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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 785 · 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.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.🔍 Which is the odd one out? (a) a light sensor (b) a speaker (c) a motor (d) a small display
  3. 3.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) a push button (d) an LED
  4. 4.🔍 Which is the odd one out? (a) a keypad (b) a push button (c) a water pump (d) a sound sensor
  5. 5.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  6. 6.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  7. 7.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  8. 8.📶 How many states can a digital pin have? (a) two (b) one (c) a thousand (d) ten
  9. 9.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  10. 10.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  11. 11.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  12. 12.📶 A pin set LOW gives about … (a) 0 V (b) 9 V (c) 1.5 V (d) 5 V
  13. 13.Which of these is an output? (a) a temperature sensor (b) a push button (c) a small display (d) a sound sensor
  14. 14.Which of these is an input? (a) a buzzer (b) a water pump (c) a motor (d) a turning knob
  15. 15.Which of these is an input? (a) a motor (b) a water pump (c) a light sensor (d) a small display
  16. 16.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) a resistor (d) an output
  17. 17.Which of these is an output? (a) a motion sensor (b) a water pump (c) a temperature 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 7 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
  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 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  21. 21.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  22. 22.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 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 motion sensor (c) an LED (d) a push button
  24. 24.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  25. 25.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 230 V (d) 50 V
  26. 26.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  27. 27.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  28. 28.💡 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) OFF (b) ON
  29. 29.Which of these is an input? (a) a speaker (b) an LED (c) a small display (d) a keypad
  30. 30.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.True or false: “many values in a range” is an analog signal. (a) False (b) True
  34. 34.Which of these is an output? (a) a motion sensor (b) a speaker (c) a light sensor (d) a keypad
  35. 35.🔍 Which is the odd one out? (a) a sound sensor (b) a small display (c) a turning knob (d) a push button
  36. 36.Which of these is an output? (a) a push button (b) a buzzer (c) a keypad (d) a motion sensor
  37. 37.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  38. 38.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  39. 39.Which of these is an input? (a) a speaker (b) an LED (c) a motor (d) a sound sensor
  40. 40.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output

Answer key

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

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