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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 481 · 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.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) an LED (d) a sound sensor
  2. 2.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  3. 3.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  4. 4.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) an input (d) a battery
  5. 5.Which of these is an input? (a) a servo motor (b) a motor (c) a push button (d) a speaker
  6. 6.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  7. 7.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 0 V (d) 50 V
  8. 8.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 9 V (d) 1.5 V
  9. 9.💡 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
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  11. 11.🔍 Which is the odd one out? (a) a water pump (b) a small display (c) an LED (d) a sound sensor
  12. 12.True or false: “the room temperature” is a digital signal. (a) True (b) False
  13. 13.🔍 Which is the odd one out? (a) a buzzer (b) a push button (c) a motion sensor (d) a light sensor
  14. 14.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.💡 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) OFF (b) ON
  16. 16.📶 Digital or analog: the room temperature? (a) digital (b) analog
  17. 17.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.True or false: “the room temperature” is an analog signal. (a) False (b) True
  19. 19.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  20. 20.Which of these is an input? (a) a speaker (b) a servo motor (c) a motion sensor (d) a water pump
  21. 21.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  22. 22.Which of these is an output? (a) a keypad (b) a buzzer (c) a temperature sensor (d) a push button
  23. 23.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  24. 24.True or false: “many values in a range” is a digital signal. (a) True (b) False
  25. 25.Which of these is an input? (a) a motor (b) a water pump (c) a small display (d) a light sensor
  26. 26.🔍 Which is the odd one out? (a) a small display (b) a motor (c) a turning knob (d) a buzzer
  27. 27.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  30. 30.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  31. 31.💡 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
  32. 32.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  36. 36.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) a motor (d) a motion sensor
  37. 37.Which of these is an output? (a) a temperature sensor (b) a turning knob (c) a light sensor (d) a speaker
  38. 38.Which of these is an output? (a) a turning knob (b) a small display (c) a keypad (d) a push button
  39. 39.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  40. 40.💡 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) OFF (b) ON

Answer key

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

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