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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 697 · 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 keypad an input or an output for a microcontroller? (a) input (b) output
  2. 2.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  3. 3.🔍 Which is the odd one out? (a) a light sensor (b) a turning knob (c) a water pump (d) a motion sensor
  4. 4.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  5. 5.🔍 Which is the odd one out? (a) a sound sensor (b) a push button (c) a buzzer (d) a turning knob
  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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.Which of these is an output? (a) a small display (b) a sound sensor (c) a push button (d) a motion sensor
  9. 9.Which of these is an output? (a) a turning knob (b) a motion sensor (c) an LED (d) a light sensor
  10. 10.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  12. 12.📶 Digital or analog: the room temperature? (a) digital (b) analog
  13. 13.💡 An LED (with its resistor) is on pin 8. 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.Which of these is an input? (a) an LED (b) a small display (c) a buzzer (d) a push button
  15. 15.💡 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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  17. 17.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  18. 18.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  19. 19.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.💡 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
  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: “HIGH or LOW only” is an analog signal. (a) False (b) True
  23. 23.Which of these is an output? (a) a sound sensor (b) a keypad (c) a water pump (d) a push button
  24. 24.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  25. 25.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  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 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  28. 28.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an output (d) an input
  29. 29.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.True or false: “the room temperature” is a digital signal. (a) True (b) False
  31. 31.🔍 Which is the odd one out? (a) a temperature sensor (b) a speaker (c) an LED (d) a water pump
  32. 32.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) a speaker (d) a push button
  33. 33.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  35. 35.True or false: “many values in a range” is a digital signal. (a) False (b) True
  36. 36.🔍 Which is the odd one out? (a) a small display (b) a light sensor (c) a motion sensor (d) a temperature sensor
  37. 37.📶 How many states can a digital pin have? (a) a thousand (b) two (c) one (d) ten
  38. 38.Which of these is an input? (a) a small display (b) a servo motor (c) a water pump (d) a motion sensor
  39. 39.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.Which of these is an input? (a) a buzzer (b) a motor (c) a water pump (d) a light sensor

Answer key

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

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