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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 795 · 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.🔍 Which is the odd one out? (a) an LED (b) a servo motor (c) a buzzer (d) a motion sensor
  2. 2.Which of these is an input? (a) an LED (b) a buzzer (c) a small display (d) a turning knob
  3. 3.🔍 Which is the odd one out? (a) a turning knob (b) a push button (c) a temperature sensor (d) a servo motor
  4. 4.True or false: “the room temperature” is an analog signal. (a) False (b) True
  5. 5.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  6. 6.📶 Digital or analog: the room temperature? (a) digital (b) analog
  7. 7.🔍 Which is the odd one out? (a) a servo motor (b) a keypad (c) a buzzer (d) a motor
  8. 8.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  9. 9.Which of these is an input? (a) a temperature sensor (b) a speaker (c) a small display (d) a buzzer
  10. 10.Which of these is an input? (a) a push button (b) a buzzer (c) an LED (d) a small display
  11. 11.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  12. 12.📶 How many states can a digital pin have? (a) ten (b) two (c) one (d) a thousand
  13. 13.🔍 Which is the odd one out? (a) a turning knob (b) a water pump (c) a servo motor (d) an LED
  14. 14.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  15. 15.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.🔍 Which is the odd one out? (a) an LED (b) a push button (c) a turning knob (d) a light sensor
  17. 17.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  18. 18.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  19. 19.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  20. 20.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.Which of these is an output? (a) a motion sensor (b) a speaker (c) a temperature sensor (d) a light sensor
  22. 22.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  24. 24.Which of these is an output? (a) a light sensor (b) a keypad (c) a motor (d) a temperature sensor
  25. 25.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 0 V (d) 9 V
  26. 26.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  27. 27.💡 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 8 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.Which of these is an input? (a) a buzzer (b) an LED (c) a speaker (d) a motion sensor
  29. 29.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  30. 30.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.Which of these is an input? (a) a speaker (b) a keypad (c) an LED (d) a water pump
  32. 32.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  33. 33.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  35. 35.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  36. 36.🔍 Which is the odd one out? (a) a motion sensor (b) a small display (c) a temperature sensor (d) a push button
  37. 37.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  40. 40.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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