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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 762 · 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 buzzer (b) a sound sensor (c) a speaker (d) a small display
  2. 2.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 230 V (d) 50 V
  3. 3.Which of these is an input? (a) a motor (b) a small display (c) a motion sensor (d) an LED
  4. 4.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  5. 5.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  6. 6.🔍 Which is the odd one out? (a) a buzzer (b) a push button (c) an LED (d) a motor
  7. 7.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  8. 8.📶 How many states can a digital pin have? (a) two (b) ten (c) a thousand (d) one
  9. 9.Which of these is an input? (a) a turning knob (b) a water pump (c) an LED (d) a buzzer
  10. 10.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  11. 11.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  12. 12.🔍 Which is the odd one out? (a) a motor (b) a light sensor (c) a buzzer (d) a water pump
  13. 13.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  14. 14.🔍 Which is the odd one out? (a) a push button (b) a sound sensor (c) a motor (d) a turning knob
  15. 15.Which of these is an input? (a) an LED (b) a water pump (c) a light sensor (d) a motor
  16. 16.🔍 Which is the odd one out? (a) a servo motor (b) a small display (c) a turning knob (d) a motor
  17. 17.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  18. 18.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  19. 19.🔍 Which is the odd one out? (a) a speaker (b) a turning knob (c) a push button (d) a temperature sensor
  20. 20.💡 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 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.📶 Digital or analog: many values in a range? (a) analog (b) digital
  23. 23.💡 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 9 V (d) 0 V
  25. 25.📶 Digital or analog: the room temperature? (a) digital (b) analog
  26. 26.True or false: “many values in a range” is an analog signal. (a) False (b) True
  27. 27.True or false: “how bright a room is” is an analog 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 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  30. 30.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  31. 31.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    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 7 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  34. 34.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  35. 35.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  36. 36.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  37. 37.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.🔍 Which is the odd one out? (a) a temperature sensor (b) a motion sensor (c) a small display (d) a sound sensor
  39. 39.💡 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 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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