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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 889 · 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) a temperature sensor (b) a light sensor (c) an LED (d) a sound sensor
  2. 2.Which of these is an output? (a) a temperature sensor (b) a speaker (c) a turning knob (d) a light sensor
  3. 3.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  4. 4.Which of these is an output? (a) a water pump (b) a light sensor (c) a motion sensor (d) a push button
  5. 5.🔍 Which is the odd one out? (a) a temperature sensor (b) a small display (c) an LED (d) a buzzer
  6. 6.Which of these is an output? (a) a small display (b) a light sensor (c) a motion sensor (d) a push button
  7. 7.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a battery (d) a resistor
  8. 8.🔍 Which is the odd one out? (a) a temperature sensor (b) a keypad (c) a turning knob (d) a water pump
  9. 9.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.💡 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
  11. 11.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  12. 12.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.🔍 Which is the odd one out? (a) a buzzer (b) a servo motor (c) a small display (d) a turning knob
  14. 14.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  15. 15.💡 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 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  17. 17.Which of these is an input? (a) a speaker (b) a servo motor (c) a small display (d) a keypad
  18. 18.Which of these is an input? (a) an LED (b) a buzzer (c) a temperature sensor (d) a water pump
  19. 19.📶 How many states can a digital pin have? (a) one (b) ten (c) two (d) a thousand
  20. 20.🔍 Which is the odd one out? (a) a speaker (b) a light sensor (c) a small display (d) a water pump
  21. 21.💡 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
  22. 22.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  24. 24.Which of these is an output? (a) a turning knob (b) a buzzer (c) a keypad (d) a sound sensor
  25. 25.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  26. 26.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  27. 27.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  28. 28.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  29. 29.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  30. 30.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  32. 32.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 9 V (d) 5 V
  33. 33.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.💡 An LED (with its resistor) is on pin 7. 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
  35. 35.📶 Digital or analog: many values in a range? (a) analog (b) digital
  36. 36.Which of these is an input? (a) a motor (b) a water pump (c) a light sensor (d) a buzzer
  37. 37.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  39. 39.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 230 V (d) 50 V

Answer key

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

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