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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 491 · 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) 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 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  4. 4.Which of these is an output? (a) a servo motor (b) a push button (c) a sound sensor (d) a keypad
  5. 5.📶 Digital or analog: many values in a range? (a) analog (b) digital
  6. 6.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  7. 7.True or false: “the room temperature” is an analog signal. (a) False (b) True
  8. 8.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  9. 9.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 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
  10. 10.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  11. 11.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  12. 12.🔍 Which is the odd one out? (a) a water pump (b) a speaker (c) a push button (d) a buzzer
  13. 13.💡 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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.Which of these is an input? (a) a buzzer (b) a motion sensor (c) a servo motor (d) a water pump
  15. 15.💡 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 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  17. 17.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  18. 18.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 50 V (d) 5 V
  19. 19.🔍 Which is the odd one out? (a) a turning knob (b) a light sensor (c) a buzzer (d) a push button
  20. 20.💡 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) OFF (b) ON
  21. 21.🔍 Which is the odd one out? (a) a motion sensor (b) a servo motor (c) an LED (d) a small display
  22. 22.📶 How many states can a digital pin have? (a) one (b) a thousand (c) two (d) ten
  23. 23.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  24. 24.🔍 Which is the odd one out? (a) a temperature sensor (b) a speaker (c) a small display (d) a servo motor
  25. 25.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) a resistor (d) an input
  26. 26.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) a speaker (d) a sound sensor
  27. 27.💡 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
  28. 28.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  29. 29.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.💡 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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.📶 A pin set LOW gives about … (a) 0 V (b) 9 V (c) 5 V (d) 1.5 V
  33. 33.Which of these is an input? (a) a buzzer (b) a motor (c) a servo motor (d) a turning knob
  34. 34.💡 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
  35. 35.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  36. 36.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  37. 37.💡 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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.🔍 Which is the odd one out? (a) a small display (b) a water pump (c) a keypad (d) a motor
  39. 39.Which of these is an output? (a) a temperature sensor (b) a sound sensor (c) a keypad (d) a buzzer
  40. 40.📶 Digital or analog: a knob turned part way? (a) digital (b) analog

Answer key

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

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