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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 712 · 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  3. 3.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  6. 6.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 1.5 V (d) 9 V
  7. 7.🔍 Which is the odd one out? (a) a turning knob (b) a push button (c) a light sensor (d) a small display
  8. 8.Which of these is an output? (a) a temperature sensor (b) a push button (c) a sound sensor (d) a water pump
  9. 9.Which of these is an output? (a) a push button (b) an LED (c) a light sensor (d) a motion sensor
  10. 10.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  11. 11.True or false: “the room temperature” is an analog signal. (a) True (b) False
  12. 12.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  13. 13.Which of these is an input? (a) a speaker (b) a push button (c) a servo motor (d) an LED
  14. 14.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  15. 15.💡 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) OFF (b) ON
  16. 16.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.💡 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) OFF (b) ON
  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 7 HIGH
    set pin 7 HIGH
    set pin 7 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 8 LOW
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  21. 21.Which of these is an output? (a) a motor (b) a light sensor (c) a turning knob (d) a temperature sensor
  22. 22.🔍 Which is the odd one out? (a) a light sensor (b) a servo motor (c) a motor (d) a speaker
  23. 23.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.📶 How many states can a digital pin have? (a) one (b) two (c) ten (d) a thousand
  26. 26.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  27. 27.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  28. 28.🔍 Which is the odd one out? (a) an LED (b) a water pump (c) a turning knob (d) a buzzer
  29. 29.💡 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 8 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  31. 31.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  32. 32.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  33. 33.Which of these is an output? (a) a motion sensor (b) a sound sensor (c) a small display (d) a push button
  34. 34.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  35. 35.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    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
  36. 36.Which of these is an output? (a) a buzzer (b) a turning knob (c) a sound sensor (d) a keypad
  37. 37.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.📶 Digital or analog: many values in a range? (a) digital (b) analog

Answer key

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

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