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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 890 · 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.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  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 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.Which of these is an input? (a) a temperature sensor (b) a water pump (c) a small display (d) an LED
  4. 4.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  5. 5.💡 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
  6. 6.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  7. 7.🔍 Which is the odd one out? (a) a buzzer (b) a water pump (c) a servo motor (d) a push button
  8. 8.🔍 Which is the odd one out? (a) a speaker (b) a light sensor (c) a buzzer (d) a motor
  9. 9.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  10. 10.📶 How many states can a digital pin have? (a) one (b) ten (c) two (d) a thousand
  11. 11.Which of these is an input? (a) a small display (b) a buzzer (c) a motor (d) a keypad
  12. 12.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.Which of these is an input? (a) an LED (b) a buzzer (c) a motion sensor (d) a speaker
  14. 14.🔍 Which is the odd one out? (a) a buzzer (b) a small display (c) a sound sensor (d) an LED
  15. 15.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.Which of these is an input? (a) a turning knob (b) a motor (c) an LED (d) a buzzer
  17. 17.💡 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
  18. 18.📶 Digital or analog: many values in a range? (a) digital (b) analog
  19. 19.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  20. 20.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 9 V (d) 0 V
  22. 22.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  23. 23.💡 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
  24. 24.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 5 V (d) 0 V
  25. 25.🔍 Which is the odd one out? (a) a motion sensor (b) a temperature sensor (c) a buzzer (d) a turning knob
  26. 26.🔍 Which is the odd one out? (a) an LED (b) a light sensor (c) a motion sensor (d) a sound sensor
  27. 27.Which of these is an output? (a) a temperature sensor (b) a sound sensor (c) a turning knob (d) an LED
  28. 28.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  31. 31.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  32. 32.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  33. 33.💡 An LED (with its resistor) is on pin 7. 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
  34. 34.Which of these is an output? (a) a sound sensor (b) a light sensor (c) a small display (d) a temperature sensor
  35. 35.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  36. 36.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  37. 37.True or false: “how bright a room is” is an analog 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 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.Which of these is an output? (a) a motion sensor (b) a temperature sensor (c) a push button (d) a water pump
  40. 40.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False

Answer key

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

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