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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 582 · 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 motor (b) a temperature sensor (c) a push button (d) a light sensor
  2. 2.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 0 V (d) 5 V
  3. 3.💡 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
  4. 4.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  5. 5.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  6. 6.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  7. 7.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  8. 8.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  11. 11.True or false: “many values in a range” is a digital signal. (a) False (b) True
  12. 12.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 230 V (d) 50 V
  13. 13.🔍 Which is the odd one out? (a) a servo motor (b) a buzzer (c) an LED (d) a keypad
  14. 14.Which of these is an output? (a) a temperature sensor (b) a motion sensor (c) a keypad (d) an LED
  15. 15.Which of these is an input? (a) a small display (b) a motion sensor (c) a water pump (d) an LED
  16. 16.Which of these is an output? (a) a water pump (b) a temperature sensor (c) a turning knob (d) a sound sensor
  17. 17.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  19. 19.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  20. 20.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  21. 21.💡 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) ON (b) OFF
  22. 22.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  23. 23.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  24. 24.💡 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) ON (b) OFF
  25. 25.True or false: “many values in a range” is an analog signal. (a) True (b) False
  26. 26.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  27. 27.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  28. 28.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.Which of these is an input? (a) a motor (b) a servo motor (c) a push button (d) a buzzer
  30. 30.🔍 Which is the odd one out? (a) a motion sensor (b) a buzzer (c) a temperature sensor (d) a push button
  31. 31.💡 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
  32. 32.🔍 Which is the odd one out? (a) a speaker (b) a motor (c) a light sensor (d) a servo motor
  33. 33.Which of these is an input? (a) an LED (b) a light sensor (c) a speaker (d) a buzzer
  34. 34.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  35. 35.True or false: “the room temperature” is an analog signal. (a) False (b) True
  36. 36.Which of these is an output? (a) a temperature sensor (b) a keypad (c) a buzzer (d) a push button
  37. 37.🔍 Which is the odd one out? (a) a water pump (b) a small display (c) a push button (d) a motor
  38. 38.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  39. 39.💡 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
  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
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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