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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 388 · 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) input (b) output
  2. 2.🔍 Which is the odd one out? (a) a light sensor (b) a motor (c) a water pump (d) a small display
  3. 3.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 9 V (d) 1.5 V
  5. 5.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    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) OFF (b) ON
  6. 6.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  7. 7.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  9. 9.True or false: “the room temperature” is an analog signal. (a) False (b) True
  10. 10.💡 An LED (with its resistor) is on pin 8. 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) OFF (b) ON
  11. 11.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 50 V (d) 0 V
  12. 12.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  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 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
  14. 14.💡 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) ON (b) OFF
  15. 15.Which of these is an input? (a) a small display (b) a temperature sensor (c) a servo motor (d) a water pump
  16. 16.Which of these is an output? (a) a temperature sensor (b) a turning knob (c) a motion sensor (d) a speaker
  17. 17.💡 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
    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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  21. 21.Which of these is an input? (a) an LED (b) a small display (c) a motor (d) a light sensor
  22. 22.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.Which of these is an input? (a) a small display (b) a speaker (c) a buzzer (d) a sound sensor
  24. 24.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  25. 25.🔍 Which is the odd one out? (a) a turning knob (b) a keypad (c) a motion sensor (d) a buzzer
  26. 26.🔍 Which is the odd one out? (a) a push button (b) a small display (c) an LED (d) a water pump
  27. 27.Which of these is an output? (a) a temperature sensor (b) a push button (c) an LED (d) a keypad
  28. 28.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  29. 29.🔍 Which is the odd one out? (a) an LED (b) a small display (c) a servo motor (d) a turning knob
  30. 30.💡 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 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  32. 32.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  33. 33.Which of these is an output? (a) a keypad (b) a light sensor (c) a push button (d) a small display
  34. 34.🔍 Which is the odd one out? (a) a buzzer (b) a keypad (c) a water pump (d) a motor
  35. 35.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) a turning knob (d) a motor
  36. 36.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  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 buzzer (b) a temperature sensor (c) a push button (d) a light sensor
  39. 39.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.Which of these is an output? (a) a keypad (b) a servo motor (c) a light sensor (d) a push button

Answer key

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

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