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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 218 · 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) 50 V (b) 230 V (c) 5 V (d) 0 V
  2. 2.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) one (d) two
  3. 3.🔍 Which is the odd one out? (a) a motion sensor (b) a temperature sensor (c) a speaker (d) a keypad
  4. 4.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  5. 5.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 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
  6. 6.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  7. 7.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  9. 9.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  10. 10.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.🔍 Which is the odd one out? (a) a temperature sensor (b) a buzzer (c) a motion sensor (d) a keypad
  12. 12.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  13. 13.🔍 Which is the odd one out? (a) a servo motor (b) a small display (c) a turning knob (d) a speaker
  14. 14.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  15. 15.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) an input (d) a resistor
  16. 16.Which of these is an input? (a) a speaker (b) a small display (c) a buzzer (d) a push button
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.Which of these is an output? (a) a turning knob (b) a motor (c) a temperature sensor (d) a sound sensor
  19. 19.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  20. 20.True or false: “many values in a range” is an analog signal. (a) False (b) True
  21. 21.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  23. 23.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  25. 25.Which of these is an input? (a) a small display (b) a buzzer (c) a sound sensor (d) an LED
  26. 26.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) a light sensor (d) a water pump
  27. 27.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.🔍 Which is the odd one out? (a) a speaker (b) an LED (c) a buzzer (d) a keypad
  29. 29.Which of these is an input? (a) a speaker (b) a servo motor (c) a motion sensor (d) a motor
  30. 30.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  31. 31.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    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
  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 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
  33. 33.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  34. 34.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  35. 35.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  37. 37.💡 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) ON (b) OFF
  38. 38.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  40. 40.Which of these is an output? (a) a water pump (b) a motion sensor (c) a push button (d) a sound sensor

Answer key

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

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