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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 67 · 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 7 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  3. 3.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.🔍 Which is the odd one out? (a) a motion sensor (b) a water pump (c) a motor (d) a small display
  5. 5.Which of these is an output? (a) a servo motor (b) a push button (c) a light sensor (d) a turning knob
  6. 6.Which of these is an input? (a) a servo motor (b) a turning knob (c) a buzzer (d) a water pump
  7. 7.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  8. 8.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  9. 9.True or false: “many values in a range” is a digital signal. (a) False (b) True
  10. 10.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.🔍 Which is the odd one out? (a) a small display (b) a speaker (c) a light sensor (d) a buzzer
  12. 12.🔍 Which is the odd one out? (a) a temperature sensor (b) a turning knob (c) a buzzer (d) a keypad
  13. 13.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  14. 14.Which of these is an output? (a) a sound sensor (b) an LED (c) a motion sensor (d) a push button
  15. 15.🔍 Which is the odd one out? (a) a small display (b) an LED (c) a motor (d) a turning knob
  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 8 LOW
    set pin 7 HIGH
    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) 5 V (b) 0 V (c) 50 V (d) 230 V
  18. 18.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  19. 19.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  20. 20.🔍 Which is the odd one out? (a) a motion sensor (b) a keypad (c) a push button (d) a small display
  21. 21.Which of these is an input? (a) a speaker (b) a buzzer (c) a light sensor (d) a small display
  22. 22.🔍 Which is the odd one out? (a) a push button (b) a speaker (c) a sound sensor (d) a motion sensor
  23. 23.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  24. 24.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  26. 26.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 0 V (d) 5 V
  29. 29.🔍 Which is the odd one out? (a) a buzzer (b) a small display (c) a water pump (d) a push button
  30. 30.💡 An LED (with its resistor) is on pin 7. 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
  31. 31.💡 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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  33. 33.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.True or false: “many values in a range” is an analog signal. (a) True (b) False
  36. 36.True or false: “the room temperature” is a digital signal. (a) True (b) False
  37. 37.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  38. 38.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.📶 Digital or analog: a knob turned part way? (a) digital (b) analog

Answer key

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

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