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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 405 · 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 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.Which of these is an output? (a) a keypad (b) an LED (c) a turning knob (d) a push button
  3. 3.💡 An LED (with its resistor) is on pin 7. 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
  4. 4.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  5. 5.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  6. 6.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 5 V (d) 9 V
  7. 7.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  8. 8.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  9. 9.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  10. 10.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  11. 11.🔍 Which is the odd one out? (a) a sound sensor (b) a push button (c) a turning knob (d) a small display
  12. 12.🔍 Which is the odd one out? (a) a servo motor (b) a buzzer (c) a water pump (d) a sound sensor
  13. 13.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.Which of these is an output? (a) a servo motor (b) a push button (c) a sound sensor (d) a keypad
  15. 15.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  18. 18.💡 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) OFF (b) ON
  19. 19.💡 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) OFF (b) ON
  20. 20.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.🔍 Which is the odd one out? (a) a keypad (b) a push button (c) a servo motor (d) a light sensor
  22. 22.📶 Digital or analog: many values in a range? (a) analog (b) digital
  23. 23.💡 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) ON (b) OFF
  24. 24.💡 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
    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 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.🔍 Which is the odd one out? (a) a sound sensor (b) a turning knob (c) an LED (d) a motion sensor
  27. 27.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 0 V (d) 50 V
  28. 28.🔍 Which is the odd one out? (a) an LED (b) a motor (c) a temperature sensor (d) a buzzer
  29. 29.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.Which of these is an input? (a) an LED (b) a small display (c) a push button (d) a speaker
  31. 31.💡 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 8 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 8 LOW
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  34. 34.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  35. 35.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  36. 36.🔍 Which is the odd one out? (a) a sound sensor (b) a light sensor (c) a motion sensor (d) a motor
  37. 37.📶 How many states can a digital pin have? (a) two (b) ten (c) a thousand (d) one
  38. 38.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  39. 39.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  40. 40.Which of these is an input? (a) a small display (b) a buzzer (c) a speaker (d) a turning knob

Answer key

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

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