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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 741 · 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 buzzer (b) a servo motor (c) a temperature sensor (d) a water pump
  2. 2.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  3. 3.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 0 V (d) 5 V
  4. 4.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  5. 5.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    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
  7. 7.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  8. 8.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  9. 9.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  10. 10.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  11. 11.Which of these is an output? (a) a speaker (b) a light sensor (c) a turning knob (d) a temperature sensor
  12. 12.🔍 Which is the odd one out? (a) a push button (b) a servo motor (c) a sound sensor (d) a turning knob
  13. 13.Which of these is an input? (a) a speaker (b) a motor (c) a turning knob (d) a servo motor
  14. 14.📶 Digital or analog: many values in a range? (a) analog (b) digital
  15. 15.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  16. 16.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 50 V (d) 0 V
  17. 17.💡 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 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  19. 19.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  20. 20.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  21. 21.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  22. 22.True or false: “the room temperature” is an analog signal. (a) True (b) False
  23. 23.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.💡 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 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.Which of these is an input? (a) a motion sensor (b) a servo motor (c) a buzzer (d) a motor
  27. 27.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  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 LOW
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.💡 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
  30. 30.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  31. 31.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  32. 32.💡 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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.💡 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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  36. 36.Which of these is an output? (a) a light sensor (b) a keypad (c) a sound sensor (d) a motor
  37. 37.📶 A pin that reads a push button is set as … (a) an input (b) a resistor (c) an output (d) a battery
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔍 Which is the odd one out? (a) a motor (b) a push button (c) a keypad (d) a temperature sensor
  40. 40.Which of these is an input? (a) an LED (b) a speaker (c) a motor (d) a push button

Answer key

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

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