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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 722 · 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 keypad an input or an output for a microcontroller? (a) input (b) output
  2. 2.🔍 Which is the odd one out? (a) an LED (b) a water pump (c) a speaker (d) a push button
  3. 3.💡 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
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  5. 5.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  6. 6.Which of these is an input? (a) a servo motor (b) a motor (c) a temperature sensor (d) a water pump
  7. 7.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 5 V (d) 0 V
  8. 8.🔍 Which is the odd one out? (a) a water pump (b) an LED (c) a temperature sensor (d) a buzzer
  9. 9.Which of these is an input? (a) an LED (b) a turning knob (c) a servo motor (d) a speaker
  10. 10.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  11. 11.Which of these is an output? (a) a water pump (b) a sound sensor (c) a turning knob (d) a keypad
  12. 12.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  13. 13.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  14. 14.Which of these is an input? (a) a buzzer (b) a water pump (c) a motion sensor (d) a speaker
  15. 15.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a resistor (d) a battery
  16. 16.🔍 Which is the odd one out? (a) a small display (b) an LED (c) a light sensor (d) a servo motor
  17. 17.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  19. 19.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  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 turning knob (b) a speaker (c) an LED (d) a water pump
  22. 22.📶 How many states can a digital pin have? (a) two (b) a thousand (c) one (d) ten
  23. 23.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 0 V (d) 5 V
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  27. 27.Which of these is an output? (a) a keypad (b) a sound sensor (c) a push button (d) a buzzer
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  30. 30.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  31. 31.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.🔍 Which is the odd one out? (a) a turning knob (b) a light sensor (c) a sound sensor (d) a speaker
  33. 33.📶 Digital or analog: many values in a range? (a) analog (b) digital
  34. 34.Which of these is an input? (a) a motor (b) a buzzer (c) a speaker (d) a light sensor
  35. 35.💡 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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) a buzzer (d) a keypad
  37. 37.📶 Digital or analog: the room temperature? (a) analog (b) digital
  38. 38.💡 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) OFF (b) ON
  39. 39.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  40. 40.True or false: “how bright a room is” is a digital signal. (a) False (b) True

Answer key

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

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