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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 757 · 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 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.🔍 Which is the odd one out? (a) a turning knob (b) a small display (c) an LED (d) a buzzer
  4. 4.🔍 Which is the odd one out? (a) a motor (b) an LED (c) a buzzer (d) a keypad
  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.🔍 Which is the odd one out? (a) a servo motor (b) a small display (c) a push button (d) a water pump
  7. 7.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  8. 8.True or false: “the room temperature” is a digital signal. (a) True (b) False
  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
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.Which of these is an input? (a) a small display (b) a servo motor (c) a water pump (d) a sound sensor
  11. 11.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 5 V (d) 0 V
  12. 12.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.Which of these is an input? (a) a small display (b) an LED (c) a buzzer (d) a temperature sensor
  14. 14.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  15. 15.Which of these is an input? (a) a turning knob (b) a motor (c) a speaker (d) a water pump
  16. 16.🔍 Which is the odd one out? (a) a motion sensor (b) a buzzer (c) a light sensor (d) a temperature sensor
  17. 17.🔍 Which is the odd one out? (a) a motion sensor (b) a push button (c) a small display (d) a sound sensor
  18. 18.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  19. 19.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  20. 20.🔍 Which is the odd one out? (a) a turning knob (b) a temperature sensor (c) a light sensor (d) a motor
  21. 21.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  22. 22.🔍 Which is the odd one out? (a) a speaker (b) a light sensor (c) a buzzer (d) an LED
  23. 23.Which of these is an output? (a) a buzzer (b) a sound sensor (c) a temperature sensor (d) a light sensor
  24. 24.🔍 Which is the odd one out? (a) a motor (b) a temperature sensor (c) a water pump (d) a small display
  25. 25.Which of these is an input? (a) a buzzer (b) a motion sensor (c) an LED (d) a small display
  26. 26.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  27. 27.💡 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 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) a push button (d) a speaker
  29. 29.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  30. 30.True or false: “many values in a range” is a digital signal. (a) True (b) False
  31. 31.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  32. 32.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.🔌 Is a temperature sensor 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 HIGH
    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
  36. 36.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.Which of these is an output? (a) a sound sensor (b) a motor (c) a temperature sensor (d) a push button
  38. 38.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  39. 39.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.True or false: “how loud a sound is” is a digital signal. (a) True (b) False

Answer key

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

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