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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 258 · 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 input? (a) a keypad (b) a servo motor (c) an LED (d) a motor
  2. 2.📶 Digital or analog: the room temperature? (a) digital (b) analog
  3. 3.Which of these is an output? (a) a keypad (b) a motion sensor (c) a push button (d) a water pump
  4. 4.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    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) OFF (b) ON
  5. 5.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  7. 7.🔍 Which is the odd one out? (a) a keypad (b) a motor (c) a small display (d) an LED
  8. 8.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  9. 9.🔍 Which is the odd one out? (a) a small display (b) a temperature sensor (c) an LED (d) a buzzer
  10. 10.Which of these is an output? (a) a push button (b) a buzzer (c) a keypad (d) a temperature sensor
  11. 11.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  12. 12.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 5 V (d) 0 V
  13. 13.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  14. 14.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  15. 15.🔍 Which is the odd one out? (a) a light sensor (b) a motor (c) a push button (d) a motion sensor
  16. 16.True or false: “many values in a range” is an analog signal. (a) True (b) False
  17. 17.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  18. 18.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  19. 19.📶 How many states can a digital pin have? (a) a thousand (b) two (c) ten (d) one
  20. 20.💡 An LED (with its resistor) is on pin 8. 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) OFF (b) ON
  21. 21.🔍 Which is the odd one out? (a) a sound sensor (b) a temperature sensor (c) a motion sensor (d) a water pump
  22. 22.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 0 V (d) 50 V
  23. 23.💡 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
  24. 24.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  27. 27.True or false: “a tilt switch: on or off” 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.Which of these is an output? (a) a push button (b) a temperature sensor (c) a motor (d) a motion sensor
  30. 30.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  31. 31.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  32. 32.Which of these is an output? (a) a keypad (b) a motion sensor (c) a push button (d) a speaker
  33. 33.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  34. 34.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  35. 35.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  36. 36.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  37. 37.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.Which of these is an input? (a) a small display (b) an LED (c) a servo motor (d) a light sensor
  39. 39.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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