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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 424 · 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.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  2. 2.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 5 V (d) 0 V
  3. 3.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  5. 5.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) a motion sensor (d) a water pump
  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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.Which of these is an output? (a) a temperature sensor (b) a keypad (c) a motion sensor (d) a motor
  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
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.Which of these is an input? (a) a motor (b) a light sensor (c) a small display (d) an LED
  10. 10.💡 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 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  12. 12.🔍 Which is the odd one out? (a) a push button (b) a water pump (c) a small display (d) an LED
  13. 13.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  14. 14.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  15. 15.Which of these is an input? (a) an LED (b) a motion sensor (c) a water pump (d) a small display
  16. 16.💡 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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.Which of these is an output? (a) a temperature sensor (b) a servo motor (c) a motion sensor (d) a light sensor
  18. 18.💡 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
    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
  19. 19.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  20. 20.🔍 Which is the odd one out? (a) a servo motor (b) a sound sensor (c) an LED (d) a motor
  21. 21.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  22. 22.🔍 Which is the odd one out? (a) a servo motor (b) a motion sensor (c) an LED (d) a water pump
  23. 23.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  24. 24.🔍 Which is the odd one out? (a) a light sensor (b) a buzzer (c) a temperature sensor (d) a sound sensor
  25. 25.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  26. 26.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.📶 A pin that reads a push button is set as … (a) an input (b) a resistor (c) a battery (d) an output
  29. 29.🔍 Which is the odd one out? (a) a motor (b) a motion sensor (c) a sound sensor (d) a temperature sensor
  30. 30.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  31. 31.📶 How many states can a digital pin have? (a) one (b) ten (c) two (d) a thousand
  32. 32.📶 Digital or analog: many values in a range? (a) digital (b) analog
  33. 33.True or false: “many values in a range” is a digital signal. (a) True (b) False
  34. 34.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  35. 35.Which of these is an input? (a) an LED (b) a push button (c) a small display (d) a water pump
  36. 36.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  38. 38.Which of these is an output? (a) a keypad (b) a buzzer (c) a sound sensor (d) a temperature sensor
  39. 39.💡 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) OFF (b) ON
  40. 40.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True

Answer key

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

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