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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 118 · 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 push button (b) a buzzer (c) a temperature sensor (d) a keypad
  2. 2.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  3. 3.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 50 V (d) 5 V
  4. 4.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  5. 5.Which of these is an input? (a) a light sensor (b) a motor (c) a servo motor (d) a water pump
  6. 6.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  7. 7.🔍 Which is the odd one out? (a) a speaker (b) a small display (c) a motor (d) a push button
  8. 8.🔍 Which is the odd one out? (a) a water pump (b) an LED (c) a speaker (d) a keypad
  9. 9.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  10. 10.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) one (d) two
  11. 11.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  13. 13.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.Which of these is an output? (a) a servo motor (b) a push button (c) a light sensor (d) a sound sensor
  18. 18.💡 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) ON (b) OFF
  19. 19.Which of these is an input? (a) a buzzer (b) a turning knob (c) a small display (d) an LED
  20. 20.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 5 V (d) 0 V
  21. 21.Which of these is an output? (a) a turning knob (b) a motion sensor (c) an LED (d) a temperature sensor
  22. 22.Which of these is an output? (a) a motor (b) a light sensor (c) a keypad (d) a sound sensor
  23. 23.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  24. 24.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  25. 25.💡 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
  26. 26.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  27. 27.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.💡 An LED (with its resistor) is on pin 7. 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) OFF (b) ON
  29. 29.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  30. 30.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a buzzer (d) a motor
  32. 32.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  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 8 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  37. 37.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  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 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.Which of these is an output? (a) a temperature sensor (b) a push button (c) a water pump (d) a motion sensor

Answer key

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

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