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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 769 · 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 8 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  3. 3.Which of these is an output? (a) a sound sensor (b) a small display (c) a turning knob (d) a temperature sensor
  4. 4.📶 How many states can a digital pin have? (a) one (b) a thousand (c) ten (d) two
  5. 5.🔍 Which is the odd one out? (a) a push button (b) a turning knob (c) a small display (d) a light sensor
  6. 6.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  7. 7.🔍 Which is the odd one out? (a) an LED (b) a speaker (c) a servo motor (d) a sound sensor
  8. 8.Which of these is an input? (a) a water pump (b) a buzzer (c) a motion sensor (d) a servo motor
  9. 9.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  10. 10.📶 Digital or analog: the room temperature? (a) analog (b) digital
  11. 11.💡 An LED (with its resistor) is on pin 7. 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
  12. 12.🔍 Which is the odd one out? (a) a motion sensor (b) a motor (c) a small display (d) a servo motor
  13. 13.🔍 Which is the odd one out? (a) a buzzer (b) a light sensor (c) an LED (d) a small display
  14. 14.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  15. 15.🔍 Which is the odd one out? (a) a motion sensor (b) a keypad (c) an LED (d) a temperature sensor
  16. 16.🔍 Which is the odd one out? (a) a motion sensor (b) a temperature sensor (c) a sound sensor (d) a water pump
  17. 17.Which of these is an output? (a) a temperature sensor (b) a motor (c) a light sensor (d) a keypad
  18. 18.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  19. 19.🔍 Which is the odd one out? (a) a buzzer (b) a push button (c) a motion sensor (d) a sound sensor
  20. 20.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  21. 21.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  22. 22.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  23. 23.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  24. 24.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  25. 25.Which of these is an input? (a) an LED (b) a water pump (c) a small display (d) a sound sensor
  26. 26.🔍 Which is the odd one out? (a) a turning knob (b) a motion sensor (c) a speaker (d) a temperature sensor
  27. 27.💡 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
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 5 V (d) 0 V
  30. 30.Which of these is an output? (a) a turning knob (b) a sound sensor (c) a speaker (d) a light sensor
  31. 31.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 50 V (d) 230 V
  33. 33.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  34. 34.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.Which of these is an output? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a buzzer
  37. 37.📶 Digital or analog: many values in a range? (a) analog (b) digital
  38. 38.Which of these is an output? (a) a turning knob (b) an LED (c) a motion sensor (d) a keypad
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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