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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 985 · 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 buzzer an input or an output for a microcontroller? (a) input (b) output
  2. 2.Which of these is an output? (a) an LED (b) a light sensor (c) a keypad (d) a turning knob
  3. 3.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  4. 4.💡 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 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.🔍 Which is the odd one out? (a) a speaker (b) a servo motor (c) a buzzer (d) a sound sensor
  6. 6.💡 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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 9 V (d) 5 V
  8. 8.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  9. 9.Which of these is an output? (a) a push button (b) a temperature sensor (c) a servo motor (d) a keypad
  10. 10.True or false: “many values in a range” is a digital signal. (a) False (b) True
  11. 11.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  12. 12.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  13. 13.🔍 Which is the odd one out? (a) a push button (b) a light sensor (c) a motion sensor (d) a servo motor
  14. 14.Which of these is an output? (a) a buzzer (b) a keypad (c) a push button (d) a sound sensor
  15. 15.💡 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) OFF (b) ON
  16. 16.🔍 Which is the odd one out? (a) a servo motor (b) a motor (c) a motion sensor (d) a buzzer
  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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.🔍 Which is the odd one out? (a) a light sensor (b) a small display (c) an LED (d) a servo motor
  19. 19.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  20. 20.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  21. 21.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.📶 Digital or analog: many values in a range? (a) digital (b) analog
  24. 24.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  25. 25.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  26. 26.🔍 Which is the odd one out? (a) a push button (b) a light sensor (c) an LED (d) a turning knob
  27. 27.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  28. 28.🔍 Which is the odd one out? (a) a temperature sensor (b) a motor (c) a keypad (d) a light sensor
  29. 29.💡 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 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  31. 31.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 50 V (d) 5 V
  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 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.Which of these is an input? (a) a speaker (b) a motor (c) a servo motor (d) a light sensor
  34. 34.🔍 Which is the odd one out? (a) a motion sensor (b) a push button (c) a turning knob (d) a water pump
  35. 35.💡 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 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.🔍 Which is the odd one out? (a) a keypad (b) a buzzer (c) a push button (d) a sound sensor
  38. 38.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  40. 40.Which of these is an input? (a) a turning knob (b) a servo motor (c) a buzzer (d) a small display

Answer key

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

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