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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 675 · 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 sound sensor (b) a push button (c) a turning knob (d) a motor
  2. 2.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  4. 4.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  6. 6.💡 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 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 230 V (d) 0 V
  8. 8.🔍 Which is the odd one out? (a) a buzzer (b) a servo motor (c) a water pump (d) a turning knob
  9. 9.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  11. 11.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  12. 12.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  13. 13.📶 How many states can a digital pin have? (a) a thousand (b) one (c) ten (d) two
  14. 14.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.🔍 Which is the odd one out? (a) a sound sensor (b) a light sensor (c) an LED (d) a temperature sensor
  16. 16.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.🔍 Which is the odd one out? (a) a water pump (b) a sound sensor (c) a motion sensor (d) a light sensor
  18. 18.Which of these is an output? (a) a buzzer (b) a push button (c) a keypad (d) a temperature sensor
  19. 19.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  20. 20.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.🔍 Which is the odd one out? (a) an LED (b) a servo motor (c) a speaker (d) a motion sensor
  23. 23.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  24. 24.Which of these is an output? (a) a temperature sensor (b) a speaker (c) a keypad (d) a motion sensor
  25. 25.🔍 Which is the odd one out? (a) a keypad (b) a light sensor (c) a speaker (d) a motion sensor
  26. 26.Which of these is an input? (a) a sound sensor (b) a motor (c) a water pump (d) a buzzer
  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 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.Which of these is an input? (a) a motion sensor (b) a motor (c) a speaker (d) an LED
  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 HIGH
    set pin 7 LOW
    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 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 0 V (d) 1.5 V
  34. 34.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  35. 35.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  36. 36.🔍 Which is the odd one out? (a) a sound sensor (b) a water pump (c) an LED (d) a motor
  37. 37.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  38. 38.Which of these is an output? (a) a light sensor (b) a turning knob (c) a motor (d) a motion sensor
  39. 39.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  40. 40.🔍 Which is the odd one out? (a) a keypad (b) a motor (c) an LED (d) a speaker

Answer key

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

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