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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 775 · 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 9 V (d) 1.5 V
  3. 3.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  4. 4.Which of these is an input? (a) a motor (b) a water pump (c) an LED (d) a push button
  5. 5.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  6. 6.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  7. 7.📶 How many states can a digital pin have? (a) a thousand (b) one (c) two (d) ten
  8. 8.True or false: “the room temperature” is an analog signal. (a) False (b) True
  9. 9.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  10. 10.Which of these is an output? (a) a keypad (b) a servo motor (c) a push button (d) a temperature sensor
  11. 11.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  12. 12.📶 Digital or analog: many values in a range? (a) digital (b) analog
  13. 13.💡 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 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  15. 15.🔍 Which is the odd one out? (a) a temperature sensor (b) a push button (c) a turning knob (d) a servo motor
  16. 16.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  17. 17.🔍 Which is the odd one out? (a) a small display (b) a speaker (c) a buzzer (d) a light sensor
  18. 18.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  19. 19.🔍 Which is the odd one out? (a) a light sensor (b) a keypad (c) a sound sensor (d) an LED
  20. 20.🔍 Which is the odd one out? (a) a keypad (b) a motor (c) a speaker (d) an LED
  21. 21.🔍 Which is the odd one out? (a) a temperature sensor (b) a buzzer (c) a water pump (d) a small display
  22. 22.💡 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 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.💡 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
  25. 25.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    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
  26. 26.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.True or false: “the room temperature” is a digital signal. (a) True (b) False
  29. 29.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  30. 30.Which of these is an input? (a) a motor (b) a light sensor (c) an LED (d) a servo motor
  31. 31.🔍 Which is the odd one out? (a) a light sensor (b) a turning knob (c) a motor (d) a keypad
  32. 32.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  33. 33.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  34. 34.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  35. 35.Which of these is an output? (a) a buzzer (b) a motion sensor (c) a keypad (d) a light sensor
  36. 36.Which of these is an input? (a) a water pump (b) a servo motor (c) a sound sensor (d) an LED
  37. 37.💡 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 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  39. 39.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  40. 40.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output

Answer key

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

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