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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 813 · 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.True or false: “the room temperature” is a digital signal. (a) True (b) False
  2. 2.Which of these is an output? (a) a turning knob (b) a temperature sensor (c) a push button (d) a water pump
  3. 3.🔍 Which is the odd one out? (a) a speaker (b) a turning knob (c) a push button (d) a sound sensor
  4. 4.📶 Digital or analog: the room temperature? (a) analog (b) digital
  5. 5.Which of these is an input? (a) a motion sensor (b) a buzzer (c) a speaker (d) an LED
  6. 6.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  7. 7.🔌 Is a light 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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  12. 12.Which of these is an input? (a) a small display (b) a buzzer (c) a speaker (d) a light sensor
  13. 13.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 50 V (d) 230 V
  14. 14.🔍 Which is the odd one out? (a) a turning knob (b) a sound sensor (c) a push button (d) a servo motor
  15. 15.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  16. 16.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  17. 17.Which of these is an output? (a) a keypad (b) a buzzer (c) a light sensor (d) a push button
  18. 18.💡 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) ON (b) OFF
  19. 19.🔍 Which is the odd one out? (a) a motor (b) a buzzer (c) a speaker (d) a motion sensor
  20. 20.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.Which of these is an input? (a) a water pump (b) a temperature sensor (c) an LED (d) a buzzer
  22. 22.🔍 Which is the odd one out? (a) a turning knob (b) a motor (c) a temperature sensor (d) a light sensor
  23. 23.Which of these is an input? (a) a small display (b) a water pump (c) a push button (d) a buzzer
  24. 24.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  26. 26.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  30. 30.🔍 Which is the odd one out? (a) a motor (b) a small display (c) a speaker (d) a keypad
  31. 31.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.🔍 Which is the odd one out? (a) a water pump (b) a temperature sensor (c) an LED (d) a small display
  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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.💡 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
  35. 35.💡 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
    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
  36. 36.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  37. 37.🔍 Which is the odd one out? (a) a push button (b) a water pump (c) an LED (d) a speaker
  38. 38.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.🔍 Which is the odd one out? (a) an LED (b) a motor (c) a speaker (d) a turning knob
  40. 40.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 5 V (d) 0 V

Answer key

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

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