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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 991 · 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 of these is an output? (a) a keypad (b) a motion sensor (c) a small display (d) a turning knob
  2. 2.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  3. 3.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  4. 4.🔍 Which is the odd one out? (a) an LED (b) a temperature sensor (c) a motion sensor (d) a turning knob
  5. 5.Which of these is an output? (a) an LED (b) a push button (c) a light sensor (d) a temperature sensor
  6. 6.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.🔍 Which is the odd one out? (a) a small display (b) a temperature sensor (c) a speaker (d) a water pump
  8. 8.True or false: “many values in a range” is a digital signal. (a) True (b) False
  9. 9.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 50 V (d) 230 V
  10. 10.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  11. 11.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  12. 12.Which of these is an input? (a) a push button (b) a small display (c) a servo motor (d) a motor
  13. 13.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) two (d) one
  14. 14.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  15. 15.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  17. 17.Which of these is an output? (a) a turning knob (b) a sound sensor (c) a keypad (d) a servo motor
  18. 18.💡 An LED (with its resistor) is on pin 7. 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
  19. 19.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  20. 20.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  21. 21.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.🔍 Which is the odd one out? (a) a sound sensor (b) an LED (c) a small display (d) a water pump
  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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 0 V (d) 5 V
  25. 25.Which of these is an output? (a) a push button (b) a motor (c) a motion sensor (d) a sound sensor
  26. 26.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  27. 27.💡 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) ON (b) OFF
  28. 28.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.💡 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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.Which of these is an input? (a) a buzzer (b) a small display (c) a servo motor (d) a keypad
  31. 31.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  32. 32.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a motor (d) a water pump
  33. 33.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  34. 34.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  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 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  37. 37.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  40. 40.💡 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

Answer key

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

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