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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 499 · 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.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.🔍 Which is the odd one out? (a) a push button (b) a small display (c) a buzzer (d) a speaker
  3. 3.💡 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
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  5. 5.Which of these is an output? (a) a push button (b) a sound sensor (c) an LED (d) a motion sensor
  6. 6.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 9 V (d) 1.5 V
  7. 7.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  8. 8.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  12. 12.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 50 V (d) 0 V
  13. 13.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  14. 14.Which of these is an output? (a) a keypad (b) a water pump (c) a turning knob (d) a sound sensor
  15. 15.True or false: “the room temperature” is an analog signal. (a) True (b) False
  16. 16.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  17. 17.🔍 Which is the odd one out? (a) a small display (b) a turning knob (c) a servo motor (d) a motor
  18. 18.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  19. 19.💡 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 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.📶 Digital or analog: many values in a range? (a) analog (b) digital
  21. 21.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  22. 22.💡 An LED (with its resistor) is on pin 8. 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) ON (b) OFF
  23. 23.Which of these is an input? (a) a motor (b) a servo motor (c) an LED (d) a keypad
  24. 24.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  25. 25.Which of these is an output? (a) a push button (b) a sound sensor (c) a motor (d) a temperature sensor
  26. 26.Which of these is an output? (a) a sound sensor (b) a buzzer (c) a keypad (d) a motion sensor
  27. 27.💡 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 8 HIGH
    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 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.Which of these is an input? (a) a push button (b) an LED (c) a buzzer (d) a water pump
  32. 32.🔍 Which is the odd one out? (a) a water pump (b) a small display (c) a light sensor (d) an LED
  33. 33.Which of these is an input? (a) a light sensor (b) a buzzer (c) a speaker (d) a small display
  34. 34.📶 How many states can a digital pin have? (a) ten (b) one (c) two (d) a thousand
  35. 35.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  36. 36.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  37. 37.🔍 Which is the odd one out? (a) a servo motor (b) a motion sensor (c) a buzzer (d) a small display
  38. 38.Which of these is an input? (a) a servo motor (b) a motion sensor (c) a motor (d) a small display
  39. 39.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  40. 40.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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