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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 867 · 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.📶 How many states can a digital pin have? (a) ten (b) two (c) one (d) a thousand
  2. 2.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.Which of these is an input? (a) a light sensor (b) a buzzer (c) a water pump (d) a motor
  4. 4.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  5. 5.Which of these is an input? (a) a speaker (b) a buzzer (c) a push button (d) a motor
  6. 6.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  7. 7.Which of these is an output? (a) a sound sensor (b) a motion sensor (c) a temperature sensor (d) a buzzer
  8. 8.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.🔍 Which is the odd one out? (a) a water pump (b) a speaker (c) a keypad (d) a buzzer
  10. 10.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  11. 11.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  12. 12.🔍 Which is the odd one out? (a) a water pump (b) a buzzer (c) an LED (d) a motion sensor
  13. 13.Which of these is an output? (a) a motion sensor (b) a keypad (c) a sound sensor (d) a small display
  14. 14.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  16. 16.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  17. 17.🔍 Which is the odd one out? (a) a temperature sensor (b) a keypad (c) a small display (d) a push button
  18. 18.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 0 V (d) 1.5 V
  19. 19.💡 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
  20. 20.Which of these is an output? (a) a motion sensor (b) a light sensor (c) a water pump (d) a turning knob
  21. 21.🔍 Which is the odd one out? (a) an LED (b) a temperature sensor (c) a motion sensor (d) a push button
  22. 22.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  23. 23.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  24. 24.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  25. 25.Which of these is an output? (a) a servo motor (b) a turning knob (c) a light sensor (d) a push button
  26. 26.🔍 Which is the odd one out? (a) a temperature sensor (b) a light sensor (c) a buzzer (d) a push button
  27. 27.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  28. 28.True or false: “many values in a range” is an analog signal. (a) True (b) False
  29. 29.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  30. 30.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  31. 31.💡 An LED (with its resistor) is on pin 7. 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
  32. 32.🔍 Which is the odd one out? (a) a push button (b) a servo motor (c) a keypad (d) a turning knob
  33. 33.🔌 Is a motion sensor 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 buzzer (c) a temperature sensor (d) a speaker
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  37. 37.Which of these is an input? (a) a buzzer (b) a speaker (c) a keypad (d) a servo motor
  38. 38.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  39. 39.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.💡 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
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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