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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 862 · 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.Which of these is an input? (a) a water pump (b) a small display (c) an LED (d) a turning knob
  3. 3.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  4. 4.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  5. 5.Which of these is an input? (a) a servo motor (b) a water pump (c) a sound sensor (d) a speaker
  6. 6.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  7. 7.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  8. 8.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  9. 9.Which of these is an output? (a) a motion sensor (b) an LED (c) a temperature sensor (d) a sound sensor
  10. 10.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  11. 11.🔍 Which is the odd one out? (a) a motor (b) a buzzer (c) a water pump (d) a light sensor
  12. 12.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  13. 13.Which of these is an output? (a) a push button (b) a keypad (c) a temperature sensor (d) a motor
  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 7. 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
  16. 16.🔍 Which is the odd one out? (a) a temperature sensor (b) a sound sensor (c) a motion sensor (d) an LED
  17. 17.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  18. 18.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  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 7 HIGH
    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
  20. 20.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  21. 21.💡 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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.💡 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) OFF (b) ON
  23. 23.Which of these is an input? (a) a water pump (b) a speaker (c) an LED (d) a light sensor
  24. 24.Which of these is an input? (a) an LED (b) a water pump (c) a small display (d) a temperature sensor
  25. 25.🔍 Which is the odd one out? (a) a motor (b) a speaker (c) a temperature sensor (d) a small display
  26. 26.True or false: “many values in a range” is an analog signal. (a) False (b) True
  27. 27.🔍 Which is the odd one out? (a) a temperature sensor (b) a light sensor (c) a motor (d) a push button
  28. 28.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 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
  29. 29.Which of these is an input? (a) an LED (b) a water pump (c) a speaker (d) a motion sensor
  30. 30.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  32. 32.📶 Digital or analog: many values in a range? (a) analog (b) digital
  33. 33.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  36. 36.💡 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
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.📶 Digital or analog: the room temperature? (a) digital (b) analog
  40. 40.True or false: “the room temperature” is a digital signal. (a) False (b) True

Answer key

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

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