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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 238 · 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.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a battery (d) a resistor
  2. 2.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.🔍 Which is the odd one out? (a) a buzzer (b) a motion sensor (c) a motor (d) an LED
  4. 4.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  5. 5.Which of these is an output? (a) a turning knob (b) a speaker (c) a light sensor (d) a temperature sensor
  6. 6.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  7. 7.💡 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
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.💡 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) ON (b) OFF
  9. 9.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  10. 10.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 230 V (d) 5 V
  11. 11.Which of these is an input? (a) a small display (b) an LED (c) a servo motor (d) a push button
  12. 12.🔍 Which is the odd one out? (a) a motion sensor (b) a keypad (c) a sound sensor (d) a speaker
  13. 13.Which of these is an input? (a) a motion sensor (b) a speaker (c) an LED (d) a water pump
  14. 14.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  15. 15.Which of these is an input? (a) a servo motor (b) a buzzer (c) a temperature sensor (d) a water pump
  16. 16.💡 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 8 LOW
    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 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.Which of these is an output? (a) a turning knob (b) a light sensor (c) a servo motor (d) a push button
  19. 19.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  21. 21.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  22. 22.🔌 Is a small display 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 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.📶 Digital or analog: the room temperature? (a) analog (b) digital
  25. 25.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  26. 26.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  27. 27.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  28. 28.🔍 Which is the odd one out? (a) a turning knob (b) a buzzer (c) a speaker (d) a water pump
  29. 29.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) a light sensor (d) a buzzer
  30. 30.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  31. 31.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  32. 32.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  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 7 LOW
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  35. 35.💡 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
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  37. 37.🔍 Which is the odd one out? (a) a water pump (b) a light sensor (c) a turning knob (d) a sound sensor
  38. 38.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  39. 39.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  40. 40.🔍 Which is the odd one out? (a) a motor (b) a speaker (c) a buzzer (d) a sound sensor

Answer key

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

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