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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 733 · 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 of these is an output? (a) a keypad (b) a sound sensor (c) a light sensor (d) a small display
  2. 2.📶 How many states can a digital pin have? (a) a thousand (b) one (c) ten (d) two
  3. 3.Which of these is an input? (a) a keypad (b) an LED (c) a water pump (d) a servo motor
  4. 4.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  5. 5.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  6. 6.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  7. 7.💡 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 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  9. 9.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  10. 10.💡 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
  11. 11.Which of these is an input? (a) a push button (b) a water pump (c) a buzzer (d) a small display
  12. 12.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 230 V (d) 50 V
  14. 14.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  15. 15.🔍 Which is the odd one out? (a) a buzzer (b) a temperature sensor (c) a small display (d) an LED
  16. 16.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  17. 17.True or false: “many values in a range” is an analog signal. (a) True (b) False
  18. 18.Which of these is an output? (a) a temperature sensor (b) a motor (c) a sound sensor (d) a motion sensor
  19. 19.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  20. 20.🔍 Which is the odd one out? (a) a water pump (b) a small display (c) a servo motor (d) a light sensor
  21. 21.🔍 Which is the odd one out? (a) a keypad (b) a water pump (c) a push button (d) a motion sensor
  22. 22.📶 Digital or analog: many values in a range? (a) analog (b) digital
  23. 23.Which of these is an input? (a) a water pump (b) a speaker (c) a servo motor (d) a temperature sensor
  24. 24.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  25. 25.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  26. 26.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 1.5 V (d) 9 V
  27. 27.🔍 Which is the odd one out? (a) a servo motor (b) a speaker (c) a small display (d) a keypad
  28. 28.💡 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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.Which of these is an input? (a) a servo motor (b) a light sensor (c) a buzzer (d) an LED
  30. 30.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  31. 31.📶 Digital or analog: the room temperature? (a) analog (b) digital
  32. 32.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  34. 34.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  35. 35.💡 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
  36. 36.True or false: “the room temperature” is a digital signal. (a) True (b) False
  37. 37.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  38. 38.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  40. 40.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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