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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 489 · 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.🔍 Which is the odd one out? (a) a motor (b) a turning knob (c) an LED (d) a buzzer
  2. 2.Which of these is an output? (a) a sound sensor (b) a motor (c) a light sensor (d) a temperature sensor
  3. 3.📶 A pin that reads a push button is set as … (a) an input (b) a resistor (c) a battery (d) an output
  4. 4.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  5. 5.🔍 Which is the odd one out? (a) a motor (b) a push button (c) a buzzer (d) a servo motor
  6. 6.🔍 Which is the odd one out? (a) an LED (b) a small display (c) a motor (d) a keypad
  7. 7.💡 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
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) two (d) one
  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) a light sensor (b) an LED (c) a water pump (d) a buzzer
  11. 11.🔍 Which is the odd one out? (a) a motion sensor (b) a turning knob (c) a buzzer (d) a keypad
  12. 12.Which of these is an input? (a) a small display (b) an LED (c) a turning knob (d) a water pump
  13. 13.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  15. 15.True or false: “the room temperature” is a digital signal. (a) False (b) True
  16. 16.💡 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) OFF (b) ON
  17. 17.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 5 V (d) 50 V
  18. 18.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  19. 19.Which of these is an input? (a) a motor (b) an LED (c) a water pump (d) a sound sensor
  20. 20.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 9 V (d) 1.5 V
  21. 21.True or false: “a tilt switch: on or off” is an analog 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 HIGH
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.Which of these is an output? (a) a sound sensor (b) a keypad (c) a light sensor (d) a small display
  24. 24.💡 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) ON (b) OFF
  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 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  27. 27.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  28. 28.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.💡 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
    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
  30. 30.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  32. 32.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  33. 33.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  34. 34.💡 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 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    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 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.Which of these is an output? (a) a push button (b) a sound sensor (c) a speaker (d) a temperature sensor
  37. 37.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  40. 40.🔍 Which is the odd one out? (a) a turning knob (b) a motion sensor (c) a light sensor (d) a water pump

Answer key

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

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