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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 90 · 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 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  4. 4.💡 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
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.Which of these is an output? (a) a temperature sensor (b) a push button (c) a speaker (d) a motion sensor
  6. 6.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 50 V (d) 0 V
  7. 7.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.💡 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) OFF (b) ON
  9. 9.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  10. 10.🔍 Which is the odd one out? (a) an LED (b) a water pump (c) a light sensor (d) a speaker
  11. 11.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  12. 12.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  13. 13.📶 How many states can a digital pin have? (a) one (b) two (c) a thousand (d) ten
  14. 14.Which of these is an output? (a) a push button (b) a keypad (c) a light sensor (d) a water pump
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.Which of these is an input? (a) a temperature sensor (b) a buzzer (c) a small display (d) a water pump
  17. 17.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  18. 18.💡 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) ON (b) OFF
  19. 19.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  20. 20.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  21. 21.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  22. 22.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  23. 23.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  24. 24.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  25. 25.💡 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) OFF (b) ON
  26. 26.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.🔍 Which is the odd one out? (a) a temperature sensor (b) a light sensor (c) a buzzer (d) a turning knob
  29. 29.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a motion sensor (d) a temperature sensor
  30. 30.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.💡 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
  32. 32.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    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 7 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.Which of these is an output? (a) a temperature sensor (b) a turning knob (c) a motion sensor (d) a buzzer
  36. 36.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  37. 37.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  38. 38.Which of these is an output? (a) a light sensor (b) a motion sensor (c) a push button (d) a servo motor
  39. 39.🔍 Which is the odd one out? (a) a motor (b) a speaker (c) a water pump (d) a sound sensor
  40. 40.💡 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) OFF (b) ON

Answer key

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

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