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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 536 · 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 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
  2. 2.🔍 Which is the odd one out? (a) a buzzer (b) a push button (c) a temperature sensor (d) a sound sensor
  3. 3.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  4. 4.📶 Digital or analog: many values in a range? (a) digital (b) analog
  5. 5.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  6. 6.💡 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  8. 8.Which of these is an input? (a) a water pump (b) a temperature sensor (c) an LED (d) a motor
  9. 9.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a resistor (d) a battery
  10. 10.True or false: “the room temperature” is an analog signal. (a) False (b) True
  11. 11.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  12. 12.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  13. 13.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  14. 14.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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) ON (b) OFF
  16. 16.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.Which of these is an input? (a) a buzzer (b) a water pump (c) a speaker (d) a push button
  18. 18.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 50 V (d) 0 V
  19. 19.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  21. 21.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  22. 22.💡 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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.🔍 Which is the odd one out? (a) a turning knob (b) a light sensor (c) a small display (d) a motion sensor
  24. 24.Which of these is an input? (a) a keypad (b) a small display (c) a buzzer (d) an LED
  25. 25.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  26. 26.Which of these is an output? (a) a sound sensor (b) a turning knob (c) a temperature sensor (d) a buzzer
  27. 27.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  28. 28.🔍 Which is the odd one out? (a) a light sensor (b) a motion sensor (c) an LED (d) a turning knob
  29. 29.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  30. 30.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.💡 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) OFF (b) ON
  33. 33.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  34. 34.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  35. 35.🔍 Which is the odd one out? (a) a speaker (b) a motor (c) an LED (d) a sound sensor
  36. 36.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 0 V (d) 9 V
  37. 37.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) one (d) two
  38. 38.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  40. 40.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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