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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 411 · 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.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 230 V (d) 5 V
  2. 2.💡 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 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.Which of these is an output? (a) a push button (b) a light sensor (c) a speaker (d) a temperature sensor
  4. 4.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  5. 5.🔍 Which is the odd one out? (a) a servo motor (b) a water pump (c) a temperature sensor (d) a buzzer
  6. 6.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  7. 7.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  8. 8.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.🔍 Which is the odd one out? (a) a buzzer (b) a small display (c) a sound sensor (d) a motor
  10. 10.Which of these is an input? (a) a motor (b) a small display (c) a servo motor (d) a sound sensor
  11. 11.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  12. 12.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  13. 13.💡 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
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  16. 16.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  17. 17.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  19. 19.Which of these is an input? (a) a light sensor (b) a buzzer (c) a motor (d) a water pump
  20. 20.💡 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
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.True or false: “many values in a range” is a digital signal. (a) True (b) False
  22. 22.💡 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
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.🔍 Which is the odd one out? (a) a motion sensor (b) a push button (c) a motor (d) a keypad
  24. 24.📶 A pin that reads a push button is set as … (a) an input (b) a resistor (c) an output (d) a battery
  25. 25.🔍 Which is the odd one out? (a) a buzzer (b) a turning knob (c) a water pump (d) a speaker
  26. 26.💡 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 8 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.📶 Digital or analog: the room temperature? (a) analog (b) digital
  28. 28.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  29. 29.Which of these is an input? (a) a turning knob (b) a motor (c) a buzzer (d) a servo motor
  30. 30.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  31. 31.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  32. 32.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  33. 33.🔍 Which is the odd one out? (a) a temperature sensor (b) a light sensor (c) a servo motor (d) a keypad
  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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 5 V (d) 9 V
  36. 36.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  38. 38.Which of these is an output? (a) a buzzer (b) a sound sensor (c) a temperature sensor (d) a light sensor
  39. 39.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  40. 40.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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