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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 417 · 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 keypad (b) a motor (c) a push button (d) a light sensor
  2. 2.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  3. 3.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  4. 4.🔍 Which is the odd one out? (a) a keypad (b) a motor (c) a small display (d) an LED
  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 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.🔍 Which is the odd one out? (a) a temperature sensor (b) a push button (c) a turning knob (d) a small display
  7. 7.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  8. 8.Which of these is an output? (a) a turning knob (b) a sound sensor (c) a light sensor (d) a speaker
  9. 9.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.🔍 Which is the odd one out? (a) a motor (b) a buzzer (c) a push button (d) a speaker
  11. 11.💡 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
  12. 12.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  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.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  15. 15.📶 How many states can a digital pin have? (a) two (b) ten (c) one (d) a thousand
  16. 16.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 0 V (d) 50 V
  17. 17.Which of these is an output? (a) a light sensor (b) a turning knob (c) a temperature sensor (d) a servo motor
  18. 18.Which of these is an input? (a) a servo motor (b) a buzzer (c) an LED (d) a temperature sensor
  19. 19.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  21. 21.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.🔍 Which is the odd one out? (a) a motor (b) a light sensor (c) a buzzer (d) a water pump
  23. 23.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  24. 24.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 9 V (d) 0 V
  25. 25.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    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
  26. 26.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  27. 27.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  29. 29.True or false: “the room temperature” is an analog signal. (a) True (b) False
  30. 30.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  31. 31.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.📶 Digital or analog: many values in a range? (a) analog (b) digital
  33. 33.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  34. 34.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  35. 35.🔍 Which is the odd one out? (a) a turning knob (b) a sound sensor (c) a buzzer (d) a motion sensor
  36. 36.Which of these is an input? (a) an LED (b) a turning knob (c) a servo motor (d) a water pump
  37. 37.🔍 Which is the odd one out? (a) a temperature sensor (b) a push button (c) a light sensor (d) a speaker
  38. 38.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  39. 39.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  40. 40.Which of these is an input? (a) a buzzer (b) a light sensor (c) a servo motor (d) an LED

Answer key

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

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