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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 56 · 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 push button an input or an output for a microcontroller? (a) input (b) output
  2. 2.Which of these is an input? (a) a water pump (b) a small display (c) a temperature sensor (d) a motor
  3. 3.📶 How many states can a digital pin have? (a) one (b) two (c) ten (d) a thousand
  4. 4.🔍 Which is the odd one out? (a) an LED (b) a light sensor (c) a buzzer (d) a motor
  5. 5.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    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
  6. 6.💡 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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  8. 8.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  9. 9.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 8 HIGH
    set pin 7 HIGH
    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 small display (b) a water pump (c) a buzzer (d) a motion sensor
  12. 12.💡 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 7 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) an input (d) a resistor
  14. 14.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  15. 15.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  17. 17.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  18. 18.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  19. 19.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 0 V (d) 5 V
  20. 20.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  21. 21.🔍 Which is the odd one out? (a) a motion sensor (b) a temperature sensor (c) a servo motor (d) a keypad
  22. 22.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  23. 23.Which of these is an input? (a) a servo motor (b) a buzzer (c) a water pump (d) a light sensor
  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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.Which of these is an output? (a) a turning knob (b) a temperature sensor (c) an LED (d) a motion sensor
  26. 26.💡 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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  29. 29.🔍 Which is the odd one out? (a) an LED (b) a push button (c) a light sensor (d) a keypad
  30. 30.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 230 V (d) 5 V
  31. 31.🔍 Which is the odd one out? (a) a small display (b) a keypad (c) a speaker (d) a buzzer
  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 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  34. 34.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  35. 35.Which of these is an input? (a) a water pump (b) a motion sensor (c) a small display (d) a motor
  36. 36.📶 Digital or analog: many values in a range? (a) analog (b) digital
  37. 37.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  38. 38.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  39. 39.Which of these is an input? (a) an LED (b) a servo motor (c) a water pump (d) a keypad
  40. 40.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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