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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 811 · 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 sound sensor an input or an output for a microcontroller? (a) input (b) output
  2. 2.Which of these is an input? (a) a speaker (b) a water pump (c) a sound sensor (d) a buzzer
  3. 3.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  4. 4.💡 An LED (with its resistor) is on pin 7. 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) ON (b) OFF
  5. 5.Which of these is an output? (a) a motor (b) a temperature sensor (c) a push button (d) a sound sensor
  6. 6.Which of these is an input? (a) a temperature sensor (b) a speaker (c) a motor (d) a small display
  7. 7.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 230 V (d) 50 V
  8. 8.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  10. 10.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a motion sensor (d) a temperature sensor
  11. 11.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    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
  12. 12.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  13. 13.Which of these is an output? (a) a turning knob (b) a keypad (c) a light sensor (d) a water pump
  14. 14.Which of these is an output? (a) a servo motor (b) a light sensor (c) a sound sensor (d) a temperature sensor
  15. 15.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  16. 16.🔍 Which is the odd one out? (a) a turning knob (b) a push button (c) a keypad (d) an LED
  17. 17.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  19. 19.💡 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
  20. 20.🔍 Which is the odd one out? (a) a keypad (b) a motion sensor (c) a servo motor (d) a push button
  21. 21.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  22. 22.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  23. 23.💡 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 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.🔍 Which is the odd one out? (a) a servo motor (b) a buzzer (c) a sound sensor (d) a motor
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.Which of these is an output? (a) a temperature sensor (b) a motion sensor (c) a push button (d) a small display
  27. 27.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  28. 28.True or false: “many values in a range” is an analog signal. (a) True (b) False
  29. 29.📶 How many states can a digital pin have? (a) ten (b) two (c) a thousand (d) one
  30. 30.Which of these is an output? (a) a sound sensor (b) a push button (c) a buzzer (d) a temperature sensor
  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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.Which of these is an input? (a) a speaker (b) a motor (c) a buzzer (d) a light sensor
  33. 33.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  34. 34.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  36. 36.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  37. 37.📶 Digital or analog: many values in a range? (a) analog (b) digital
  38. 38.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  39. 39.🔌 Is a push button 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. input
  2. a sound sensor
  3. analog
  4. ON
  5. a motor
  6. a temperature sensor
  7. 5 V
  8. OFF
  9. input
  10. a water pump
  11. OFF
  12. output
  13. a water pump
  14. a servo motor
  15. True
  16. an LED
  17. ON
  18. False
  19. OFF
  20. a servo motor
  21. analog
  22. input
  23. OFF
  24. a sound sensor
  25. OFF
  26. a small display
  27. output
  28. True
  29. two
  30. a buzzer
  31. OFF
  32. a light sensor
  33. analog
  34. OFF
  35. digital
  36. output
  37. analog
  38. digital
  39. input
  40. ON

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