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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 714 · 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 motor an input or an output for a microcontroller? (a) input (b) output
  2. 2.📶 How many states can a digital pin have? (a) one (b) a thousand (c) ten (d) two
  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 7 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.🔍 Which is the odd one out? (a) a small display (b) a servo motor (c) a motion sensor (d) an LED
  5. 5.🔍 Which is the odd one out? (a) a temperature sensor (b) a motion sensor (c) a push button (d) a small display
  6. 6.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) an output (d) a resistor
  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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  9. 9.📶 Digital or analog: many values in a range? (a) digital (b) analog
  10. 10.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  11. 11.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  12. 12.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 1.5 V (d) 0 V
  14. 14.Which of these is an input? (a) an LED (b) a water pump (c) a motor (d) a keypad
  15. 15.Which of these is an input? (a) a servo motor (b) a speaker (c) a light sensor (d) a small display
  16. 16.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  17. 17.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  18. 18.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a motion sensor (d) a turning knob
  19. 19.Which of these is an output? (a) a buzzer (b) a light sensor (c) a push button (d) a motion sensor
  20. 20.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  21. 21.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 0 V (d) 5 V
  22. 22.True or false: “the room temperature” is an analog signal. (a) False (b) True
  23. 23.💡 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
    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 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  26. 26.💡 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 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  28. 28.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  29. 29.🔍 Which is the odd one out? (a) an LED (b) a keypad (c) a push button (d) a temperature sensor
  30. 30.📶 Digital or analog: the room temperature? (a) digital (b) analog
  31. 31.💡 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
  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 LOW
    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
  33. 33.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  34. 34.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.Which of these is an input? (a) a small display (b) an LED (c) a sound sensor (d) a buzzer
  36. 36.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  37. 37.📶 Digital or analog: a tilt switch: on or off? (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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔍 Which is the odd one out? (a) a turning knob (b) a buzzer (c) an LED (d) a water pump
  40. 40.Which of these is an output? (a) a motion sensor (b) a servo motor (c) a sound sensor (d) a push button

Answer key

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

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