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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 282 · 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  3. 3.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 0 V (d) 9 V
  4. 4.💡 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
  5. 5.🔍 Which is the odd one out? (a) a push button (b) a speaker (c) a buzzer (d) an LED
  6. 6.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  8. 8.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  9. 9.🔍 Which is the odd one out? (a) a motion sensor (b) a water pump (c) a temperature sensor (d) a light sensor
  10. 10.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  11. 11.💡 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 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.Which of these is an input? (a) a small display (b) a buzzer (c) a temperature sensor (d) a motor
  13. 13.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) a sound sensor (d) a buzzer
  14. 14.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  15. 15.Which of these is an output? (a) a turning knob (b) a push button (c) an LED (d) a light sensor
  16. 16.True or false: “many values in a range” is a digital signal. (a) False (b) True
  17. 17.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  18. 18.📶 How many states can a digital pin have? (a) two (b) one (c) ten (d) a thousand
  19. 19.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  21. 21.🔍 Which is the odd one out? (a) a small display (b) a light sensor (c) a speaker (d) a servo motor
  22. 22.💡 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  25. 25.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  26. 26.Which of these is an output? (a) a push button (b) a turning knob (c) a small display (d) a keypad
  27. 27.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  28. 28.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.Which of these is an input? (a) an LED (b) a turning knob (c) a motor (d) a water pump
  31. 31.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  32. 32.💡 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 7 LOW
    set pin 7 HIGH
    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 7 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    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
  35. 35.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.Which of these is an input? (a) an LED (b) a motor (c) a servo motor (d) a sound sensor
  37. 37.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  38. 38.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  39. 39.🔍 Which is the odd one out? (a) a speaker (b) a sound sensor (c) a servo motor (d) an LED
  40. 40.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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