob (c) a buzzer (d) a push button
  11. 11.Which of these is an output? (a) a speaker (b) a sound sensor (c) a temperature sensor (d) a light sensor
  12. 12.True or false: “many values in a range” is a digital signal. (a) True (b) False
  13. 13.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  14. 14.Which of these is an output? (a) a push button (b) a motor (c) a motion sensor (d) a temperature sensor
  15. 15.💡 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
    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) True (b) False
  17. 17.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 0 V (d) 230 V
  19. 19.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  20. 20.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  21. 21.🔍 Which is the odd one out? (a) a servo motor (b) a motor (c) an LED (d) a light sensor
  22. 22.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  23. 23.💡 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
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.True or false: “the room temperature” is an analog signal. (a) True (b) False
  25. 25.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  26. 26.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  27. 27.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  28. 28.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  29. 29.🔍 Which is the odd one out? (a) a sound sensor (b) a servo motor (c) a motor (d) an LED
  30. 30.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  31. 31.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  32. 32.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  33. 33.Which of these is an input? (a) a motion sensor (b) a buzzer (c) a speaker (d) an LED
  34. 34.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.💡 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
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  38. 38.🔍 Which is the odd one out? (a) a speaker (b) a push button (c) a turning knob (d) a light sensor
  39. 39.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  40. 40.True or false: “a door: open or shut” is an analog signal. (a) False (b) True

Answer key

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

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