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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 721 · 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  4. 4.Which of these is an output? (a) a turning knob (b) a water pump (c) a push button (d) a sound sensor
  5. 5.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.💡 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
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  9. 9.Which of these is an input? (a) a servo motor (b) a speaker (c) a water pump (d) a sound sensor
  10. 10.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.Which of these is an input? (a) a buzzer (b) a keypad (c) an LED (d) a small display
  12. 12.📶 How many states can a digital pin have? (a) two (b) one (c) ten (d) a thousand
  13. 13.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 230 V (d) 0 V
  14. 14.Which of these is an output? (a) a push button (b) a motor (c) a motion sensor (d) a light sensor
  15. 15.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.Which of these is an input? (a) a water pump (b) a speaker (c) a turning knob (d) a small display
  17. 17.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  18. 18.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  19. 19.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  20. 20.🔍 Which is the odd one out? (a) a motor (b) a light sensor (c) a small display (d) a buzzer
  21. 21.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.Which of these is an output? (a) a turning knob (b) a sound sensor (c) a speaker (d) a light sensor
  23. 23.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  24. 24.💡 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
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.🔍 Which is the odd one out? (a) a turning knob (b) a motion sensor (c) a light sensor (d) a motor
  26. 26.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) an input (d) a resistor
  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 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.🔍 Which is the odd one out? (a) a water pump (b) a servo motor (c) a speaker (d) a temperature sensor
  29. 29.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.🔍 Which is the odd one out? (a) an LED (b) a push button (c) a keypad (d) a motion sensor
  32. 32.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  33. 33.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  35. 35.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  36. 36.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  38. 38.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    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
  39. 39.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  40. 40.True or false: “the room temperature” is an analog signal. (a) True (b) False

Answer key

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

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