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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 526 · 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.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) an output (d) a resistor
  2. 2.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  3. 3.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  4. 4.Which of these is an input? (a) a speaker (b) a motor (c) an LED (d) a light sensor
  5. 5.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  6. 6.🔍 Which is the odd one out? (a) a turning knob (b) a sound sensor (c) a buzzer (d) a light sensor
  7. 7.Which of these is an output? (a) a turning knob (b) a motion sensor (c) a keypad (d) a buzzer
  8. 8.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  9. 9.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  10. 10.💡 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) ON (b) OFF
  11. 11.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  12. 12.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 9 V (d) 0 V
  13. 13.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  14. 14.💡 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 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  16. 16.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  17. 17.🔍 Which is the odd one out? (a) a motion sensor (b) a push button (c) a water pump (d) a keypad
  18. 18.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  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 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.True or false: “many values in a range” is a digital signal. (a) False (b) True
  21. 21.Which of these is an input? (a) a temperature sensor (b) a motor (c) a buzzer (d) a speaker
  22. 22.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  23. 23.📶 Digital or analog: the room temperature? (a) digital (b) analog
  24. 24.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  25. 25.🔌 Is a light sensor 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 8 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  29. 29.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  30. 30.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  31. 31.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  32. 32.📶 Digital or analog: many values in a range? (a) analog (b) digital
  33. 33.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  34. 34.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.Which of these is an input? (a) a sound sensor (b) a small display (c) a servo motor (d) a motor
  36. 36.Which of these is an input? (a) a push button (b) a small display (c) a motor (d) a servo motor
  37. 37.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  38. 38.Which of these is an output? (a) a keypad (b) a turning knob (c) a push button (d) a speaker
  39. 39.🔍 Which is the odd one out? (a) a keypad (b) a small display (c) a motor (d) an LED
  40. 40.🔍 Which is the odd one out? (a) a speaker (b) a motion sensor (c) a push button (d) a temperature sensor

Answer key

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

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